报告题目：Monitoring of northern hemisphere seasonal snow cover: long term trends and emerging methodologies

　　报告人：Juha Lemmetyinen

　　邀请人：蒋玲梅 副教授

　　时间：2017年12月28日14:00

　　地点：北师大生地楼180会议室

　　报告人简介：

　　Dr. Juha Lemmetyinen is the group leader of Cryosphere processes and satellite observations in the Finnish Meteorological Institute (FMI) . He has over ten years of work experience in the field of Earth Observation. He has been with FMI since 2008, specializing in modelling of microwave signatures and development of retrieval algorithms for active and passive microwave remote sensing, with focus on cryosphere applications. At FMI, he has acted as Principal Investigator for several studies funded by e.g. the European Space Agency (ESA) related to cryosphere remote sensing. His current research interests include modelling of microwave interactions with snow cover, soil and vegetation, and development of cryosphere applications for future satellite missions. Since 2014, he leads the Cryospheric Processes group at FMI. As of April 2017, he is a visiting scientist at the Chinese Academy of Sciences, Institute of Remote Sensing and Digital Earth, under the CAS President‘s International Fellowship Initiative. He has authored and co-authored over 50 peer-reviewed journal articles on remote sensing.

　　主要内容：        

　　Seasonal snow cover is a key component of the terrestrial cryosphere, affecting the energy balance of the Earth, regional water resources and boundary conditions for carbon exchange. Seasonal snow occurs on approximately 50 % of the land mass in the Northern Hemisphere; due to harsh conditions and typically sparse of infrastructure, remote sensing presents a viable method for monitoring snow cover properties. While monitoring of snow cover extent is relatively well established, challenges remain in particular regarding the monitoring of the total amount of water stored in snow, or snow mass. This presentation gives an overview of trends in seasonal snow cover as observed by Earth Observing satellites; the most promising techniques for resolving the main open question related to snow cover properties, i.e. the monitoring of Snow Water Equivalent (SWE) at hemispheric scales, is also discussed.