PROGRESS IN GEOGRAPHY ›› 2008, Vol. 27 ›› Issue (4): 15-22.doi: 10.11820/dlkxjz.2008.04.003

• Original Articles • Previous Articles     Next Articles

A Time Downscaling Scheme of Pr ecipitation by Using Geostationary Meteorological Satellite Data

SHI Chunxiang1,2,3, XIE Zhenghui1   

  1. 1. Institute of Atmosphere Physics, Chinese Academy of Science, Beijing 100029, China;
    2. National Satellite Meteorological Center, CMA, Beijing 100081, China;
    3. Graduate School of the Chinese Academy of Science, Beijing 100039, China
  • Received:2008-04-01 Revised:2008-06-01 Online:2008-07-25 Published:2008-07-25

Abstract:

Precipitation estimation with high quality and highresolution in time and space is significant for land model simulation, land data assimilation, and the weather, climate and environment research. To estimate precipitation distribution from rain gauge, the traditional methods interpolate the precipitation in space and time without considering the function of the cloud and discontinuity of precipitation incident in time and space. The paper develops a highresolution precipitation estimation scheme by using geostationary satellite data, which estimates six- hour resolution precipitation by using multi- channel satellite data and gauge data, and then interpolates the six- hour resolution precipitation into one- hour resolution precipitation by using cloud precipitation probability as weight. The newly developed method is applied to FY2C satellite data and its 6- hour resolution precipitation data to get one- hour resolution precipitation, and is validated again precipitation observation, which shows that the scheme is reasonable.

Key words: precipitation estimation, satellite data, spatial and temporal scale