摘要
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、卫星产品评估与土壤水分反演算法发展等方面系统回顾和总结了近年来L波段被动微波遥感及其土壤水分反演算法、产品在青藏高原的主要应用与研究进展。在此基础上,归纳了当前高原L波段被动微波辐射模拟与土壤水分反演存在的问题,主要包括缺乏高原尺度的微波辐射模拟评估和改进的卫星土壤水分产品、土壤冻结时期的水分监测产品依然缺失等问题。针对存在的问题,进一步提出了相关建议与展望,建议今后的研究应加强高原尺度的微波辐射模拟评估与土壤水分产品改进工作,并积极拓展土壤水分产品在高原水分循环和能量平衡模拟、植被生长与干旱监测的应用研究。
Soil moisture is a key variable in quantifying water and heat exchanges between land surface and atmo⁃sphere,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 im⁃prove the simulation of water and energy budgets on the plateau.After the launch of SMOS and SMAP satel⁃lites,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 tem⁃perature based on ground-,aircraft-based and spaceborne platforms,development of regional-scale soil mois⁃ture 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 pla⁃teau scale,and to enlarge the applications of soil moisture products,such as to improve the understanding of pla⁃teau-scale water and energy budgets,vegetation growth and drought monitoring.
作者
杨奥莉
郑东海
文军
陆宣承
杨越
符晴
Yang Aoli;Zheng Donghai;Wen Jun;Lu Xuancheng;Yang Yue;Fu Qing(School of Atmospheric Sciences,Chengdu University of Information Technology,Plateau Atmosphere and Environment Key Laboratory of Sichuan province,Chengdu 610000,China;National Tibetan Plateau Data Center,State Key Laboratory of Tibetan Plateau Earth System Science,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China;College of Atmospheric Sciences,Lanzhou University,Lanzhou 730000,China)
出处
《遥感技术与应用》
CSCD
北大核心
2021年第5期983-996,共14页
Remote Sensing Technology and Application
基金
国家自然科学基金面上项目(41971308、41871273)
成都信息工程大学(KTVZ201821)。
关键词
L波段被动微波遥感
土壤水分反演
微波辐射观测与模拟
冻土
青藏高原
L-band Passive Microwave Remote Sensing
Soil moisture retrieval
Microwave radiometry obser⁃vation and simulation
Frozen soil
Tibetan Plateau
作者简介
杨奥莉(1996-),女,四川资阳人,硕士研究生,主要从事微波遥感的研究。E⁃mail:2287622439@qq.com;通讯作者:郑东海(1986-),男,福建泉州人,研究员,主要从事陆面水文、微波辐射过程观测与模拟的研究。E⁃mail:zhengd@itpcas.ac.cn。
