摘要
本文用改进的经验正交函数(EOF)展开法和卫星高级微波探测器(AMSU)中6个O_25mm通道的辐亮温模拟值进行反演大气温度垂直分布的实验。结果表明,地面温度可使500hPa以下的反演结果改进达1K左右。反演结果中的误差均方根,在850hPa处较大为2.3K,无偏均方根为2.2K;在150hPa附近最大为3.0K,无偏均方根为2.2K。30hPa高度以下的均方根误差的总平均为2.2K,无偏均方根误差总平均为1.8K。
A numerical experiment is performed to retrieve the vertical profiles of the atmospheric temperature from the simulated brightness temperatures observed by a 6-channel 5 mm radiometer which operates in the same way as a part of the future satellite-based Advanced Microwave Sounding Unit (AMSU). The surface air temperature can modify the normal Empirical Othogonal Function (EOF) inversion method,resulting in statistically an improvement of about 1 K in retrievals below 500 hPa According to the error statistics in 120 profile retrievals in Nanjing, the vertical distribution of root mean square(RMS) differences between retrievals and radiosondes has a maximum of 3.0 K at about 150 hPa and a peak of 2.3 K at 850 hPa, and the unbiased RMS differences at these two levels are 2.4 and 2.2 K respectively. The average at 14 pressure Ievels below 30 hPa is 2.2 K for RMS and 1.8 K for unbiased RMS
出处
《南京气象学院学报》
CSCD
1990年第3期410-416,共7页
Journal of Nanjing Institute of Meteorology
