Daily snow water equivalent product with SMMR,SSM/I and SSMIS from 1980 to 2020 over China  

作　　者：Lingmei Jiang Jianwei Yang Cheng Zhang Shengli Wu Zhen Li Liyun Dai Xiaofeng Li Yubao Qiu 

机构地区：[1]State Key Laboratory of Remote Sensing Science,Jointly Sponsored by Beijing Normal University and Aerospace Information Research Institute of Chinese Academy of Sciences,Faculty of Geographical Science,Beijing Normal University,Beijing,China [2]National Satellite Meteorological Center,China Meteorological Administration,Beijing,China [3]Key Laboratory of Digital Earth Science,Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing,China [4]Key Laboratory of Remote Sensing of Gansu Province,Heihe Remote Sensing Experimental Research Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,China [5]Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun,China

出　　处：《Big Earth Data》2022年第4期420-434,共15页地球大数据（英文）

基　　金：supported by the Science and Technology Basic Resources Investigation Program of China(2017FY100502);the National Natural Science Foundation of China(42090014,42171317).

摘　　要：The reliable knowledge of seasonal snow volume and its trend is very important to understand Earth’s climate system.Thus,a long-time snow water equivalent(SWE)dataset is necessary.This work presents a daily SWE product of 1980-2020 with a linear unmixing method through passive microwave data including SMMR,SSM/I and SSMIS over China after cross-calibration and bias-correction.The unbiased root-mean-square error of snow depth is about 5-7 cm,corresponding to 10-15 mm for SWE,when compared with stations measurements and field snow course data.The spatial patterns and trends of SWE over China present significant regional differences.The overall slope trend presented an insignificant decreasing pattern during 1980-2020 over China;however,there is an obvious fluctuation,i.e.a significant decrease trend during the period 1980-1990,an upward trend from 2005 to 2009,a significant downward trend from 2009 to 2018.The increase of SWE occurred in the Northeast Plain,with an increase trend of 0.2 mm per year.Whereas in the Hengduan Mountains,it presented a downward trend of SWE,up to−0.3 mm per year.In the North Xinjiang,SWE has an increasing trend in the Junggar Basin,while it shows a decreasing trend in the Tianshan and Altai Mountains.

关 键 词：Snow water equivalent DAILY 1980-2020 passive microwave remote sensing China 

分 类 号：P46[天文地球—大气科学及气象学]