bluuebunny/crossref_metadata_2025_split huggingface dataset:
Controls of Quasi-Linear Convective System Tornado Intensity
Authors: Marion Geoffrey R. , Trapp Robert J. 
Published: January 2021

AbstractAlthough tornadoes produced by quasi-linear convective systems (QLCSs) generally are weak and short lived, they have high societal impact due to their proclivity to develop over short time scales, within the cool season, and during nighttime hours. Precisely why they are weak and short lived is not well understood, although recent work suggests that QLCS updraft width may act as a limitation to tornado intensity. Herein, idealized simulations of tornadic QLCSs are performed with variations in hodograph shape and length as well as initiation mechanism to determine the controls of tornado intensity. Generally, the addition of hodograph curvature in these experiments results in stronger, longer-lived tornadic-like vortices (TLVs). A strong correlation between low-level mesocyclone width and TLV intensity is identified (R2 = 0.61), with a weaker correlation in the low-level updraft intensity (R2 = 0.41). The tilt and depth of the updraft are found to have little correlation to tornado intensity. Comparing QLCS and isolated supercell updrafts within these simulations, the QLCS updrafts are less persistent, with the standard deviations of low-level vertical velocity and updraft helicity approximately 48% and 117% greater, respectively. A forcing decomposition reveals that the QLCS cold pool plays a direct role in the development of the low-level updraft, providing the benefit of additional forcing for ascent while also having potentially deleterious effects on both the low-level updraft and near-surface rotation. The negative impact of the cold pool ultimately serves to limit the persistence of rotating updraft cores within the QLCS.
Impacts of Varying Concentrations of Cloud Condensation Nuclei on Deep Convective Cloud Updrafts—A Multimodel Assessment
Authors: Marinescu Peter J. , van den Heever Susan C. , Heikenfeld Max , Barrett Andrew I. , Barthlott Christian , Hoose Corinna , Fan Jiwen , Fridlind Ann M. , Matsui Toshi , Miltenberger Annette K. , Stier Philip , Vie Benoit , White Bethan A. , Zhang Yuwei 
Published: January 2021

AbstractThis study presents results from a model intercomparison project, focusing on the range of responses in deep convective cloud updrafts to varying cloud condensation nuclei (CCN) concentrations among seven state-of-the-art cloud-resolving models. Simulations of scattered convective clouds near Houston, Texas, are conducted, after being initialized with both relatively low and high CCN concentrations. Deep convective updrafts are identified, and trends in the updraft intensity and frequency are assessed. The factors contributing to the vertical velocity tendencies are examined to identify the physical processes associated with the CCN-induced updraft changes. The models show several consistent trends. In general, the changes between the High-CCN and Low-CCN simulations in updraft magnitudes throughout the depth of the troposphere are within 15% for all of the models. All models produce stronger (~+5%–15%) mean updrafts from ~4–7 km above ground level (AGL) in the High-CCN simulations, followed by a waning response up to ~8 km AGL in most of the models. Thermal buoyancy was more sensitive than condensate loading to varying CCN concentrations in most of the models and more impactful in the mean updraft responses. However, there are also differences between the models. The change in the amount of deep convective updrafts varies significantly. Furthermore, approximately half the models demonstrate neutral-to-weaker (~−5% to 0%) updrafts above ~8 km AGL, while the other models show stronger (~+10%) updrafts in the High-CCN simulations. The combination of the CCN-induced impacts on the buoyancy and vertical perturbation pressure gradient terms better explains these middle- and upper-tropospheric updraft trends than the buoyancy terms alone.
Arctic Amplification of Anthropogenic Forcing: A Vector Autoregressive Analysis
Authors: Coulombe Philippe Goulet , Göbel Maximilian 
Published: January 2021

AbstractOn September 15th 2020, Arctic sea ice extent (SIE) ranked second-to-lowest in history and keeps trending downward. The understanding of how feedback loops amplify the effects of external CO2 forcing is still limited. We propose the VARCTIC, which is a Vector Autoregression (VAR) designed to capture and extrapolate Arctic feedback loops. VARs are dynamic simultaneous systems of equations, routinely estimated to predict and understand the interactions of multiple macroeconomic time series. The VARCTIC is a parsimonious compromise between full-blown climate models and purely statistical approaches that usually offer little explanation of the underlying mechanism. Our completely unconditional forecast has SIE hitting 0 in September by the 2060’s. Impulse response functions reveal that anthropogenic CO2 emission shocks have an unusually durable effect on SIE – a property shared by no other shock. We find Albedo- and Thickness-based feedbacks to be the main amplification channels through which CO2 anomalies impact SIE in the short/medium run. Furthermore, conditional forecast analyses reveal that the future path of SIE crucially depends on the evolution of CO2 emissions, with outcomes ranging from recovering SIE to it reaching 0 in the 2050’s. Finally, Albedo and Thickness feedbacks are shown to play an important role in accelerating the speed at which predicted SIE is heading towards 0.
Transient Extratropical Response to Solar Ultraviolet Radiation in the Northern Hemisphere Winter
Authors: Givon Yonatan , Garfinkel Chaim I. , White Ian 
Published: January 2021

AbstractAn intermediate complexity general circulation model is used to investigate the transient response of the NH winter stratosphere to modulated ultraviolet (UV) radiation by imposing a stepwise, deliberately exaggerated UV perturbation and analyzing the lagged response. Enhanced UV radiation is accompanied by an immediate warming of the tropical upper stratosphere. The warming then spreads into the winter subtropics due to an accelerated Brewer–Dobson circulation in the tropical upper stratosphere. The poleward meridional velocity in the subtropics leads to an increase in zonal wind in midlatitudes between 20° and 50°N due to Coriolis torque. The increase in midlatitude zonal wind is accompanied by a dipole in Eliassen–Palm flux convergence, with decreased convergence near the winter pole and increased convergence in midlatitudes (where winds are strengthening due to the Coriolis torque); this dipole subsequently extends the anomalous westerlies to subpolar latitudes within the first 10 days. The initial radiatively driven acceleration of the Brewer–Dobson circulation due to enhanced shortwave absorption is replaced in the subpolar winter stratosphere by a wave-driven deceleration of the Brewer–Dobson circulation, and after a month the wave-driven deceleration of the Brewer–Dobson circulation encompasses most of the winter stratosphere. Approximately a month after UV is first modified, a significant poleward jet shift is evident in the troposphere. The results of this study may have implications for the observed stratospheric and tropospheric responses to solar variability associated with the 27-day solar rotation period, and also to solar variability on longer time scales.
Quantitative Analysis of the Performance of Spatial Interpolation Methods for Rainfall Estimation Using Commercial Microwave Links
Authors: Eshel Adam , Messer Hagit , Kunstmann Harald , Alpert Pinhas , Chwala Christian 
Published: January 2021

AbstractUsing signal level measurements from commercial microwave links (CMLs) has proven to be a valuable tool for near-ground 2D rain mapping. Such mapping is commonly based on spatial interpolation methods, where each CML is considered as a point measurement instrument located at its center. The validity of the resulted maps is tested against radar observations. However, since radar has limitations, accuracy of CML-based reconstructed rain maps remains unclear. Here we provide a quantitative comparison of the performance of CML-based spatial interpolation methods for rain mapping by conducting a systematic analysis: first by quantifying the performance of maps generated from semisynthetic CML data, and thereafter turning to real-data analysis of the same rain events. A radar product of the German Weather Service serves as ground truth for generating semisynthetic data, in which several temporal aggregations of the radar rainfall fields are used to create different decorrelation distances. The study was done over an area of 225 × 245 km2 in southern Germany, with 808 CMLs. We compare the performance of two spatial interpolation methods—inverse distance weighting and ordinary kriging—in two cases: where each CML is represented as a single point, and where three points are used. The points’ measurements values in the latter are determined using an iterative algorithm. The analysis of both cases is based on a 48-h rain event. The results reconfirm the validity of CML-based rain retrieval, showing a slight systematic performance improvement when an iterative algorithm is applied so each CML is represented by more than a single point, independent of the interpolation method.
Evaluation of Microphysics Schemes in Tropical Cyclones Using Polarimetric Radar Observations: Convective Precipitation in an Outer Rainband
Authors: Wu Dan , Zhang Fuqing , Chen Xiaomin , Ryzhkov Alexander , Zhao Kun , Kumjian Matthew R. , Chen Xingchao , Chan Pak-Wai 
Published: January 2021

AbstractCloud microphysics significantly impact tropical cyclone precipitation. A prior polarimetric radar observational study by the authors revealed the ice-phase microphysical processes as the dominant microphysics mechanisms responsible for the heavy precipitation in the outer rainband of Typhoon Nida (2016). To assess the model performance regarding microphysics, three double-moment microphysics schemes (i.e., Thompson, Morrison, and WDM6) are evaluated by performing a set of simulations of the same case. While these simulations capture the outer rainband’s general structure, microphysics in the outer rainbands are strikingly different from the observations. This discrepancy is primarily attributed to different microphysics parameterizations in these schemes, rather than the differences in large-scale environments due to cloud–environment interactions. An interesting finding in this study is that the surface rain rate or liquid water content is inversely proportional to the simulated mean raindrop sizes. The mass-weighted raindrop diameters are overestimated in the Morrison and Thompson schemes and underestimated in the WDM6 scheme, while the former two schemes produce lower liquid water content than WDM6. Compared with the observed ice water content based on a new polarimetric radar retrieval method, the ice water content above the environmental 0°C level in all simulations is highly underestimated, especially at heights above 12 km MSL where large concentrations of small ice particles are typically prevalent. This finding suggests that the improper treatment of ice-phase processes is potentially an important error source in these microphysics schemes. Another error source identified in the WDM6 scheme is overactive warm-rain processes that produce excessive concentrations of smaller raindrops.
Acoustic Reflexes in Aural Atresia Patients: Evidence of an Intact Efferent System?
Authors: Casazza Geoffrey C. , Gray Lincoln C. , Hildebrand Debra , Kesser Bradley W. 
Published: January 2021

Objective: To record crossed acoustic reflex thresholds (xART’s) postoperatively from patients after surgical repair of unilateral congenital aural atresia (CAA). To seek explanations for when xARTs can and cannot be recorded. We hope to understand the implications for this central auditory reflex despite early afferent deprivation. Methods: Patients who underwent surgery to correct unilateral CAA at a tertiary academic medical were prospectively enrolled to evaluate for the presence of xART. Preoperative ARTs in the normal (non-atretic) ear, and postoperative ipsilateral ARTs (stimulus in the normal ear) and contralateral ARTs (stimulus in the newly reconstructed atretic ear; record in the normal ear) were measured at 500, 1000, and 2000 Hz. Results: Four of 11 patients with normal ipsilateral reflex thresholds preoperatively demonstrated crossed acoustic reflexes postoperatively (stimulus in reconstructed ear; record from normal ear). Four other patients demonstrated normal ipsilateral thresholds preoperatively but did not have crossed reflexes postoperatively. No reflexes (pre- or postoperatively) could be recorded in 3 patients. Crossed reflex threshold is significantly correlated with the postoperative audiometric threshold. There was no correlation between ipsilateral and contralateral reflex thresholds. Conclusion: Crossed acoustic reflexes can be recorded from some but not all postoperative atresia patients, and the thresholds for those reflexes correlate with the postoperative pure tone threshold. The presence of acoustic reflexes implies an intact CN VIII-to-opposite CN VII central reflex arc despite early unilateral sound deprivation.
A Comprehensive Evaluation of Spine Kinematics, Kinetics, and Trunk Muscle Activities During Fatigue-Induced Repetitive Lifting
Authors: Kazemi Zeinab , Mazloumi Adel , Arjmand Navid , Keihani Ahmadreza , Karimi Zanyar , Ghasemi Mohamad Sadegh , Kordi Ramin 
Published: January 2021

Objective Spine kinematics, kinetics, and trunk muscle activities were evaluated during different stages of a fatigue-induced symmetric lifting task over time. Background Due to neuromuscular adaptations, postural behaviors of workers during lifting tasks are affected by fatigue. Comprehensive aspects of these adaptations remain to be investigated. Method Eighteen volunteers repeatedly lifted a box until perceived exhaustion. Body center of mass (CoM), trunk and box kinematics, and feet center of pressure (CoP) were estimated by a motion capture system and force-plate. Electromyographic (EMG) signals of trunk/abdominal muscles were assessed using linear and nonlinear approaches. The L5-S1 compressive force (Fc) was predicted via a biomechanical model. A two-way multivariate analysis of variance (MANOVA) was performed to examine the effects of five blocks of lifting cycle (C1 to C5) and lifting trial (T1 to T5), as independent variables, on kinematic, kinetic, and EMG-related measures. Results Significant effects of lifting trial blocks were found for CoM and CoP shift in the anterior–posterior direction (respectively p < .001 and p = .014), trunk angle ( p = .004), vertical box displacement ( p < .001), and Fc ( p = .005). EMG parameters indicated muscular fatigue with the extent of changes being muscle-specific. Conclusion Results emphasized variations in most kinematics/kinetics, and EMG-based indices, which further provided insight into the lifting behavior adaptations under dynamic fatiguing conditions. Application Movement and muscle-related variables, to a large extent, determine the magnitude of spinal loading, which is associated with low back pain.
The level of formal support received by people with severe mental illness living in supported accommodation and participation: A systematic review
Authors: Jose Akkara Lionel , Harrison Michele , Roy Anusua Singh , Fitzpatrick Linda Irvine- , Forsyth Kirsty 
Published: January 2021

Aim: The review aimed to identify and explore the association of level of support received by people with severe mental illness in supported accommodation and participation. Method: The authors conducted a systematic search in MEDLINE, PsychINFO, PsychARTICLES, CINAHL Plus and ASSIA. Searches were restricted to articles published in English and participants aged 18 years and over with severe mental illness. Articles were included based on level of support received in mental health supported accommodation, classified according to the Simple Taxonomy for Supported Accommodation, and three factors of participation: social participation, daily living functioning and personal empowerment. Studies of in-patient settings and nursing homes were excluded. The review protocol is registered on PROSPERO (registration number: CRD42019161808). Results: Six articles were included in the review from USA, Australia, Sweden and Taiwan. Factors of participation for people living in accommodation with moderate support and accommodation with high support were explored. Data indicated an association between level of support and participation showing that people living in accommodation with moderate support had increased participation compared to people living in accommodation with high support. Conclusion: This review identified an association between level of formal support and participation. People with SMI living in accommodation with medium support participated in more community occupations, more activities and had a higher level of personal empowerment than people living in accommodation with high support.
Seeking opportunities from crisis? China’s governance responses to the COVID-19 pandemic
Authors: Jing Yijia 
Published: January 2021

The COVID-19 pandemic has imposed a challenge to state capacities on all countries of the world and a genuine test of their abilities of opportunity management. In comparison, China has managed to promptly get the pandemic under effective control and firmly enhanced domestic support for the government. This article argues that China’s successful opportunity management was firmly shaped by its institutional settings, governing structures, and actor strategies. While the noncompetitive regime, unitary government, performance legitimacy, and high citizen trust afforded strong political commitment, China’s crisis management experiences and capacities facilitated quick and effective coordination. Further, top leaders made use of the crisis to demonstrate accountable leadership and push forward a grand reform agenda. The nature and functioning of these pro-success factors are inherently rooted in the unique Chinese context. Points for practitioners This study shows a successful story of opportunity management in crises in the Chinese context under the COVID-19 pandemic scenario. Political leaders and public managers should enable systematic and prompt governance responses to such major challenges by building up a broad political consensus and coordinating evidence-based emergency responses. The study shows that clear accountability in crises is a major factor determining the capability of a system to take decisive actions and should be seriously reconstructed by countries struck by the pandemic.
Price structures for electricity supply and potential consequences for building services systems
Authors: Hitchin Roger 
Published: January 2021

Policies to reduce carbon emissions are leading to substantial changes in the demand for electricity and to the structure of electricity supply systems, which will alter the cost structure of electricity supply. This can be expected to result in corresponding changes to the price structure faced by customers. This note is an initial exploration of how possible new price structures may impact on HVAC system and building design and use. Changes in the price structure of electricity supply (separately from changes in price levels) can significantly affect the cost-effective design and operation of building services systems; especially of heating and cooling systems. The nature and implications of these changes can have important implications for future system design and operation.
Outcomes of Septal Perforation Repair With Concurrent Endoscopic Sinus Surgery
Authors: Abdel‐Aty Yassmeen , Cain Rachel B. , Taylor Cullen , Marino Michael J. , Lal Devyani , Bansberg Stephen F. 
Published: January 2021

ObjectiveThis study reviews a cohort of patients in whom septal perforation repair was performed concurrently with endoscopic sinus surgery. We present an endonasal perforation repair technique using bilateral mucosal flaps with an autogenous interposition graft. Intraoperative and postoperative management of the combined surgical patient is discussed and perforation closure outcomes are reported.Study DesignCase series.SettingTertiary care center.MethodsIn this institutional review board–approved retrospective chart review, adult patients who underwent concurrent bilateral mucosal flap septal perforation repair and endoscopic sinus surgery from March 1992 to March 2020 were identified. Data on demographics, clinical presentations, perforation size, surgical techniques, and outcomes were extracted and analyzed for patients with a minimum of 3 months of follow‐up.ResultsFifty‐six patients met study inclusion criteria. Nasal obstruction/congestion was the most frequent symptom reported (80.4%), followed by crusting and epistaxis. Mean perforation size measured at the time of surgery was 14.7 (range, 3‐41) mm in length by 9.3 (range, 2‐23) mm in height. Temporalis fascia was the most frequent (57.9%) interposition graft material used. Complete perforation closure at the time of the last follow‐up was noted in 51 (91.1%) patients. Only 1 failure was noted in the last 48 attempted repairs.ConclusionPatients with a perforated septum may have coexistent chronic sinusitis. The feasibility of attempting concurrent sinus surgery and perforation repair has been questioned. Our review demonstrates a high perforation closure rate when a bilateral mucosal flap procedure is performed after sinus surgery is performed at the same setting.
Legacy perceptions and interventions for adults and children receiving palliative care: A systematic review
Authors: Boles Jessika C , Jones Maile T 
Published: January 2021

Background: Legacy has been invoked as a means for strengthening human attachments, continuing bonds, and ensuring that individuals will be remembered; however, little is known about the spectrum of approaches to, outcomes associated with, and best practices for legacy interventions. Aim: To systematically review research on legacy perceptions and interventions in pediatric and adult palliative care recipients. Design: A systematic mixed studies review synthesizing quantitative, qualitative, and mixed-methods study findings using PRISMA guidelines. Data sources: PubMed, PsycINFO, and CINAHL databases were searched on October 1, 2020. GRADE criteria were used to assess quality of quantitative reports, and the Johns Hopkins Evidence Level and Quality Guide was used to rate qualitative, mixed methods, and review articles. Data were synthesized using integrative thematic analysis. Results: The 67 studies reviewed describe a variety of legacy perceptions and interventions with adult and pediatric patients receiving palliative care. Statistically significant improvements in various dimensions of wellbeing are documented, with significant reduction in incidence and symptoms of depression in adults. Studies highlight the utility, feasibility, and perceived benefits of legacy interventions according to adult patients and their caregivers, and parents/caregivers of pediatric patients. Conclusions: Though future research with high-quality, experimental designs is needed, the positive outcomes associated with legacy interventions are documented in adult patient populations; additionally, the application of legacy interventions for children with serious illnesses receiving palliative care is reasonable based on the existing body of evidence. A consistent and operational concept of legacy is still needed for future research and practice.