Improvement of snow depth retrieval for FY3B-MWRI in China

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• 作者：LingMei Jiang (1)
  Pei Wang (1)
  LiXin Zhang (1)
  Hu Yang (2)
  JunTao Yang (1)
  
• 关键词：snow depth ; passive microwave ; FY3B ; MWRI ; China
• 刊名：Science China Earth Sciences
• 出版年：2014
• 出版时间：June 2014
• 年：2014
• 卷：57
• 期：6
• 页码：1278-1292
• 全文大小：
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• 作者单位：LingMei Jiang (1)
  Pei Wang (1)
  LiXin Zhang (1)
  Hu Yang (2)
  JunTao Yang (1)
  
  1. State Key Laboratory of Remote Sensing Science, School of Geography, Beijing Normal University, Beijing, 100875, China
  2. National Satellite Meteorological Center, China Meteorological Administration, Beijing, 100081, China
  
• ISSN：1869-1897

文摘

The primary objective of this work is to develop an operational snow depth retrieval algorithm for the FengYun3B Microwave Radiation Imager (FY3B-MWRI) in China. Based on 7-year (2002-009) observations of brightness temperature by the Advanced Microwave Scanning Radiometer-EOS (AMSR-E) and snow depth from Chinese meteorological stations, we develop a semi-empirical snow depth retrieval algorithm. When its land cover fraction is larger than 85%, we regard a pixel as pure at the satellite passive microwave remote-sensing scale. A 1-km resolution land use/land cover (LULC) map from the Data Center for Resources and Environmental Sciences, Chinese Academy of Sciences, is used to determine fractions of four main land cover types (grass, farmland, bare soil, and forest). Land cover sensitivity snow depth retrieval algorithms are initially developed using AMSR-E brightness temperature data. Each grid-cell snow depth was estimated as the sum of snow depths from each land cover algorithm weighted by percentages of land cover types within each grid cell. Through evaluation of this algorithm using station measurements from 2006, the root mean square error (RMSE) of snow depth retrieval is about 5.6 cm. In forest regions, snow depth is underestimated relative to ground observation, because stem volume and canopy closure are ignored in current algorithms. In addition, comparison between snow cover derived from AMSR-E and FY3B-MWRI with Moderate-resolution Imaging Spectroradiometer (MODIS) snow cover products (MYD10C1) in January 2010 showed that algorithm accuracy in snow cover monitoring can reach 84%. Finally, we compared snow water equivalence (SWE) derived using FY3B-MWRI with AMSR-E SWE products in the Northern Hemisphere. The results show that AMSR-E overestimated SWE in China, which agrees with other validations.