摘要
为研究微波亮温资料在反演陆地和海洋降水中的效果和差异,利用TRMM卫星的PR（2A25）和TMI（1B11）资料,从1998～2004年的观测资料中,每年分别选取了一次陆地和海洋上的强降水个例,采用4种组合方案进行了TMI反演降水试验.结果表明,无论是洋面降水还是陆地降水,采用全通道的组合方案都是最佳的.全通道的对数组合方案是反演洋面降水的一种理想方法.而对于陆地降水,全通道直接组合方案在总体上体现了较强的优势,是反演陆地降水的一种较为理想的方法,同时尽管陆面发射率高,往往淹没低频信号,但高、低频微波通道组合的反演结果仍优于单独使用高频亮温通道组合的反演结果.
With focus on the research of the effect and diversity by the microwave brightness temperature data in the retrieval of heavy rainfall over land and ocean, the precipitation rate from TRMM/PR and the microwave brightness temperature data from TRMM/TMI were used in the retrieval of heavy rainfall over land and ocean for a total of 14 cases from 1998 to 2004. Four retrieval schemes were conducted respectively. The results show that the combination scheme with total channel brightness temperature is better than that with high-frequency data for the precipitation whether over land or over ocean. The total channel logarithm combination scheme （TLC） is bether over ocean, whereas the total channel direct combination scheme （TDC） is more practicable in precipitation retrieval over land. It suggests that the multi-channel combination scheme is better for precipitation retrieval over land than that with high-frequency data only, though the land surface emissivity is high and the low frequency signal may be submerged by land clutter.
出处
《解放军理工大学学报（自然科学版）》
EI
2006年第2期200-204,共5页
Journal of PLA University of Science and Technology(Natural Science Edition)
关键词
热带测雨卫星
微波成像仪
降水雷达
反演
TRMM（tropical rainfall measuring mission）
microwave imager
precipitation radar
retrieval
