Assimilation of Feng-Yun-3B Satellite Microwave Humidity Sounder Data over Land
Assimilation of Feng-Yun-3B Satellite Microwave Humidity Sounder Data over Land
复制标题
风云三号B卫星微波湿度探测仪陆地数据同化
DOI：
10.1007/s00376-017-7088-0
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Jiang Zhu
中科院分区：
文献类型：
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作者：
Keyi Chen;Niels Bormann;Stephen English;Jiang Zhu
自2014年9月24日以来，欧洲中央气象中心一直将风云3b （FY-3B）卫星微波湿度测深仪（MWHS）的海上数据同化到一个业务预报系统中。然而，吸收陆地和海冰上的微波观测比吸收公海上的微波观测更困难，因为陆地表面温度、表面发射率的不确定性更高，云层屏蔽的效果也更差。我们比较了从MWHS通道1 [150 GHz（垂直极化）]动态获取发射率的方法，以及使用NOAA和EUMETSAT卫星上MWHS的89 GHz观测数据的不断发展的发射率图谱。陆地上额外资料的同化改善了短期预报与其他观测的拟合，特别是与ATMS （Advanced Technology Microwave Sounder）湿度通道的拟合，预报影响在前5天主要为中性或微正。预报效果在北半球夏季和南半球较好。这些结果表明，所测试的技术可以有效地同化陆地上的MWHS/FY-3B数据。
The ECMWF has been assimilating Feng-Yun-3B (FY-3B) satellite microwave humidity sounder (MWHS) data over the sea in an operational forecasting system since 24 September 2014. It is more difficult, however, to assimilate microwave observations over land and sea ice than over the open ocean due to higher uncertainty in land surface temperature, surface emissivity and less effective cloud screening. We compare approaches in which the emissivity is retrieved dynamically from MWHS channel 1 [150 GHz (vertical polarization)] with the use of an evolving emissivity atlas from 89 GHz observations from the MWHSs onboard NOAA and EUMETSAT satellites. The assimilation of the additional data over land improves the fit of short-range forecasts to other observations, notably ATMS (Advanced Technology Microwave Sounder) humidity channels, and the forecast impacts are mainly neutral to slightly positive over the first five days. The forecast impacts are better in boreal summer and the Southern Hemisphere. These results suggest that the techniques tested allow for effective assimilation of MWHS/FY-3B data over land.