bluuebunny/crossref_metadata_2025_split huggingface dataset:
Phosphorus Variations in Volcanic Sequences Reveal the Linkage Between Regional Tectonics and Terrestrial Biota Evolution
Authors: Ma Chao , Tang Yanjie , Foley Stephen F. , Ye Chenyang , Ying Jifeng , Zhao Xinmiao , Xiao Yan , Zhang Hongfu 
Published: August 2022

AbstractThe Middle‒Late Mesozoic massive volcanism formed a considerable thickness of volcanic‐sedimentary strata in western Liaoning, northern China. Concomitantly, it elevated phosphorus (P) availability for the rapid bloom of the terrestrial Yanliao and Jehol biotas, which developed highly abundant biodiversity and biomass. Hence, systematic tectonic and geochemical analyses of these volcanic‐sedimentary sequences with a significant P fluctuation would advance our understanding of the coevolutionary relationship between terrestrial biotas and regional tectonics. Here, we show that the secular variation of P availability in the Mesozoic volcanic rocks were the immediate results of the changes in volcanic intensity and lithospheric thickness controlled by the geological background of the cratonic destruction resulting from the paleo‐Pacific plate subduction. This study reveals the constraint effect of regional tectonics on the evolution of terrestrial ecosystems through the volcanism and P cycle.
Chemical Toxicants in Water: A GeoHealth Perspective in the Context of Climate Change
Authors: Joseph Naveen , Libunao Tate , Herrmann Elizabeth , Bartelt‐Hunt Shannon , Propper Catherine R. , Bell Jesse , Kolok Alan S. 
Published: August 2022

AbstractThe editorial focuses on four major themes contextualized in a virtual GeoHealth workshop that occurred from June 14 to 16, 2021. Topics in that workshop included drinking water and chronic chemical exposure, environmental injustice, public health and drinking water policy, and the fate, transport, and human impact of aqueous contaminants in the context of climate change. The intent of the workshop was to further define the field of GeoHealth. This workshop emphasized on chemical toxicants that drive human health. The major calls for action emerged from the workshop include enhancing community engagement, advocating for equity and justice, and training the next generation.
On the Relationship Between Oceanic Plate Speed, Tectonic Stress, and Seismic Anisotropy
Authors: Kendall E. , Faccenda M. , Ferreira A. M. G. , Chang S.‐J. 
Published: August 2022

AbstractSeismic radial anisotropy (the squared ratio between the speeds of horizontally and vertically polarized shear waves, ) is a powerful tool to probe the direction of mantle flow and accumulated strain. While previous studies have confirmed the dependence of azimuthal anisotropy on plate speed, the first order control on radial anisotropy is unclear. In this study, we develop 2D ridge flow models combined with mantle fabric calculations to report that faster plates generate higher tectonics stresses and strain rates which lower the dislocation creep viscosity and lead to deeper anisotropy than beneath slower plates. We apply the SGLOBE‐rani tomographic filter, resulting in a flat depth‐age trend and stronger anisotropy beneath faster plates, which correlates well with 3D global anisotropic mantle models. Our predictions and observations suggest that as plate speed increases from 2 to 8 cm/yr, radial anisotropy increases by ∼0.01–0.025 in the upper 100–200 km of the mantle between 10 and 60 Ma.
Evidence for a Relatively Warm Mid‐to Late Holocene on the Southeastern Tibetan Plateau
Authors: Feng Xiaoping , Zhao Cheng , D'Andrea William J. , Hou Juzhi , Yang Xiangdong , Xiao Xiayun , Shen Ji , Duan Yanwu , Chen Fahu 
Published: August 2022

AbstractThe Holocene temperature discrepancy between paleoclimate reconstructions and climate model simulations—known as the Holocene temperature conundrum—calls for new high‐quality Holocene temperature records at high elevations. Here, we present a quantitative Holocene mean annual air temperature record based on a site‐specific branched glycerol dialkyl glycerol tetraethers calibration from a small remote alpine lake on the southeastern Tibetan Plateau. The record reveals a temperature history comprising a relatively cool early Holocene (before 7 ka) followed by a warmer mid‐ to late‐Holocene (after 7 ka), which was likely linked to increasing local annual insolation and greenhouse gases. Three cold events punctuated the general warming trend ca. 10.4 ka, 3.7 ka, and 1.7 ka BP, and correspond closely in time to ice rafting events in the North Atlantic, and to episodes of volcanism and/or unusual solar activity. The entire Holocene temperatures are cooler than the previously identified anthropogenic warming from 1990–2015 AD.
Enhanced Weathering Triggered the Transient Oxygenation Event at ∼1.57 Ga
Authors: Tang Dongjie , Fu Xuewu , Shi Xiaoying , Zhou Limin , Zheng Wang , Li Chao , Xu Dongtao , Zhou Xiqiang , Xie Baozeng , Zhu Xiyan , Jiang Ganqing 
Published: August 2022

AbstractThe mid‐Proterozoic (∼1.8–0.8 Ga) is characterized by low atmospheric oxygen and pervasive oceanic anoxia, with transient oxygenation events. One of the oxygenation events happened at ∼1.57 Ga, during which atmospheric O2 may have reached ≥4% present atmospheric level (PAL) and thus promoted the evolution of multi‐cellular eukaryotes. The cause of this oxygenation event, however, remained unknown. Here, we report δ202Hg, ∆199Hg, P concentration, Rb/Al, and εNd(t) data across the ∼1.57 Ga oxygenation event in the Gaoyuzhuang Formation of North China. The positive δ202Hg, εNd(t), and negative Δ199Hg shifts, plus the accompanied peaks in Rb/Al, P, and I/(Ca + Mg), suggest that this oxygenation event was likely resulted from enhanced weathering of intermediate to mafic rocks, which may have promoted primary production via increasing P influx to the ocean and led to the rise in oxygen levels. The data indicate that enhanced weathering input could trigger transient oxygenation events during the mid‐Proterozoic.
Bores Observed During the Warm Season of 2015–2019 Over the Southern North China Plain
Authors: Zhang Shushi , Parsons David B. , Xu Xin , Sun Jisong , Wu Tianjie , Xu Fen , Wei Na , Chen Gang 
Published: August 2022

AbstractThis first multi‐year investigation focuses on bores over the southern North China Plain during the 2015–2019 warm seasons. Bore structure depended on location with undular bores tending to occur close to the coast and non‐undular bores to the west near elevated terrain. Bores were most likely to occur during June and July when convection is active. While bore frequency over the Southern Great Plains (SGP) of U.S. is linked to the region's nocturnal low‐level jet, the bores herein were sensitive to the synoptic regime with ∼80% occurring during 4‐to‐5‐day periods under three different synoptic regimes. The bores had shorter durations than their SGP counterparts and a far wider range in their direction of propagation. Overall, these findings find regional differences in bores' frequency, movement, and structure serving an impetus for future investigations of nocturnal mesoscale convective systems and bores over China and other locations worldwide.
A Geo‐Structurally Based Correction Factor for Apparent Dissolution Rates in Fractured Media
Authors: Hyman Jeffrey D. , Navarre‐Sitchler Alexis , Andrews Elizabeth , Sweeney Matthew R. , Karra Satish , Carey J. William , Viswanathan Hari S. 
Published: August 2022

AbstractField measurements of apparent geochemical weathering reaction rates in subsurface fractured porous media are known to deviate from laboratory measurements by multiple orders of magnitude. To date, there is no geologically based explanation for this discrepancy that can be used to predict reaction rates in field systems. Proposed correction factors are typically based on ad hoc characterizations related to geochemical kinetic models. Through a series of high‐fidelity reactive transport simulations of mineral dissolution within explicit 3D discrete fracture networks, we are able to link the geo‐structural attributes with reactive transport observations. We develop a correction factor to linear transition state theory for the prediction of the apparent dissolution rate based on measurable geological properties. The modified rate law shows excellent agreement with numerical simulations, indicating that geological structure could be a primary reason for the discrepancy between laboratory and field observations of apparent dissolution rates in fractured media.
Effect of ICME‐Driven Storms on Field‐Aligned and Ionospheric Currents From AMPERE and SuperMAG
Authors: Pedersen M. N. , Vanhamäki H. , Aikio A. T. , Waters C. L. , Gjerloev J. W. , Käki S. , Workayehu A. B. 
Published: August 2022

AbstractThis study investigates the field‐aligned currents (FACs) and ionospheric equivalent currents for interplanetary coronal mass ejection (ICME)‐driven storms by considering 45 events with a minimum Dst ≤ −50 nT. The FACs and ionospheric equivalent currents are studied by applying a superposed epoch analysis to data from AMPERE and SuperMAG with the zero epoch (t0) centered at the onset of the storm main phase. The currents and number of substorm onsets begin to increase 3 hr before t0 and maximizes about 1 hr after t0. The currents and number of substorm onsets remain high throughout the entire storm main phase, until at t0 + 14 hr they start to slowly relax back to quiet time conditions. The storms were separated into two groups based on the solar wind dynamic pressure pdyn around t0. High pdyn storms are mostly driven by the sheath region ahead of the ejecta. These storms have short main phase durations and larger currents early in the main phase which maximize at t0 + 50 min. The low pdyn group contains storms that start during the magnetic clouds (MC) and have gradually increasing currents that maximize at t0 + 11 hr, close to the end of the storm main phase. For the first 4 hr of the storm main phase, the currents in sheath‐driven storms are larger than for MC‐driven storms. The Russell‐McPherron effect is less important for ICME‐driven storms where only 44% have a contribution, compared to 82% of high speed stream/stream interaction driven storms.
The Role of Crustal Accretion Variations in Determining Slab Hydration at an Atlantic Subduction Zone
Authors: Allen R. W. , Collier J. S. , Henstock T. J. ,   The VoiLA Consortium
Published: August 2022

AbstractWe present a 2D P‐wave velocity model from the outer rise region of the Lesser Antilles island arc, the first wide‐angle seismic study of outer rise processes at an Atlantic subduction zone. The survey consists of 46 OBS receivers over a 174 km profile with velocities resolved to 15 km below top basement. The final velocity model, produced through tomographic inversion, shows a clear decrease in the velocity of the lower crust and upper mantle of the incoming plate as it approaches the trench. We attribute this drop to outer rise bend‐related hydration, similar to Pacific cases, but superimposed on spatial variations in hydration generated at the slow‐spreading ridge axis. In thin, tectonically controlled crust formed under magma‐poor spreading conditions the superposition of these sources of hydration results in compressional velocities as low as 6.5 km s−1 beneath the PmP reflector. In contrast, segments of crust interpreted as having formed under magma‐rich conditions show velocity reductions and inferred hydrous alteration more like that observed in the Pacific. Hence, variations in the style of crustal accretion, which is observed on 50–100 km length scales both along and across isochrons, is a primary control over the distribution of water within the slab at Atlantic subduction systems. This heterogeneous pattern of water storage within the slab is likely further complicated by along strike variations in outer rise bending, subducting fracture zones and deformation at segment ends and may have important implications for our understanding of long‐term patterns of hazard at Atlantic subduction systems.
A Depth‐Transect of Ocean Deoxygenation During the Paleocene‐Eocene Thermal Maximum: Magnetofossils in Sediment Cores From the Southeast Atlantic
Authors: Xue Pengfei , Chang Liao , Dickens Gerald R. , Thomas Ellen 
Published: August 2022

AbstractThe Paleocene‐Eocene Thermal Maximum (PETM, ∼56 Ma) presents a past analog for future global warming. Previous studies provided evidence for major loss of dissolved oxygen during the PETM, although understanding the degree and distribution of oxygen loss poses challenges. Magnetofossils produced by magnetotactic bacteria are sensitive to redox conditions in sediments and water columns, and have been used to reconstruct paleoredox conditions over a range of geological settings. Here, we present records of well‐preserved magnetofossils from cores along Walvis Ridge in the Southeast Atlantic that span the PETM across a depth transect (∼1,500–3,600 m paleodepth). Hysteresis, isothermal remanent magnetization curves, first‐order reversal curve diagrams, and low‐temperature magnetic measurements document large variations in magnetic properties of magnetofossils, which relate to time and water depth. Abundant magnetofossil grains are present within the studied sediments, and their morphologies change with paleodepth, as shown by transmission electron microscope observations. Magnetofossils from samples within the PETM onset at the deeper sites (∼2,600–3,600 m paleodepth) have lower coercivity values, a higher oxidation degree, and smaller grain sizes than those from shallower sites (∼1,500–1,800 m paleodepth), likely reflecting changes in paleoredox conditions at different paleodepths. We use the magnetofossil records to reconstruct relative changes in dissolved oxygen content at different water depths through the PETM, and suggest that ocean deoxygenation likely expanded downwards in the early stages of the PETM. We thus demonstrate the value of magnetofossil records for paleoenvironmental reconstructions over time and space, particularly for sediments that lack carbonate fossils.
The Changing Behavior of the West Greenland Current System in a Very High‐Resolution Model
Authors: Gou Ruijian , Pennelly Clark , Myers Paul G. 
Published: August 2022

AbstractAnalyzing a high‐resolution (1/60°) numerical model over 2008–2018, the inter‐annual variability of the West Greenland Coastal Current (WGCC) on the shelf and West Greenland Current (WGC) at the shelf break is presented. Both currents flow from Cape Farewell and extend to Davis Strait, with their speeds and transports corresponding well with observations. The trend over the study period of the WGCC and WGC strength near southwest Greenland are opposite, with the former declining while the latter strengthened, both by a speed change above 0.1 m/s. Both currents are predominantly buoyancy forced, but wind forcing becomes more dominant approaching Davis Strait. The main exchanges from the two currents with the interior of the Labrador Sea occur between Cape Desolation and Fylla Bank. The net volume, freshwater, heat transport decreases between these two sections are 1.4 Sv, 13 mSv, 36.7 TW, respectively. The freshwater transport of the WGC itself does not drop in between these sections, receiving freshwater from the WGCC to compensate for the losses to the basin interior. Thus, we see significant freshwater (83.1 mSv) and heat transports (70.7 TW) of the WGC remaining at Fylla Bank that reach the northern basin instead of being fluxed into the interior of the Labrador Sea. This suggests that the exchange between the boundary current system and the interior is more limited than previously thought, and most of the Greenland and Arctic melt reaches the northern Labrador Sea. Our results highlight the importance of resolving the WGCC and shelf processes.
The Role of Fronts in Horizontal Transports of the Changjiang River Plume in Summer and the Implications for Phytoplankton Blooms
Authors: Li Shuangzhao , Zhang Zhaoru , Zhou Meng , Wang Chuning , Wu Hui , Zhong Yisen 
Published: August 2022

AbstractFrontal processes play a significant role in estuarine and coastal ecosystem dynamics. In this study, a hydrodynamic model of the Changjiang River plume was developed based on the Regional Ocean Modeling System, and Lagrangian Coherent Structures (LCSs) were applied to the model simulations to analyze the horizontal transport characteristics of the river plume with the surface plume front, the tidal front, and the far‐field plume front in summer. The results show that the plume currents during the ebb tide were supercritical upstream of the near‐field surface plume front and tidal front and subcritical downstream of the fronts. In the LCSs results, transport barriers existing in the frontal regions indicated that the materials hardly crossed the fronts and tended to accumulate. The water parcels near the surface plume front and the tidal front in the near‐field entirely originated from the Changjiang River Estuary. The surface East China Sea shelf water could not influence the near‐field region due to the transport barrier formed by the far‐field plume front. Momentum balance analysis results reveal that the plume currents were in geostrophic balance around the near‐field fronts, rendering the flows mainly in the along‐front direction and significantly weakening the cross‐shore flows. These physical processes provided enough residence time of the plume water and growth time for phytoplankton in the frontal region and thus favored algal blooming with sufficient nutrients. Even though the frontal convergence induced by transport barriers also appeared near the far‐field plume front, insufficient supply of nutrients limited the phytoplankton growth.
Puy de Dôme Station (France): A Stoichiometric Approach to Compound Classification in Clouds
Authors: Renard Pascal , Bianco Angelica , Jänis Janne , Kekäläinen Timo , Bridoux Maxime , Deguillaume Laurent 
Published: August 2022

AbstractSeven cloud water samples were collected from May to October 2018 at the Puy de Dôme station (PUY) in France and analyzed by positive‐ion atmospheric pressure photoionization [(+)APPI] Fourier transform ion cyclotron resonance mass spectrometry. The assigned formulas (ranging from 3,865 to 6,380) were attributed using the multidimensional stoichiometric constraint classification of Rivas‐Ubach et al. (2018, https://doi.org.10.1021/acs.analchem.8b00529) to six main categories (RUCs): LipidC, ProteinC, Amino‐sugarC, CarbohydrateC, NucleotideC, and OxyaromaticC. Back trajectories were calculated by the computing atmospheric trajectory tool (CAT) model to obtain information on the air mass history. Partial least square regressions were performed using chemical data, CAT back‐trajectory calculations and FT‐ICR MS data to analyze the environmental variability of the organic sample composition. ProteinC is correlated with the continental surface for air masses transported within the boundary layer, and Amino‐sugarC is strongly correlated with acetate, NO3− and NH4+, suggesting Anthropogenic sources for amino sugars and proteins. LipidC is correlated with the sea surface for air masses transported within the free troposphere, confirming the long‐range transport of marine biogenic sources. Concerning Oxy‐aromaticC, given the correlations with oxidants and pollutants, as well as anti‐correlations with local influence, we proposed a mechanism of oxidation from remote anthropogenic sources.
Multifunctional resonant wavefront-shaping meta-optics based on multilayer and multi-perturbation nonlocal metasurfaces
Authors: Malek Stephanie C. , Overvig Adam C. , Alù Andrea , Yu Nanfang 
Published: August 2022

AbstractPhotonic devices rarely provide both elaborate spatial control and sharp spectral control over an incoming wavefront. In optical metasurfaces, for example, the localized modes of individual meta-units govern the wavefront shape over a broad bandwidth, while nonlocal lattice modes extended over many unit cells support high quality-factor resonances. Here, we experimentally demonstrate nonlocal dielectric metasurfaces in the near-infrared that offer both spatial and spectral control of light, realizing metalenses focusing light exclusively over a narrowband resonance while leaving off-resonant frequencies unaffected. Our devices attain this functionality by supporting a quasi-bound state in the continuum encoded with a spatially varying geometric phase. We leverage this capability to experimentally realize a versatile platform for multispectral wavefront shaping where a stack of metasurfaces, each supporting multiple independently controlled quasi-bound states in the continuum, molds the optical wavefront distinctively at multiple wavelengths and yet stay transparent over the rest of the spectrum. Such a platform is scalable to the visible for applications in augmented reality and transparent displays.
ZNF655 accelerates progression of pancreatic cancer by promoting the binding of E2F1 and CDK1
Authors: Shao Zhuo , Li Chenggang , Wu Qiao , Zhang Xingmao , Dai Yang , Li Shenming , Liu Xinyuan , Zheng Xinying , Zhang Jiansheng , Fan Hua 
Published: August 2022

AbstractPancreatic cancer has an extremely terrible prognosis and is a common cause of cancer death. In this study, the clinic value, biological function and underlying mechanisms of Zinc finger protein 655 (ZNF655) in human pancreatic cancer were evaluated. The expression level of ZNF655 in pancreatic cancer was determined by immunohistochemistry (IHC) staining. The biological effects of ZNF655 in pancreatic cancer cells was investigated by loss/gain-of-function assays in vitro and in vivo. The downstream molecular mechanism of ZNF655 was explored using co-immunoprecipitation (Co-IP), dual-luciferase reporter and chromatin immunoprecipitation (Ch-IP). ZNF655 expression was significantly elevated in human pancreatic cancer and possessed clinical value in predicting poor prognosis. Functionally, ZNF655 knockdown inhibited the biological progression of pancreatic cancer cells, which was characterized by weaken proliferation, enhanced apoptosis, arrested cell cycle in G2, impeded migration, and suppressed tumor growth. Mechanistically, ZNF655 played an important role in promoting the binding of E2F transcription factor 1 (E2F1) to the cyclin-dependent kinase 1 (CDK1) promoter. Furthermore, knockdown of CDK1 alleviated the promoting effects of ZNF655 overexpression in pancreatic cancer cells. The promotive role of ZNF655 in pancreatic cancer via CDK1 was determined, which drew further interest regarding its clinical application as a promising therapeutic target.