bluuebunny/crossref_metadata_2025 huggingface dataset:
Implementation of Chromatic Super CAZ/AVI® medium for active surveillance of ceftazidime-avibactam resistance: preventing the loop from becoming a spiral
Authors: Bianco Gabriele , Boattini Matteo , Comini Sara , Leone Alessio , Bondi Alessandro , Zaccaria Teresa , Cavallo Rossana , Costa Cristina
Published: August 2022

Acquired resistance towards ceftazidime-avibactam (CAZ-AVI) is increasingly reported. Several mechanisms can be involved, but mutations in the Ω-loop region of β-lactamases are the most described. Herein, we assessed the implementation of Chromatic Super CAZ/AVI® medium in rectal swab surveillance cultures in a geographic area with endemic distribution of KPC-producing Klebsiella pneumoniae. Routine rectal swabs collected from the intensive care unit (ICU) and non-ICU patients were screened for carbapenemase-producing Enterobacterales (CPE), carbapenem-resistant Gram-negative organisms (CR-GN) and CAZ-AVI-resistant organisms by Chromatic CRE and Super CAZ/AVI® media. Among the 1839 patients screened, 146 (7.9%) were found to be colonized by one or more CPE and/or CR-GN isolates during hospitalization. Overall, among colonized patients the most common bacteria encountered were KPC-producing Enterobacterales (n = 60; 41.1%), carbapenem-resistant Pseudomonas aeruginosa (n = 41; 28.1%) and carbapenem-resistant A. baumannii (n = 34; 23.3%). Among patients colonized by KPC-producing Enterobacterales, thirty-five (58.3%) had CAZ-AVI-resistant strains. A 30.5% rate of faecal carriage of CAZ-AVI-resistant KPC-producing K. pneumoniae, substantially higher than that of susceptible isolates (2.8%), was observed in the COVID-19 ICU. Prevalence of faecal carriage of metallo-β-lactamase-producing organisms was low (0.5% and 0.2% for Enterobacterales and P. aeruginosa, respectively). Chromatic Super CAZ/AVI® medium showed 100% sensitivity in detecting CPE or CR-GN isolates resistant to CAZ-AVI regardless of both MIC values and carbapenemase content. Specificity was 86.8%. The Chromatic Super CAZ/AVI® medium might be implemented in rectal swab surveillance cultures for identification of patients carrying CAZ-AVI-resistant organisms to contain the spread of these difficult-to-treat pathogens.
High Friction Mechanism of ZDDP Tribofilm Based on in situ AFM Observation of Nano-Friction and Adhesion Properties
Authors: Sato Kaisei , Watanabe Seiya , Sasaki Shinya
Published: August 2022

Zinc dialkyl dithiophosphate (ZDDP) is a typical anti-wear additive that forms tribofilm on sliding surfaces and prevents adhesion wear but increases the friction force. In this study, the nano-friction and adhesion properties of ZDDP tribofilms were investigated by performing in situ observations by atomic force microscopy to explore the relationship between the formation process and physical properties of ZDDP tribofilm. The results showed that the nano-friction force increased with the formation of the ZDDP tribofilm. In addition, the adhesion force on the ZDDP tribofilm increased with the friction force. It was confirmed that the Young's modulus and nanoindentation hardness of the ZDDP tribofilms were lower than those of steel. However, the contact areas calculated using the Derjaguin–Muller–Toporov (DMT) contact theory were similar. In addition, the shear strengths calculated using the DMT model of the ZDDP tribofilm were substantially higher than those of steel.
Why Is It So Challenging to Measure Residual Stresses ?
Authors: Schajer G. S. , Prime M. B. , Withers P. J.
Published: August 2022

Background

Residual stresses have a “hidden” character because they exist in a material without the presence of any external loads. They cannot easily be added or subtracted in a quantified manner, as is done when measuring applied stresses, and so are much more challenging to measure.

Objective

The objective here is to identify and describe the various features that make residual stress measurement methods challenging and to consider the ways that these challenges can be addressed in practice.

Methods

Various of the most common residual stress measurements methods are considered and the challenges associated with them are identified and classified.

Results

Five major challenges for residual stress measurements, and the approaches used for their resolution, are identified.

Conclusions

Despite the various challenges that need to be overcome, residual stress measurements can be successfully undertaken in practice. The most significant feature for success is a highly skilled and knowledge practitioner.
Searching for constituents from plants in geographically characterized areas, Egypt, Madagascar, and Okinawa
Authors: Sugimoto Sachiko
Published: August 2022

Secondary metabolites may not be produced under some conditions, and in most cases, their function and significance in the producing organisms is unknown. Conversely, there are some that are produced for readily understood reasons, for example, toxic substances as defensive substances against invaders, or volatile substances that attract other species of organisms. These secondary metabolites also contribute to our health. However, there has not been sufficient research to evaluate them from a pharmacological perspective, and much progress is expected in this area in the future. About 90% of the existing plants have not been studied for their chemical components and biological activities (Kazuki Saito in Bunshun shinsho 1119, pp. 119–126. ISBN 978-4-16-661119-5, 2017). On this basis, we have been searching for the constituents of unknown plants, and whose constituents have not been studied extensively. In this paper, the authors have reviewed some of their previous searching for constituents from plants in geographically characterized areas, Egypt, Madagascar, and Okinawa.
PBX1-SIRT1 Positive Feedback Loop Attenuates ROS-Mediated HF-MSC Senescence and Apoptosis
Authors: Wang Yuan , Sui Yutong , Niu Ye , Liu Dan , Xu Qi , Liu Feilin , Zuo Kuiyang , Liu Mingsheng , Sun Wei , Wang Ziyu , Liu Zinan , Zou Fei , Shi Jiahong , Liu Xiaomei , Liu Jinyu
Published: August 2022

Stem cell senescence and depletion are major causes of aging and aging-related diseases. The NAD (Nicotinamide adenine dinucleotide) – SIRT1 (Silent Information Regulator 1) – PARP1 (Poly (ADP-ribose) polymerase-1) axis has gained interest owing to its significant role in regulating stem cell senescence and organismal aging. A recent study from our lab showed that pre-B-cell leukemia transcription factor1 (PBX1) overexpression attenuates hair follicle-derived mesenchymal stem cells (HF-MSCs) senescence and apoptosis by regulating ROS-mediated DNA damage via PARP1 downregulation; thus, suggesting that PARP1 downregulation is a common manifestation of the roles of both PBX1 and SIRT1 in HF-MSCs senescence attenuation, and implying a potential link between PBX1 and SIRT1. To this end, HF-MSCs overexpressing PBX1, overexpressing both PBX1 and PARP1, downregulating SIRT1, and overexpressing PBX1 as well as downregulating SIRT1 were generated, and senescence, apoptosis, DNA damage, and repair biomarkers were analyzed. Our results showed that (1) PBX1 overexpression alleviated HF-MSCs senescence and apoptosis accompanied by SIRT1 upregulation, PARP1 downregulation, and increased intracellular NAD and ATP levels. (2) SIRT1 knockdown enhanced cellular senescence and apoptosis, accompanied by increased ROS accumulation, DNA damage aggravation, and decreased intracellular NAD and ATP levels. (3) PBX1 overexpression rescued HF-MSCs senescence and apoptosis induced by SIRT1 knockdown. (4) PBX1 rescued PARP1 overexpression-mediated ATP and NAD depletion, accompanied by increased SIRT1 expression. Collectively, our results revealed that a positive interaction feedback loop exists between PBX1 and SIRT1. To the best of our knowledge we are the first to report that there is a PBX1-SIRT1-PARP1 axis that plays a critical role in alleviating HF-MSCs senescence and apoptosis. We provide a new perspective on the mechanisms underlying stem cell senescence as well as age-related disease prevention and treatment.

Graphical Abstract
Falsche Fragen, falsche Antworten
Authors: Herrmann Peter , Szynka Peter
Published: August 2022

Der Text leitet in den Schwerpunkt „Community Organizing“ ein, indem er den inhaltlichen Rahmen beschreibt und die Beiträge kurz vorstellt.
Association Between Circulating CD4+ T Cell Methylation Signatures of Network-Oriented SOCS3 Gene and Hemodynamics in Patients Suffering Pulmonary Arterial Hypertension
Authors: Benincasa Giuditta , Maron Bradley A. , Affinito Ornella , D’Alto Michele , Franzese Monica , Argiento Paola , Schiano Concetta , Romeo Emanuele , Bontempo Paola , Golino Paolo , Berrino Liberato , Loscalzo Joseph , Napoli Claudio
Published: August 2022

Pathogenic DNA methylation changes may be involved in pulmonary arterial hypertension (PAH) onset and its progression, but there is no data on potential associations with patient-derived hemodynamic parameters. The reduced representation bisulfite sequencing (RRBS) platform identified N = 631 differentially methylated CpG sites which annotated to N = 408 genes (DMGs) in circulating CD4+ T cells isolated from PAH patients vs. healthy controls (CTRLs). A promoter-restricted network analysis established the PAH subnetwork that included 5 hub DMGs (SOCS3, GNAS, ITGAL, NCOR2, NFIC) and 5 non-hub DMGs (NR4A2, GRM2, PGK1, STMN1, LIMS2). The functional analysis revealed that the SOCS3 gene was the most recurrent among the top ten significant pathways enriching the PAH subnetwork, including the growth hormone receptor and the interleukin-6 signaling. Correlation analysis showed that the promoter methylation levels of each network-oriented DMG were associated individually with hemodynamic parameters. In particular, SOCS3 hypomethylation was negatively associated with right atrial pressure (RAP) and positively associated with cardiac index (CI) (|r|≥ 0.6). A significant upregulation of the SOCS3, ITGAL, NFIC, NCOR2, and PGK1 mRNA levels (qRT-PCR) in peripheral blood mononuclear cells from PAH patients vs. CTRLs was found (P ≤ 0.05). By immunoblotting, a significant upregulation of the SOCS3 protein was confirmed in PAH patients vs. CTRLs (P < 0.01). This is the first network-oriented study which integrates circulating CD4+ T cell DNA methylation signatures, hemodynamic parameters, and validation experiments in PAH patients at first diagnosis or early follow-up. Our data suggests that SOCS3 gene might be involved in PAH pathogenesis and serve as potential prognostic biomarker.

Graphical abstract
Advancing the cybersecurity of the healthcare system with self-optimising and self-adaptative artificial intelligence (part 2)
Authors: Radanliev Petar , De Roure David
Published: August 2022

This article advances the knowledge on teaching and training new artificial intelligence algorithms, for securing, preparing, and adapting the healthcare system to cope with future pandemics. The core objective is to develop a concept healthcare system supported by autonomous artificial intelligence that can use edge health devices with real-time data. The article constructs two case scenarios for applying cybersecurity with autonomous artificial intelligence for (1) self-optimising predictive cyber risk analytics of failures in healthcare systems during a Disease X event (i.e., undefined future pandemic), and (2) self-adaptive forecasting of medical production and supply chain bottlenecks during future pandemics. To construct the two testing scenarios, the article uses the case of Covid-19 to synthesise data for the algorithms – i.e., for optimising and securing digital healthcare systems in anticipation of Disease X. The testing scenarios are built to tackle the logistical challenges and disruption of complex production and supply chains for vaccine distribution with optimisation algorithms.
Renoprotective activity of anethole- rich fraction from aromatic herbs on junk food induced diabetic nephropathy in rats
Authors: Vellapandian Chitra , R Rini , Ramachandram Dinesh Sangarran
Published: August 2022

Purpose

This study was carried out to study the effect of anethole rich fraction on the Diabetic Nephropathy (DN) rats, and explore the mechanisms.

Methods

Male wistar rats were grouped into 4 (n = 6 per group): Control, junk food fed DN induced rats, low dose and high dose groups. DN was induced by oral junk food feeding. They were monitored for blood glucose levels and urine protein content at regular intervals. At the end of the study, the biological and hematological parameters were measured. Pancreatic and kidney viscera were taken to observe histopathological changes.

Results

Both the doses of anethole rich fraction could drastically lower blood glucose levels, Low Density Lipoprotein (LDL), Glycated Serum Protein (GSP), Total Cholesterol (TC), Triglycerides (TG) (P < 0.01), Malondialdehyde (MDA) level (P < 0.01 or P < 0.05), increases insulin level (P < 0.01), High Density Lipoproteins (HDL), Glutathione Reductase (GSH) and Superoxide Dismutase (SOD) (P < 0.01 or P < 0.05 or P > 0.05). Both doses of anethole rich fraction also improved the pathological changes of kidney and pancreatic tissues in DN rats (P < 0.01 or P < 0.05 or P > 0.05).

Conclusions

Hence it can be hypothesized that the high dose of anethole rich fraction (100 mg/kg) could reach the intervention effect and could ameliorate renal damage in DN rats by improving the renal functions, oxidative stress levels, glycometabolism and pathological changes of pancreas and kidney.
Two remarks on Narkiewicz’s property (P)
Authors: Pottmeyer Lukas
Published: August 2022

Due to Narkiewicz a field F has property (P) if for no polynomial $$f\in F[x]$$

f
∈
F
[
x
]

of degree at least two there is an infinite f-invariant subset of F. We present a new example of an algebraic extension of $${\mathbb {Q}}$$
Q
satisfying (P). This is the first example in which we can find points of arbitrarily small positive Weil-height. Moreover, we study the possibility of property (P) for the field generated by all symmetric Galois extensions of $${\mathbb {Q}}$$
Q
. In particular we prove that there are no infinite backward orbits of non linear polynomials in this field.
Generic error bounds for the generalized Lasso with sub-exponential data
Authors: Genzel Martin , Kipp Christian
Published: August 2022

This work performs a non-asymptotic analysis of the generalized Lasso under the assumption of sub-exponential data. Our main results continue recent research on the benchmark case of (sub-)Gaussian sample distributions and thereby explore what conclusions are still valid when going beyond. While many statistical features remain unaffected (e.g., consistency and error decay rates), the key difference becomes manifested in how the complexity of the hypothesis set is measured. It turns out that the estimation error can be controlled by means of two complexity parameters that arise naturally from a generic-chaining-based proof strategy. The output model can be non-realizable, while the only requirement for the input vector is a generic concentration inequality of Bernstein-type, which can be implemented for a variety of sub-exponential distributions. This abstract approach allows us to reproduce, unify, and extend previously known guarantees for the generalized Lasso. In particular, we present applications to semi-parametric output models and phase retrieval via the lifted Lasso. Moreover, our findings are discussed in the context of sparse recovery and high-dimensional estimation problems.
Enrichment of bacteria involved in the nitrogen cycle and plant growth promotion in soil by sclerotia of rice sheath blight fungus
Authors: Mehmood Mirza Abid , Fu Yanping , Zhao Huizhang , Cheng Jiasen , Xie Jiatao , Jiang Daohong
Published: August 2022

Rice sheath blight pathogen, Rhizoctonia solani, produces numerous sclerotia to overwinter. As a rich source of nutrients in the soil, sclerotia may lead to the change of soil microbiota. For this purpose, we amended the sclerotia of R. solani in soil and analyzed the changes in bacterial microbiota within the soil at different time points. At the phyla level, Proteobacteria, Acidobacteria, Bacteroidetes, Actinobacteria, Chloroflexi and Firmicutes showed varied abundance in the amended soil samples compared to those in the control. An increased abundance of ammonia-oxidizing bacterium (AOB) Nitrosospira and Nitrite oxidizing bacteria (NOB) i.e., Nitrospira was observed, where the latter is reportedly involved in the nitrifier denitrification. Moreover, Thiobacillus, Gemmatimonas, Anaeromyxobacter and Geobacter, the vital players in denitrification, N2O reduction and reductive nitrogen transformation, respectively, depicted enhanced abundance in R. solani sclerotia-amended samples. Furthermore, asymbiotic nitrogen-fixing bacteria, notably, Azotobacter as well as Microvirga and Phenylobacterium with nitrogen-fixing potential also enriched in the amended samples compared to the control. Plant growth promoting bacteria, such as Kribbella, Chitinophaga and Flavisolibacter also enriched in the sclerotia-amended soil. As per our knowledge, this study is of its kind where pathogenic fungal sclerotia activated microbes with a potential role in N transformation and provided clues about the ecological functions of R. solani sclerotia on the stimulation of bacterial genera involved in different processes of N-cycle within the soil in the absence of host plants.
Religious Nationalism in Contemporary South Asia
Authors: Malji Andrea
Published: August 2022

This Element explores religious nationalism in Buddhism, Hinduism, Islam and Sikhism and how it manifests in India, Pakistan, and Sri Lanka. At the core, nationalists contend that the continuation of their group is threatened by some other group. Much of these fears are rooted in the colonial experience and have been exacerbated in the modern era. For the Hindu and Buddhist nationalists explored in this Element, the predominant source of fear is directed toward the Muslim minority and their secular allies. For Sikhs, minorities within India, the fear is primarily of the state. For Muslims in Pakistan, the fear is more dynamic and includes secularists and minority sects, including Shias and Ahmadis. In all instances, the groups fear that their ability to practice and express their religion is under immediate threat. Additionally, Hindu, Buddhist, and Muslim nationalists wish for the state to adopt or promote their religious ideology.
Lesions in White Matter in Wilson’s Disease and Correlation with Clinical Characteristics
Authors: Wang Anqin , Wei Taohua , Wu Hongli , Yang Yulong , Ding Yufeng , Wang Yi , Zhang Chuanfeng , Yang Wenming
Published: August 2022

Background:

Neuroimaging studies in Wilson’s disease (WD) have identified various alterations in white matter (WM) microstructural organization. However, it remains unclear whether these alterations are localized to specific regions of fiber tracts, and what diagnostic value they might have. The purpose of this study is to explore the spatial profile of WM abnormalities along defined fiber tracts in WD and its clinical relevance.

Methods:

Ninety-nine patients with WD (62 men and 37 women) and 91 age- and sex-matched controls (59 men and 32 women) were recruited to take part in experiments of diffusion-weighted imaging with 64 gradient vectors. The data were calculated by FMRIB Software Library (FSL) software and Automated Fiber Quantification (AFQ) software. After registration, patient groups and normal groups were compared by Mann–Whitney U test analysis.

Results:

Compared with the controls, the patients with WD showed widespread fractional anisotropy reduction and mean diffusivity, radial diffusivity elevation of identified fiber tracts. Significant correlations between diffusion tensor imaging (DTI) parameters and the neurological Unified Wilson’s Disease Rating Scale (UWDRS-N), serum ceruloplasmin, and 24-h urinary copper excretion were found.

Conclusions:

The present study has provided evidence that the metrics of DTI could be utilized as a potential biomarker of neuropathological symptoms in WD. Damage to the microstructure of callosum forceps and corticospinal tract may be involved in the pathophysiological process of neurological symptoms in WD patients, such as gait and balance disturbances, involuntary movements, dysphagia, and autonomic dysfunction.
Nonclassical Probability, Convex Hulls, and Dutch Books
Authors: Gil Sanchez Michał , Gyenis Zalán , Wroński Leszek
Published: August 2022

We report a solution to an open problem regarding the axiomatization of the convex hull of a type of nonclassical evaluations. We then investigate the meaning of this result for the larger context of the relation between rational credence functions and nonclassical probability. We claim that the notions of bets and Dutch Books typically employed in formal epistemology are of doubtful use outside the realm of classical logic, eventually proposing two novel ways of understanding Dutch Books in nonclassical settings.
Hegel and Formal Idealism
Authors: Oza Manish
Published: August 2022

I offer a new reconstruction of Hegel's criticism of Kant's idealism. Kant held that we impose categorial form on experience, while sensation provides its matter. Hegel argues that the matter we receive cannot guide our imposition of form on it. Contra recent interpretations, Hegel's argument does not depend on a conceptualist account of perception or a view of the categories as empirically conditioned. His objection is that, given Kant's dualistic metaphysics, the categories cannot have material conditions for correct application. This leads to subjectivism in the content of experience: the subject is given an implausibly strong role in determining what is the case. Hegel's own absolute idealism solves this problem.
IoT-enabled product development method to support rapid manufacturing using a nature-inspired algorithm
Authors: Chen Yu , Hao Shengbin , Nazif Habibeh
Published: August 2022

Investigations illustrate that the Internet of Things (IoT) can save costs, increase efficiency, improve quality, and provide data-driven preventative maintenance services. Intelligent sensors, dependable connectivity, and complete integration are essential for gathering real-time information. IoT develops home appliances for improved customer satisfaction, personalization, and enhanced big data analytics as a crucial Industry 4.0 enabler. Because the product design process is an important part of controlling manufacturing, there are constant attempts to improve and minimize product design time. Utilizing a hybrid algorithm, this research provides a novel method to schedule design products in production management systems to optimize energy usage and design time (combined particle optimization algorithm and shuffled frog leaping algorithm). The issue with particle optimization algorithms is that they might become stuck in local optimization and take a long time to converge to global optimization. The strength of the combined frog leaping algorithm local searching has been exploited to solve these difficulties. The MATLAB programming tool is used to simulate the suggested technique. The simulation findings were examined from three perspectives: energy usage, manufacturing time, and product design time. According to the findings, the recommended strategy performed better in minimizing energy use and product design time. These findings also suggest that the proposed strategy has a higher degree of convergence when discovering optimal solutions.
IDEAL OPERATORS AND HIGHER INDESCRIBABILITY
Authors: CODY BRENT , HOLY PETER
Published: August 2022

We investigate properties of the ineffability and the Ramsey operator, and a common generalization of those that was introduced by the second author, with respect to higher indescribability, as introduced by the first author. This extends earlier investigations on the ineffability operator by James Baumgartner, and on the Ramsey operator by Qi Feng, by Philip Welch et al., and by the first author.
Predictors of problematic adult alcohol, cannabis, and other substance use: A longitudinal study of two samples
Authors: Lansford Jennifer E. , Goulter Natalie , Godwin Jennifer , McMahon Robert J. , Dodge Kenneth A. , Crowley Max , Pettit Gregory S. , Bates John E. , Lochman John E.
Published: August 2022

This study examined whether a key set of adolescent and early adulthood risk factors predicts problematic alcohol, cannabis, and other substance use in established adulthood. Two independent samples from the Child Development Project (CDP; n = 585; 48% girls; 81% White, 17% Black, 2% other race/ethnicity) and Fast Track (FT; n = 463; 45% girls; 52% White, 43% Black, 5% other race/ethnicity) were recruited in childhood and followed through age 34 (CDP) or 32 (FT). Predictors of substance use were assessed in adolescence based on adolescent and parent reports and in early adulthood based on adult self-reports. Adults reported their own problematic substance use in established adulthood. In both samples, more risk factors from adolescence and early adulthood predicted problematic alcohol use in established adulthood (compared to problematic cannabis use and other substance use). Externalizing behaviors and prior substance use in early adulthood were consistent predictors of problematic alcohol and cannabis misuse in established adulthood across samples; other predictors were specific to the sample and type of substance misuse. Prevention efforts might benefit from tailoring to address risk factors for specific substances, but prioritizing prevention of externalizing behaviors holds promise for preventing both alcohol and cannabis misuse in established adulthood.
Jewish–Christian Religiosity: A Study in Twentieth-Century Central European History
Authors: Engel Amir
Published: August 2022

The article explores the interaction of the German, Jewish, and Christian traditions in the first part of the twentieth century in Central Europe to show three cases, in which these traditions merge into one. I name the result of this interaction “Jewish–Christian religiosity.” The name conveys a desire, common to the cases discussed, to overcome the traditional distinctions between Jews and Germans and Jews and Christians. It also conveys the belief that spirituality could bridge the gap between people and promote a more open society for all. All three cases expand notions first conceived by Romantic and idealist thinkers in order to facilitate interest in arcane Jewish sources like the Kabbalah and Hasidism. As the article suggests, eclectic worldviews like those discussed here may appear unfamiliar, but they continue intellectual and cultural trends that were discussed in the literature before.
A wideband metamaterial linear to linear conversion for X-band applications
Authors: Gupta Neelesh Kumar , Shukla Pavan Kumar , Pushpalata
Published: August 2022

This article presents wideband metamaterial cross-polarizer (MCP) structure for X-band applications. The proposed MCP consists of a splitted square-shaped resonating structure with two inner and one outer stub. It has an overall dimension of 8.6 mm × 8.6 mm. A wideband polarization conversion ratio (PCR) above 0.87 magnitude is achieved with a bandwidth of 3.49 GHz ranging from 8.8 to 12.29 GHz, which works for X (8–12 GHz) band. The PCR bandwidth of full width half maxima achieved is 4.55 GHz ranging from 8.5 to 13.05 GHz. Two distinct PCR peaks are observed at 9.44 and 11.47 GHz with PCR magnitude at 99.39 and 99.00% respectively. The normalized impedance and electromagnetic parameters (real and imaginary) curves proved the presence of metamaterial properties in the region of interest. Analysis of polarization conversion phenomena at two distinct frequencies is described with the help of electric field and current distribution. The structure is replicated using ANSYS HFSS 19.1 and measured inside anechoic chamber with the help of Vector Network Analyzer (VNA). The replicated and experimented responses obtained are almost similar to one another with adaptation due to fabrication liberality.
Modulation of the Predictability of the East Asian Summer Monsoon by the Interdecadal Pacific Oscillation
Authors: Zhang Yi , Wang Wei , Ding Ruiqiang , Li Jianping , Sun Cheng
Published: August 2022

We identified an interdecadal modulation of the potential predictability (measured by the signal‐to‐noise ratio) of the East Asian summer monsoon (EASM) by the interdecadal Pacific oscillation (IPO). The EASM potential predictability is relatively high during the warm phase of the IPO, but relatively low during the cold phase. The IPO has been in a cold phase since the late 1990s and this has coincided with a decrease in the potential predictability of the EASM, which has posed a severe challenge to the seasonal forecasting of the EASM in recent decades. The El Niño‐Southern Oscillation (ENSO)‐EASM relationship is stronger in the warm phase of the IPO than in the cold phase, resulting in an enhanced influence of the ENSO on the EASM and a stronger external signal of predictability for the EASM in the warm phase of the IPO. Changes in the ENSO‐EASM relationship can be attributed to a significant difference in the amplitude of the variability of the ENSO during the IPO cold and warm phase. The latter was found to have contributions from the modulation of the IPO on the El Niño and La Niña frequency asymmetry. These results imply that the phase of the IPO should be considered when assessing the prediction skill of the EASM.
Evaluation of Eddy Covariance Footprint Models Through the Artificial Line Source Emission of Methane
Authors: Liu Shuo , Liu Gang , Zhang Mi , Sun Yufang , Fang Shuangxi , Zhen Xiaojie , Feng Zhaozhong
Published: August 2022

This paper evaluates the performance of footprint models through a line source (LS) system releasing methane (CH4) measured by an eddy covariance (EC) system in a rice‐wheat rotation agro‐ecosystem. Two footprint models namely Kormann and Meixner (KM) and Flux Footprint Prediction (FFP), are used. The “line source width (LW)” was introduced, which could highly impact the model estimation, leading to an error of ∼500% for the FFP and ∼200% for the KM. The surface roughness length (z0) also affects the FFP estimation, which is much weaker than the effect of LW with a 15% error. An overestimation of 217.8% is observed when the LS is close to the EC system, which reduces to 12.2% when the source stays distant. The analysis of different experimental configurations illustrated that the estimated emission calculated based on footprint model improves with increasing emission height, averaging period, and emission rate. The most accurate estimations are achieved by the configurations of canopy level (CL; 5.5% overestimation), 15 min averaging period (1% underestimation), and moderate emission (ME; 1.9% underestimation), respectively. For KM, the CL‐ME‐30 min setup leads to the best performance, while SL (soil level)‐ME‐15 min is the best configuration for the FFP estimation. A multivariate regression model is proposed to provide preliminary guidance for the footprint model application. The designed LS system is valuable for validating the performance of flux measurements in the specific ecosystems (e.g., grassland, sand land, and forest) as well as other greenhouse gases (e.g., N2O and NH3).
How Wildfires Affect Snow in the American West
Authors: Sidik Saima
Published: August 2022

Data from 45 burned sites help researchers better understand climate change and wildfires’ impact on snowpack.
The Role of Mid‐latitude Westerly Jet in the Impacts of November Ural Blocking on Early‐Winter Warmer Arctic‐Colder Eurasia Pattern
Authors: Xu Xinping , He Shengping , Zhou Botao , Wang Huijun , Outten Stephen
Published: August 2022

Based on statistical analysis using observations and idealized model simulations, previous studies have revealed the potential response of early‐winter atmospheric circulation and temperature anomalies to November Ural blocking (UB) anomalies. Using a large number of coupled simulations, this study found that the response is sensitive to the intensity of November mid‐latitude westerly jet over Eurasia. Stronger‐than‐normal November UB without a significantly weakened westerly jet could not cause significant atmospheric response in early‐winter. By contrast, stronger‐than‐normal November UB with a significantly weakened jet would be followed by a warmer Arctic‐colder Eurasia (WACE) pattern in December. The significantly weakened westerly jet favors stronger upward propagation of planetary waves, which causes stronger weakening and longer persistence of the stratospheric polar vortex. This stratospheric response persists into December and propagates downward into the troposphere interfering with planetary waves (especially wavenumber‐1). The lead‐lag UB‐WACE linkage modulated by mid‐latitude jet may have implications for sub‐seasonal predictability.
Atmospheric Radiative and Oceanic Biological Productivity Responses to Increasing Anthropogenic Combustion‐Iron Emission in the 1850–2010 Period
Authors: Rathod S. D. , Hamilton D. S. , Li L. , Mahowald N. M. , Matsui H. , Pierce J. R. , Bond T. C.
Published: August 2022

Anthropogenic emission is an important component of the present‐day iron cycle yet its long‐term impacts on climate are poorly understood. Iron mineralogy strongly affects its radiative and oceanic interactions and was unrepresented in previous studies. We perform simulations using a mineralogy‐based inventory and an atmospheric transport model and estimate the 1850–2010 global mean direct radiative forcing (DRF) to be +0.02 to +0.10 W/m2. We estimate that the CO2 sequestration of 0.2–13 ppmv over the last 150 years due to enhanced phytoplankton productivity by anthropogenic iron deposition causes an avoided CO2 forcing of −0.002 to −0.16 W/m2. While globally small, these impacts can be higher in specific regions; the anthropogenic DRF is +0.5 W/m2 over areas with more coal combustion and metal smelting, and anthropogenic soluble iron sustains >10% of marine net primary productivity in the high‐latitude North Pacific Ocean, a region vulnerable to stratification due to climate change.
Elastic Anomalies Across the α‐β Phase Transition in Orthopyroxene: Implication for the Metastable Wedge in the Cold Subduction Slab
Authors: Li Luo , Sun Ningyu , Shi Weigang , Mao Zhu , Yu Yingxin , Zhang Yanyao , Lin Jung‐Fu
Published: August 2022

Single‐crystal elasticity of both α‐ and β‐orthopyroxene was determined up to 20 GPa and 300 K by Brillouin scattering. Using the derived full elastic moduli (Cij), we investigated the contribution of the metastable pyroxene to the seismically observed 3%–5% low‐velocity anomalies along the subducting slab in the top transition zone. Our modeled results show that a harzburgite wedge with a 1000‐K colder geotherm and metastable α‐orthopyroxene and olivine displays compressional (VP) and shear‐wave (VS) velocities 3.0%–3.6(6)% and 2.0%–2.8(6)% lower than the surrounding mantle at 410–460 km depth, respectively. At deeper depth up to 520 km, VP and VS of this metastable wedge with β‐orthopyroxene and olivine are 3.6%–4.4(6)% and 2.8%–4.3(6)% lower than the pyrolitic mantle, respectively. The presence of both metastable orthopyroxene and olivine instead of metastable olivine alone helps better explain the origin of the low‐velocity anomalies within the subduction slab in the top transition zone.
Three‐Dimensional Measurements of Air Entrainment and Enhanced Bubble Transport During Wave Breaking
Authors: Ruth Daniel J. , Néel Baptiste , Erinin Martin A. , Mazzatenta Megan , Jaquette Robert , Veron Fabrice , Deike Luc
Published: August 2022

We experimentally investigate the depth distributions and dynamics of air bubbles entrained by breaking waves in a wind‐wave channel over a range of breaking wave conditions using high‐resolution imaging and three‐dimensional bubble tracking. Below the wave troughs, the bubble concentration decays exponentially with depth. Patches of entrained bubbles are identified for each breaking wave, and statistics describing the horizontal and vertical transport are presented. Aggregating our results, we find a stream‐wise transport faster than the associated Stokes drift and modified Stokes drift for buoyant particles, which is an effect not accounted for in current models of bubble transport. This enhancement in transport is attributed to the flow field induced by the breaking waves and is relevant for the transport of bubbles, oil droplets, and microplastics at the ocean surface.
Seismic Evidence for Crustal Modification Across the Tanlu Fault Zone in Eastern China
Authors: Lü Ziqiang , Lei Jianshe
Published: August 2022

The continental collision and subduction between the North China Craton and Yangtze Plate resulted in complex multistage tectonic episodes of the Tanlu fault zone. To adequately understand the geodynamic processes of the continental collision, we construct a high‐resolution shear‐wave velocity model of the crust and uppermost mantle using full‐wave ambient noise tomographic method based on a new broadband dense seismic array across the Tanlu fault zone. Our tomographic model reveals the uniquely alternating high‐velocity and low‐velocity anomalies from the lower crust to uppermost mantle across the Tanlu fault zone, which may result from the vertical slab tear of the subducted Yangtze Plate and the subsequent upwelling of hot asthenospheric materials. A prominent mid‐crustal detachment zone is observed along the Tanlu fault zone, which provides direct seismic evidence for the Tanlu fault zone that occurred strongly left‐lateral shearing deformation and may influence the uneven distribution of the strong earthquakes.
“Double Door” Opening of the Japan Sea Inferred by Pn Attenuation Tomography
Authors: Yang Geng , Zhao Lian‐Feng , Xie Xiao‐Bi , He Xi , Lü Yan , Yao Zhen‐Xing
Published: August 2022

The extension of back‐arc basins and formation of marginal seas following the subduction of oceanic lithosphere are usually attributed to the rollback of subducting slabs and distorted mantle convection. However, for the Japan Sea, the largest marginal sea in the northwestern Pacific, its opening is unlikely only resulted from the subduction of the Pacific plate because of the coeval Philippine plate subduction and the arcuate arc volcanic zone. Therefore, the present‐day thermal structure in the uppermost mantle, which can be directly constrained by strong Pn‐wave attenuation, plays a vital role in understanding the Japan Sea opening. Here, we observe two belts of strong Pn attenuation beneath the Japan Sea; their strikes are generally consistent with local Pn anisotropy and the retreat directions of the Pacific and Philippine trenches. Hence, there seem to be two divergent mantle flows in the uppermost mantle, pushing a “double door” for the Japan Sea opening.
Wake Vortices and Dissipation in a Tidally Modulated Flow Past a Three‐Dimensional Topography
Authors: Puthan Pranav , Pawlak Geno , Sarkar Sutanu
Published: August 2022

Large eddy simulations are employed to investigate the role of tidal modulation strength on wake vortices and dissipation in flow past three‐dimensional topography, specifically a conical abyssal hill. The barotropic current is of the form Uc + Ut sin(Ωtt), where Uc and Ut are the mean and oscillatory components, respectively, and Ωt is the tidal frequency. A regime with strong stratification and weak rotation is considered. The velocity ratio R = Ut/Uc is varied from 0 to 1. Simulation results show that the frequency of wake vortices reduces gradually with increasing R from its natural shedding frequency at R = 0 to Ωt/2 when R ≥ 0.2. The ratio of R and the excursion number, denoted as , controls the shift in the vortex frequency. When , vortices are trapped in the wake during tidal deceleration, extending the vortex shedding cycle to two tidal cycles. Elevated dissipation rates in the obstacle lee are observed in the lateral shear layer, hydraulic jet, and the near wake. The regions of strong dissipation are spatially intermittent, with values exceeding during the maximum‐velocity phase, where D is the base diameter of the hill. The maximum dissipation rate during the tidal cycle increases monotonically with R in the downstream wake. Additionally, the normalized area‐integrated dissipation rate in the hydraulic response region scales with R as (1 + R)4. Results show that the wake dissipation energetically dominates the internal wave flux in this class of low‐Froude number geophysical flows.
Estimation of the Global Distribution of Phytoplankton Light Absorption From Pigment Concentrations
Authors: Soja‐Woźniak Monika , Clementson Lesley , Wojtasiewicz Bożena , Baird Mark
Published: August 2022

Light absorption by phytoplankton drives marine primary production and determines ocean color. Phytoplankton absorption is a function of the pigment composition, wavelength, intracellular pigment concentration, and the cells' type. This paper presents phytoplankton absorption spectra reconstructed from in situ pigment concentration and a library of pigment‐specific absorption coefficients from 32 individual pigment standards, including chlorophylls, caretonoids and phycobilins. The samples dominated by small phytoplankton show no significant difference between calculated absorption and that measured by a spectrophotometer. The component of absorption due to large cells, determined by diagnostic pigments analysis, required correction for the package effect. For the global ocean, the reconstructed phytoplankton absorption was overestimated by 16% at 443 nm and underestimated by 13% over the range between 400 and 700 nm. Following our reconstruction protocol, this approach allows the estimation of phytoplankton absorption spectra from many locations where pigment concentration has been measured, but no directly observed phytoplankton absorption measurements are available.
Dissolved Methane in the World's Largest Semi‐Enclosed Estuarine System: The Estuary and Gulf of St. Lawrence (Canada)
Authors: Li Y. , Xie H. , Scarratt M. G. , Damm E. , Galbraith P. S. , Lambert N. , Geng L. , Wallace D. W. R.
Published: August 2022

We report the first water‐column dissolved methane data set from the Estuary and Gulf of St. Lawrence (EGSL). Per surface‐water methane concentration and sea‐to‐air flux, the upper estuary behaved like a typical shallow macrotidal estuary, while the lower estuary and the gulf resembled outer shelf seas and ocean slopes, respectively. The EGSL emitted 166.3 (71.5–214.4) × 106 mol CH4 year−1 to the atmosphere, representing 0.3% (0.1%–0.4%) of the total emission from global estuarine environments. A net production of 11.7 × 107 mol CH4 year−1 was required to sustain this emission. Methane distributions in the upper estuary were dominated by physical mixing, while those in the lower estuary and the gulf bore characteristic subsurface maxima and deep minima shedding light on the methane consumption and production pathways. Elevated but highly variable near‐bottom methane concentrations (10.4–695.3 nmol L−1) transpired over pockmarks on the seabed of the lower estuary, inferring an upward diffusive flux of up to ∼700 mmol CH4 m2 d−1. Hypoxia in the lower estuary bottom water had little influence on methane concentrations. Lab incubations yielded methane cycling rates from a net production of 0.0068 nmol L−1 d−1 to net consumption with turnover times of 33.3–263 days. Methane in the EGSL was isotopically enriched with 13C (δ13CCH4: −40.9‰ to −27.4‰ relative to Peedee Belemnite). This study reveals that the EGSL is a smaller proportional contributor to methane emission from estuarine environments and that complex physical‐biogeochemical interactions control methane cycling and isotopic composition in this vast estuarine system.
Effects of Fire Diurnal Variation and Plume Rise on U.S. Air Quality During FIREX‐AQ and WE‐CAN Based on the Multi‐Scale Infrastructure for Chemistry and Aerosols (MUSICAv0)
Authors: Tang Wenfu , Emmons Louisa K. , Buchholz Rebecca R. , Wiedinmyer Christine , Schwantes Rebecca H. , He Cenlin , Kumar Rajesh , Pfister Gabriele G. , Worden Helen M. , Hornbrook Rebecca S. , Apel Eric C. , Tilmes Simone , Gaubert Benjamin , Martinez‐Alonso Sara‐Eva , Lacey Forrest , Holmes Christopher D. , Diskin Glenn S. , Bourgeois Ilann , Peischl Jeff , Ryerson Thomas B. , Hair Johnathan W. , Weinheimer Andrew J. , Montzka Denise D. , Tyndall Geoffrey S. , Campos Teresa L.
Published: August 2022

We analyze the effects of the diurnal cycle of fire emissions (DCFE) and plume rise on U.S. air quality using the MUSICAv0 (Multi‐Scale Infrastructure for Chemistry and Aerosols Version 0) model during the FIREX‐AQ (Fire Influence on Regional to Global Environments and Air Quality) and WE‐CAN (Western wildfire Experiment for Cloud chemistry, Aerosol absorption and Nitrogen) field campaigns. To include DCFE in the model, we employ two approaches: a DCFE climatology and DCFE derived from a satellite fire radiative power product. We also implemented two sets of plume‐rise climatologies, and two plume‐rise parameterizations. We evaluate the model performance with airborne measurements, U.S. EPA Air Quality System surface measurements, and satellite products. Overall, including plume rise improves model agreement with observations such as aircraft observations of CO and NOx for FIREX‐AQ and WE‐CAN. Applying DCFE also improves model performance, such as for surface PM2.5 in fire‐impacted regions. The impact of plume rise is larger than the impact of DCFE. Plume rise can greatly enhance modeled long‐range transport of fire‐emitted pollutants. The simulations with plume‐rise parameterizations generally perform better than the simulations with plume‐rise climatologies during FIREX‐AQ, but not for WE‐CAN. The 2019 Williams Flats Fire case study demonstrates that DCFE and plume rise change fire impacts because fire emissions are subject to different meteorology and chemistry when emitted at different times of a day and altitudes. Moreover, DCFE and plume rise also impact local‐to‐regional meteorology and chemical reaction rates. DCFE and plume rise will be included in future MUSICA versions.
Water Vapor Flux‐Profile Relationship in the Stable Boundary Layer Over the Sea Surface
Authors: Ma Yubin , Cheng Xueling , Li Qilong , Wu Lin , Zeng Qingcun , Jin Jiangbo , Shao Shiyong , Li Junmin , Han Chenghui
Published: August 2022

Comprehensive marine atmospheric turbulence observation data, meteorological sounding and sea surface conditions in the South China Sea were employed to analyze and parameterize the vapor profile in the stable marine atmospheric boundary layer. The observations involved a three‐dimensional ultrasonic anemometer, water vapor carbon dioxide analyzer, radiosonde, and buoy. This paper theoretically determined that the water vapor profile function φq differs from the temperature profile function φh and that φq should be independently parameterized. A linear relationship existed between the dimensionless water vapor gradient and stability parameters based on the observation results, and φq was then obtained as φq(z/L) = az/L + b, in which the stability covered the stability range (z/L > 1). This result was applied in the Tropical Ocean‐Global Atmosphere Coupled‐Ocean Atmosphere Response Experiment bulk flux algorithm, and the simulation of the latent heat flux was improved.