石坚论坛

石坚论坛第58讲: Recent Global Lake Change Patterns Revealed from Remotely Sensed Big Data

文章来源:  |  发布时间:2019-09-06  |  【打印】 【关闭

  

报告人:盛永伟教授  加州大学洛杉矶分校(UCLA)地理系 

报告摘要: 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.

报告人简介 

  盛永伟教授,加州大学洛杉矶分校(UCLA)地理系教授,主要研究方向包括遥感、摄影测量、地理信息系统,及其在资源管理、环境分析及全球变化研究中的应用。早年毕业于浙江大学地球科学系遥感专业,分别于1988、1991获得学士和硕士学位,并于2000年获得加州大学伯克利分校环境科学及政策管理系博士学位。曾任教于纽约州立大学环境科学暨林业学院。在国际主要专业期刊上发表论文百篇,其中包括Science、Nature、PNAS等杂志,Nature曾报道他的研究成果。他近期的研究项目包括北极地区热融湖研究、青藏高原古湖泊及现代湖泊、中亚地区水资源,以及全球湖泊动态演变研究等等。他曾担任美国USGS/NASA Landsat系列卫星科学委员会委员,目前是NASA新一代海洋与水文卫星SWOT计划科学委员会成员。此外,还是中国科学院聘请的海外评审专家,2018/2019学年度作为特聘教授在中科院青藏高原研究所访学。 

主持人:苏奋振  研究员 

时  间:2019年9月12日(星期四)上午9:30 

地  点:中科院地理资源所A0212会议室