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Pioneer organisms after F-F mass extinction in Dushan region,Guizhou Province,and their significance in establishing new ecosystem

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Science china {1. {2. 2006年第5期49卷 449-460页

作者： wang yue1, 2. wang Xunlian1 & {2. xiaoying1 1. school of earth sciences and resources, china university of geosciences, beijing 100083, china 2. school of resources and Environment, Guizhou university, Guiyang 550003, china 1. school of {1. {2. and resources China University of Geosciences Beijing 100083 China 2. {1. of resources and Environment Guizhou University Guiyang 550003 China

After mass extinctions, most areas became “ecologically barren areas” lacking or even without ecosystem over an extensive region. Studying the pioneer organisms and the reconstruction process of a new ecosystem in the “ecologically barren area” is very important for revealing the evo- lution after bio-mass extinctions. In the Dushan region, Guizhou Province, china, the trace fossils appeared and flourished evidently earlier than body fossils after Frasnian-Famennian (F-F) mass extinction. The pioneer organisms and pathfinders in the “ecologically barren areas” are the trace-makers that are deposit-feeders with relatively simple structure and conformation on or near the deposit surface. The trace-makers have undergone an evolutionary process that their trace structures changed from simple to complex, and their living and moving areas and spaces enlarged from linear to planar and then to three-dimension spaces. Those characters show that the ability of the trace-makers to deposits and their efficiency of looking for food have been enhanced gradually and that those trace-makers constructed gradually a base for the new ecosystem. This process is similar to that of the trace fossils near the Precambrian-Cambrian boundary. In the Dushan area, only the recovery intervals have been identified for the Famennian body fossils, with no eminent radiation interval recognizable due to the Devonian-Carboniferous (C-D) mass ex- tinction. However, both the recovery and radiation intervals may be clearly recognized in the Famen- nian trace fossils based on their conformation and diversity. The evolution and diversification of the trace fossils in the “ecologically barren area” is considered to have played a role of necessary foun- dation for the recovery of body fossils in the ecological chain. With the gradual disappearance of the unfavourable environment factors resulting in the F-F mass extinction, a new ecosystem was reconstructed in the “ecologically barren area” through a three-

关键词： pioneer organisms, reconstruction of ecosystem, trace fossils, F-F mass extinction, Later Devonian, Dushan region, Guizhou Province, china.

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Spatio-temporal carbon isotope variation during the Ediacaran period in South china and its impact on bio-evolution

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Science china {1. {2. 2009年第10期52卷 1520-1528页

作者： wang XinQiang1.& {1. {2.,2.1 school of earth Science and Mineral resources, china university of geosciences, beijing 100083, china 2.State Key Laboratory of Geological Processes and Mineral resources, beijing 100083, china school of {1. Science and Mineral {2. China University of Geosciences Beijing 100083 China State Key Laboratory of Geological Processes and Mineral resources Beijing 100083 China

The Ediacaran period is characterized by the extremely negative carbon isotope anomalies and great biotic evolution in earth history. At least four negative carbon isotope anomalies have been reported from this interval in South{1. so far. It is traditionally argued that the isotope variations can be used as a useful tool for global correlation of Ediacaran succession; however, more and more researches argued against this idea. We reviewed the previously published carbon isotope data in South{1., and distributed the mean values of a certain time to the paleogeographic maps. The results show that the carbon isotope values (δ1.C) vary greatly in different environments, but a clear tendency of becoming lighter from shallow platform to deep basin, with a maximum variation up to 1. Moreover, the important changes in Ediacaran biota, marked by the introducing of new taxa or ecologic groups, seemed to always postdate the negative anomalies but coincide with the positive shift. If the negative excursions represented the oxidation of a large dissolved organic carbon (DOC) reservoir in the ocean, the diverse Ediacaran organisms and the carbon isotope anomalies may suggest totally different environments: oxic and anoxic/euxinic. We also suggest that the elimination of euxinic state through precipitation of pyrites is one of the important environment factors in prompting the Ediacaran bio-evolution.

关键词： Ediacaran South china carbon isotope spatio-temporal variations bio-evolution

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Spatiotemporal variations in glacier area and surface velocity of the northern Antarctic Peninsula during 2.18-{1.{1.

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Advances in Climate Change Research 2024年第2期15卷 297-311页

作者： Yu-Long KANG shi-Chang KANG Wan-Qin GUO Tao CHE Zong-Li JIANG Zhen-Feng {1. Qiang-Qiang XU Cheng-De YANG State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China university of Chinese Academy of {1. Beijing 100083China Key Laboratory of Remote Sensing of Gansu Province Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China school of {1. {2. and Spatial Information Engineering Hunan University of Science and TechnologyXiangtan 411201China

Ice sheet serves as a crucial indicator for assessing climate *** loss in recent remote sensing-based studies indicated that the Antarctic Peninsula has rapid rates of glacier retreat and speed up of surface ***,observations of seasonal variability of ice speed are limited,and glacier-area changes require multi-temporal *** study investigated the changes in area and surface velocities of∼375 glaciers on the northern Antarctic Peninsula(NAP)utilizing satellite images acquired by the Sentinel 1.2.satellites during *** results indicate that the glacier area reduced by approximately 1.6.1.44.2.km^(2.(-0.2.±0.1.per year)during the study period,with an acceleration after 2.2.(-0.4%±0.3%per year),and the most dramatic reduction happened on the eastern *** maximum annual ice speeds on the NAP generally exceeded 3500 m per year,while the ice speeds in 2.2. were the highest(exceeded 42.0 m per year).The ice speed variability in austral autumn was higher than in other seasons,meanwhile the summer ice speeds showed an increasing *** glacier G01.0}58E4701.N,McNeile Glacier,glacier G2.9637E64094S and Drygalski Glacier showed the most remarkable ice speed variations represented by high daily velocities and strong fluctuations on their *** results demonstrated that the variations in glacier area and seasonal ice speed on the NAP were responsive to the ice-ocean-atmosphere ***,seasonal velocity and area variations should be considered when conducting accurate mass balance calculations,model validations and change mechanism analyses under climate warming scenarios.

关键词： Glacier area Seasonal ice speed Sentinel 1.2 Northern Antarctic Peninsula Ice-ocean-atmosphere processes

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Artificial intelligence for geoscience:Progress,challenges,and perspectives

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The Innovation 2024年第5期5卷 136-160,135页

作者： Tianjie Zhao Sheng wang Chaojun Ouyang Min Chen Chenying Liu Jin Zhang Long Yu Fei wang Yong Xie Jun Li Fang wang Sabine Grunwald Bryan MWong Fan Zhang Zhen Qian Yongjun Xu Chengqing Yu Wei Han Tao Sun Zezhi Shao Tangwen Qian Zhao Chen Jiangyuan Zeng Huai Zhang Husi Letu Bing Zhang Li wang Lei Luo Chong shi Hongjun Su Hongsheng Zhang Shuai Yin Ni Huang Wei Zhao Nan Li Chaolei Zheng Yang Zhou Changping Huang Defeng Feng Qingsong Xu Yan Wu Danfeng Hong Zhenyu wang Yinyi Lin Tangtang Zhang Prashant Kumar Antonio Plaza Jocelyn Chanussot Jiabao Zhang Jiancheng shi Lizhe wang Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China school of Computer Science China University of GeosciencesWuhan 430078China State Key Laboratory of Mountain Hazards and Engineering Resilience Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610299China Key Laboratory of Virtual Geographic Environment(Ministry of Education of PRC) Nanjing Normal UniversityNanjing 210023China Data Science in earth Observation Technical University of Munich80333 MunichGermany The National Key Laboratory of Water Disaster Prevention Yangtze Institute for Conservation and DevelopmentHohai UniversityNanjing 210098China Institute of Computing Technology Chinese Academy of SciencesBeijing 100190China school of Geographical {1. Nanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Soil Water and Ecosystem Sciences DepartmentUniversity of FloridaPO Box 110290GainesvilleFLUSA Materials Science Engineering Program Cooperating Faculty Member in the Department of Chemistry and Department of Physics Astronomy University of CaliforniaCaliforniaRiversideCA 92521USA Institute of Remote Sensing and Geographical Information System School of Earth and Space SciencesPeking UniversityBeijing 100871China Key Laboratory of Computational Geodynamics University of Chinese Academy of SciencesBeijing 100049China International Research Center of Big Data for Sustainable Development Goals Beijing 100094China College of Geography and Remote Sensing Hohai UniversityNanjing 211100China Department of Geography The University of Hong KongHong Kong 999077SARChina Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Nanjing 210044China school of Environmental Science and Engineering Nanjing University of Information Science&TechnologyNanjing 210044China Collaborative Inno

This paper explores the evolution of geoscientific inquiry,tracing the progression from traditional physics-based models to modern data-driven approaches facilitated by significant advancements in artificial intelligence(AI)and data collection *** models,which are grounded in physical and numerical frameworks,provide robust explanations by explicitly reconstructing underlying physical ***,their limitations in comprehensively capturing earth’s complexities and uncertainties pose challenges in optimization and real-world *** contrast,contemporary data-driven models,particularly those utilizing machine learning(ML)and deep learning(DL),leverage extensive geoscience data to glean insights without requiring exhaustive theoretical *** techniques have shown promise in addressing earth science-related ***,challenges such as data scarcity,computational demands,data privacy concerns,and the“black-box”nature of AI models hinder their seamless integration into *** integration of physics-based and data-driven methodologies into hybrid models presents an alternative *** models,which incorporate domain knowledge to guide AI methodologies,demonstrate enhanced efficiency and performance with reduced training data *** review provides a comprehensive overview of geoscientific research paradigms,emphasizing untapped opportunities at the intersection of advanced AI techniques and *** examines major methodologies,showcases advances in large-scale models,and discusses the challenges and prospects that will shape the future landscape of AI in *** paper outlines a dynamic field ripe with possibilities,poised to unlock new understandings of earth’s complexities and further advance geoscience exploration.

关键词： earth utilizing landscape

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Littoral landforms of Lake Hulun and Lake Buir(china and Mongolia):Wind-driven hydro-sedimentary dynamics and resulting clastics distribution

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Journal of Palaeogeography 2024年第2期13卷 309-326页

作者： Li wang Mathieu Schuster {1.-Wei Xin Florin Zainescu Xin-Yu Xue Joep Storms Jan-Hendrik May Alexis Nutz Helena van der Vegt Guilherme Bozetti Zai-Xing Jiang school of Energy {1. China University of Geosciences(Beijing)Beijing100083China Universite de Strasbourg CNRSENGEESInstitut Terre et Environnement de StrasbourgUMR 70635 Rue DescartesStrasbourgFrance Tamsag Mongolia(XIX)Ltd. PetroChinaDaqing 163000China CEREGE Aix-Marseille UniversitéCNESIRDCollege de FranceINRAAix en ProvenceFrance school of Marine Science Sun Yat-sen UniversityZhuhai 519083China Delft university of Technology Department of Geoscience and EngineeringDelfthe Netherlands school of Geography Earth and Atmospheric SciencesUniversity of Melbourne253 Elgin St.CarltonVIC 3053Australia Deltares Delfthe Netherlands SCMF Faculty of GeographyUniversity of Bucharest1 N.Balcescu Blv.BucharestRomania

Two rectangular-shaped lakes,Lake Hulun and Lake Buir,located at the boundary between china and Mongolia,only c.75 km apart and therefore experiencing similar wind fields,have been studied based on satellite images and field surveys in order to compare their geomorphological and sedimentological *** wind-driven hydrodynamics,which have a significant effect on the development of littoral landforms and on sediment distribution,have been discussed for the two similar lakes that experienced a prevailing wind perpendicular to their long axis.A conceptual model related to wind-driven water bodies and sediment distribution is ***-influenced to wave-dominated deltas,beaches,spits,and eolian dune deposits develop around these two lakes,with a strikingly similar distribution *** features locally inform the longshore drift and help reconstruct the water circulation induced by wind *** the NW prevailing wind regime,the spits developed on the SW coast with a NW—SE extension,which was influenced by the NW—SE longshore *** same influence was observed in the delta extension in the NE *** differences lie in the presence of fan deltas in the NW region of Lake Hulun,but not in Lake ***,the width of the beach and eolian deposits on the downwind coast of Lake Hulun is three times greater than that of Lake Buir which were caused by the differences in sediment supply and wind fetch between the two *** Hulun and Lake Buir provide two reliable examples to understand the relation{1.p among the wind field,provenance,hydrodynamics,landforms,and asymmetrical distribution of clastics in elongated *** also represent relevant modern analogs,which may also be of guiding significance to wind-driven sand body prediction in lacustrine basins.

关键词： Wind-driven lakes Fetch Sedimentary facies Hydrodynamics Geomorphology Spits Shoreline Lake Hulun Lake Buir

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Accumulation and Fractionation of Rare earth Elements in a Soil-Wheat System

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Pedosphere 2006年第1期16卷 82-90页

作者： DING shi-Ming LIANG Tao ZHANG Chao-Sheng {1. Li-Jun SUN Qin Nanjing Institute of Geography ＆ Limnology Chinese Academy of Sciences Nanjing 210008 （China） Institute of Geographic sciences and Natural {1. Research Chinese Academy of Sciences Beijing 100101 （ China） Department of Geography and Environmental Change Institute National University of Ireland Galway （Ireland） State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing 210093 （China）

Time series bioaccumulation of rare earth elements （REEs） in field-grown wheat with and without a dressing of extraneous REE fertilizer at different growth stages and fractionation of REEs during their transport in a soil-wheat system were determined. Time-dependent accumulation of extraneous REEs was found in different parts of wheat. An upward transport of extraneous REEs from roots to shoots under a soil dressing and a downward transport from leaves to roots with a foliar dressing were also observed. Moreover, fractionation of REEs occurred in the soil-wheat system. Compared to the host soil a positive Eu anomaly in the stems and grains as well as heavy REE enrichment in the grains were found. The ability of the different wheat organs to fractionate Eu from the REE series was ranked in the order of sterns 〉 grains 〉 leaves 〉 roots.

关键词： accumulation fractionation rare earth elements wheat

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Reconciled estimation of Antarctic ice sheet mass balance and contribution to global sea level change from 1.96 to 2.2.

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Science china {1. {2. 2024年第11期67卷 3562-3578页

作者： Rongxing LI Guojun LI Gang HAI Huan XIE Yuan CHENG Wei CHEN Xiangbin CUI Minghu DING Chunchun GAO Tong HAO Changqing KE Chuanjin LI Jin LI Yan LIU Jiangjun RAN Jiawen REN Qiang SHEN Yunzhong SHEN Hongling shi Songyun {1. Zemin {1. Jingang ZHAN Baojun ZHANG Min ZHONG Chunxia ZHOU Center for Spatial Information Science and Sustainable Development Applications Tongji University College of Surveying and Geo-informatics Tongji University Institute for the Conservation of Cultural Heritage School of Cultural Heritage and Information Management Shanghai University College of Resource Environment and Tourism Hubei University of Arts and Science Polar Research Institute of china State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences College of Geodesy and Geomatics Shandong University of Science and Technology school of Geography and Ocean Science Nanjing University Shanghai Astronomical Observatory Chinese Academy of Sciences State Key Laboratory of Remote Sensing Science Faculty of Geographical Science Beijing Normal University Department of earth and Space {1. Southern University of Science and Technology State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences State Key Laboratory of Geodesy and earth's Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of Sciences Center for Space Research University of Texas at Austin Chinese Antarctic Center of Surveying and Mapping Wuhan University school of Geospatial Engineering and Science Sun Yat-sen University

The Antarctic Ice Sheet（AIS） has been losing ice mass and contributing to global sea level rise（GSLR）. Given its mass that is enough to cause ～58 m of GSLR, accurate estimation of mass balance trend is critical for AIS mass loss monitoring and sea level rise forecasting. Here, we present an improved approach to reconciled solutions of mass balance in AIS and its regions from multiple contributing solutions using the input-out, altimetric, and gravimetric methods. In comparison to previous methods, such as IMBIE 2.18, this approach utilizes an adaptive data aggregation window to handle the heterogeneity of the contributing solutions, including the number of solutions, temporal distributions, uncertainties, and estimation techniques. We improved the regression-based method by using a two-step procedure that establishes ensembled solutions within each method（input-output, altimetry, or gravimetry） and then estimates the method-independent reconciled solutions. For the first time, 1.contributing solutions from 8 Chinese institutions are used to estimate the reconciled mass balance of AIS and its regions from1.96 to {1.{1.. Our results show that AIS has lost a total ice mass of ～3{1.3±{1.3 Gt during the period, an equivalent of～8.9±0.7 mm of GSLR. There is a sustained mass loss acceleration since {1.06, from 88.1.3.6 Gt yr-1.uring 1.96–{1.05 to 1.0.7 ±8.4 Gt yr-1.uring {1.06–2.13 and further to 1.7.0±9.0 Gt yr-1.uring 2.14–{1.{1.. The mass loss signal in the West Antarctica and Antarctic Peninsula is dominant and clearly presented in the reconciled estimation and contributing solutions, regardless of estimation methods used and fluctuation of surface mass balance. Uncertainty and challenges remain in mass balance estimation in East Antarctica. This reconciled estimation approach can be extended and applied for improved mass balance estimation in the Greenland Ice Sheet and mountain glacier regions.

关键词： Antarctic Ice Sheet Ice mass loss acceleration Sea level rise Reconciled estimation

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Two-dimensional Sb net generated nontrivial topological states in SmAgSb_(2. probed by quantum oscillations

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Chinese Physics B 2024年第7期33卷 51-58页

作者：袁健石贤彪杜红李田郗传英王霞夏威王保田钟瑞丹郭艳峰 school of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghai 200240China Xingzhi College Zhejiang Normal UniversityJinhua 321100China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of SciencesHefei 230031China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China

The REAgSb_(2.(RE = rare {1. and Y) family has drawn considerable research interest because the two-dimensional Sb net in their crystal structures hosts topological fermions and hence rich topological properties. We report herein the magnetization and magnetotransport measurements of SmAgSb_(2. single crystal, which unveil very large magnetoresistance and high carrier mobility up to 6.2.× 1.^(3)% and 5.58 × 1.^(3)cm^(2.·V^(-1.·s^(-1., respectively. The analysis of both Shubnikov–de Haas and de Haas–van Alphen quantum oscillations indicates nontrivial Berry phases in the paramagnetic state while trivial Berry curvature in the antiferromagnetic state, indicating a topological phase transition induced by the antiferromagnetic order. It is also supported by the first-principles calculations. The results not only provide a new interesting topological material but also offer valuable insights into the correlation between magnetism and nontrivial topological states.

关键词： large magnetoresistance quantum oscillations topological phase transition

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机载多维度SAR图像地物数据集构建及融合分类方法

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遥感学报 2024年第9期28卷 2209-2222页

作者：郑乃榕杨子安施贤正杨宏孙越王峰复旦大学信息科学与工程学院电磁波信息科学教育部重点实验室上海200433 中国科学院空天信息创新研究院北京100094 西北工业大学电子信息学院西安710129

随着合成孔径雷达SAR(Synthetic Aperture Radar)成像和深度学习技术的发展,利用深度学习算法对SAR图像进行地物分类得到了广泛关注及应用研究。本文基于对地观测航空遥感系统高分机载数据构建了高分辨率机载多维度SAR地物分类数据集AIR... 详细信息

随着合成孔径雷达SAR(Synthetic Aperture Radar)成像和深度学习技术的发展,利用深度学习算法对SAR图像进行地物分类得到了广泛关注及应用研究。本文基于对地观测航空遥感系统高分机载数据构建了高分辨率机载多维度SAR地物分类数据集AIR-MDSAR-Map(Airborne Multi-Dimensional Synthetic Aperture Radar Mapping Dataset)。本数据集包含海南省万宁市和江苏省射阳县两个区域的P、L、S、C和Ka等5个波段的多极化SAR图像和高分辨率光学图像,将地物划分为水域、裸地、道路、工业区、林草地、住宅区、种植地、养殖场和其他等9类,并提供精细化的像素级别标签。本文首先利用深度学习中较经典的语义分割方法对AIRMDSAR-Map进行地物分类验证,同时也检验了不同波段SAR图像对各类地物的分类敏感性。然后,通过不同的融合策略对多维度SAR数据进行融合分类,最终融合方法在多类地物目标上的表现优于单波段,在综合指标FWIoU和PA上提升1.%—1.%,FWIoU达69%,PA达81.。该数据集将发布于国家综合地球观测数据共享平台(http://***[2.2.-06-2.]),能满足不同行业用户和科研用户的需求,可为多维度SAR数据的应用研究提供支撑。

关键词：遥感机载SAR 多维度地物分类深度学习语义分割 AIR-MDSAR-Map

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Chemocline instability and isotope variations of the Ediacaran Doushantuo basin in South china

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Science china {1. {2. 2008年第11期51卷 1560-1569页

作者： JIANG GanQing ZHANG shiHong shi {2. wang XinQiang Department of Geoscience University of NevadaLas VegasNV 89154-4010USA school of {1. {2. and resources China University of GeosciencesBeijing 100083China State Key Laboratory of Geological Process and Mineral resources Beijing 100083China

Stable isotope analyses in sections across a shelf to basinal transect of the Ediacaran Doushantuo basin show substantial isotope variabilities. In Songlin section where sediments were deposited in an intrashelf basin, δ 1.C values are persistently negative (_3‰ to _5‰, VPDB) through the entire Doushantuo Formation, similar to those obtained from the slope section in Wuhe (_5‰ to _1.‰, VPDB). Shallow water sections in Weng'an and Duoding show two broad δ 1.C anomalies overprinted with significant meter-scale variations, but none of the curves has similar absolute δ 1.C values compared to the Yangtze Gorges areas in South china and other sections globally. Such isotope variations, if partially recording ancient seawater signature, imply spatial and temporal chemocline instability in the Doushantuo basin. In combination with available δ 1.C records from other Ediacaran successions globally, the data from the Doushantuo basin are consistent, in first order, with the existence and oxidation of a large dissolved organic carbon (DOC) reservoir in Ediacaran oceans, but imply local environmental controls on Neoproterozoic isotope values and call attentions for using δ 1.C anomalies as time lines in stratigraphic correlation.

关键词： Ediacaran isotopes chemocline early animals Doushantuo Formation South china

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