石堅論壇
石堅論壇第58講: Recent Global Lake Change Patterns Revealed from Remotely Sensed Big Data
文章來源： | 發布時間：2019-09-06 | 【打印】 【關閉】
報告人：盛永偉教授 加州大學洛杉磯分校(UCLA)地理系
報告摘要： Lakes store a major portion of liquid freshwater on the Earth’s surface, representing an irreplaceable resource to domestic, agricultural, and industrial water supplies. They are dynamic and complex aquatic ecosystems, significant sources of food and recreation, and a source of water vapor and trace gases to the atmosphere. Changes in the extent of lakes thus have significant ramifications for the hydrology, ecology, carbon cycle, exchange of energy and greenhouse gases with the atmosphere, and human use. Understanding their distributions and change trends at regional and global scales is of crucial social and ecological importance. Remote sensing offers the only feasible approach for systematic lake mapping and inventory at the global scale. This presentation introduces our recently produced circa-2000 and circa-2015 high-resolution global lake databases from remote sensing in order to provide a comprehensive assessment of decadal lake dynamics. Nearly nine-million lakes have been delineated using the big-data archive of Landsat scenes acquired during “lake-stable” seasons, and the mapped lake extents have gone through intensive quality assurance and quality control (QA/QC) procedures. Lake geographic and size distributions for each continent will be discussed. The detected lake changes exhibit strongly heterogeneous spatial patterns that can be explained by regional climatic changes together with localized glacier variations and human disturbance activities. The observed 15-year lake changes provide a valuable baseline for lake dynamics studies, and a number of lake change hotspots have been identified for intensive filed observation, further investigation, and long-term monitoring.
報告人簡介：
盛永偉教授，加州大學洛杉磯分校(UCLA)地理系教授，主要研究方向包括遙感、攝影測量、地理信息系統，及其在資源管理、環境分析及全球變化研究中的應用。早年畢業于浙江大學地球科學系遙感專業，分別于1988、1991獲得學士和碩士學位，并于2000年獲得加州大學伯克利分校環境科學及政策管理系博士學位。曾任教于紐約州立大學環境科學暨林業學院。在國際主要專業期刊上發表論文百篇，其中包括Science、Nature、PNAS等雜志，Nature曾報道他的研究成果。他近期的研究項目包括北極地區熱融湖研究、青藏高原古湖泊及現代湖泊、中亞地區水資源，以及全球湖泊動態演變研究等等。他曾擔任美國USGS/NASA Landsat系列衛星科學委員會委員，目前是NASA新一代海洋與水文衛星SWOT計劃科學委員會成員。此外，還是中國科學院聘請的海外評審專家，2018/2019學年度作為特聘教授在中科院青藏高原研究所訪學。
主持人：蘇奮振 研究員
時 間：2019年9月12日（星期四）上午9:30
地 點：中科院地理資源所A0212會議室
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