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Sentinel-1 EW mode dataset for Antarctica from 2014–2020 produced by the CASEarth Cloud Service Platform

Big Earth Data 2022年第4期6卷 385-400页

作者： Dong liang Huadong Guo Lu Zhang haipeng lia Xuezhi Wang Key Laboratory of Digital Earth Science Aerospace Information Research InstituteChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina International Research Center of Big Data for Sustainable Development Goals BeijingChina Computer Network Information Center Chinese Academy of SciencesBeijingChina

Antarctica plays an important role in research on global change,and its unique geography,ocean,climate,and environment pro-vide an ideal place for humankind to understand Earth’s *** sensing provides an effective means to monitor and observe large-scale processes on the *** aperture radar(SAR)in particular provides the capability for all-weather Earth *** Sentinel-1A and Sentinel-1B SAR satellites have ideal ground coverage and imaging frequency for observing *** study developed a dataset of 69,586 Sentinel-1 EW mode satellite images of the Antarctic ice sheet from October 2014 to December *** dataset was processed with the European Space Agency Sentinel Application Platform(SNAP)and a Python batch scheduling tool on the Big Earth Data Cloud Service Platform of the Chinese Academy of Sciences Big Earth Data Science Engineering Program(CASEarth).Several data processing operations were implemented to process the raw dataset,including radiometric calibration,invalid edge removal,geocoding,data reprojection to an Antarctic projection,data compression to TIFF format,and construction of image *** dataset is avail-able at http://***/10.11922/sciencedb.j00076.00085.

关键词： Big Earth data CASEarth cloud computing Sentinel-1 Antarctica

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Temperature variations along the Silk Road over the past 2000 years:Integration and perspectives

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Science China Earth Sciences 2023年第7期66卷 1468-1477页

作者： Jianhui CHEN haipeng WANG Yan LIU Shuai MA Wei HUANG MOE Key Laboratory of Western China’s Environmental Systems Lanzhou UniversityLanzhou 730000China State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Reconstructing temperature changes along the Silk Road(SR)over the last two millennia can provide insights into past global changes and their impact on the rise and fall of ancient civilizations in this *** high-quality single-site paleotemperature records have been produced for the eastern part of the SR(mainly for the Xinjiang region and its surrounding areas),which provide the data basis for a comprehensive *** this study,we used objective criteria to select 10 highquality ones from 30 temperature reconstructions derived from various geological archives including lacustrine sediments,ice cores,and tree rings in this *** aims are to summarize the pattern of temperature change over the past 2000 years,to provide a long-term viewpoint on the present warming,and to evaluate the impact of climate change on civilizations along the *** principal results are as follows:(1)The temperature variations over the last millennium are mutually consistent within these *** study area experienced typical climate anomalies during the Medieval Warm Period(MWP,AD 1000-1250),the Little Ice Age(lia,AD 1450-1850),and the Current Warm Period(CWP,AD 1850 to present);however,contrary to previous knowledge,the amplitude of climatic warming during the CWP did not exceed that during the MWP.(2)Fewer temperature records were available for the interval AD 1–1000,and there were large differences between *** example,the reconstructed climate during both the Han Dynasty and the Sui-Tang Dynasties was either warm or cold,without prevailing consensus.(3)The warming during the MWP favored the rapid development of the SR route along the northern slopes of the Tianshan Mountains,and the cooling during the lia contributed to the decline of the SR marked by the closure of the Jiayuguan ***,the scarcity of temperature records and the discrepancies between them during AD 1-1000 in the eastern part of the SR have hindered our understanding of the hydroclim

关键词： Silk Road Medieval Warm Period Little Ice Age Current Warm Period Rise and fall of civilizations

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