青藏高原L波段微波辐射观测与土壤水分反演研究进展

土壤水分是地气间水热交换的重要变量,影响着地表感热潜热划分、水分收支和植被蒸腾等过程,青藏高原土壤水分的研究对于改进高原水分循环和能量平衡的模拟研究具有重要意义.随着SMOS、SMAP等卫星的发射,L波段被动微波遥感技术成为大尺度监测土壤水分的主要手段.分别从L波段星—机—地观测与微波辐射模拟、区域尺度土壤水分观测、卫...

Progress on L-band Microwave Radiometry Observation and Soil Moisture Retrieval over the Tibetan Plateau

Soil moisture is a key variable in quantifying water and heat exchanges between land surface and atmosphere， which also affects the partitioning of surface sensible and latent heat fluxes， and estimations of water budget and vegetation transpiration. Study of soil moisture on the Tibetan Plateau is of great significance to improve the simulation of water and energy budgets on the plateau. After the launch of SMOS and SMAP satellites， L-band passive microwave remote sensing has become the main way of monitoring soil moisture at large scale. This paper reviews and summarizes recent progresses on the L-band microwave radiometry observation and soil moisture retrieval over the Tibetan Plateau， including measurements and simulations of brightness temperature based on ground-， aircraft-based and spaceborne platforms， development of regional-scale soil moisture monitoring networks， evaluation of satellite products and development of soil moisture retrieval algorithms. Based on the reviews， we summarize the main problems exist currently on simulating the L-band microwave emission and retrieving soil moisture on the plateau， such as lack of evaluating microwave emission simulation and improving satellite-based soil moisture retrievals at plateau scale， and absence of soil moisture products for frozen soil conditions. In view of above existing problems， this paper further suggests that future work should pay more attention to improve the L-band microwave emission simulation and soil moisture retrievals at the plateau scale， and to enlarge the applications of soil moisture products， such as to improve the understanding of plateau-scale water and energy budgets， vegetation growth and drought monitoring.