平流层大气温度探测通道选择数值试验

NUMERICAL SIMULATION EXPERIMENT ON THE EQUIVALENT CHANNEL SELECTION FOR STRATOSPHERIC SOUNDING

通过等效通道选择原理分析，认为通过构建等效通道，可使其权重函数峰值高度高于目前美国ＮＯＡＡ气象卫星ＨＩＲＳ／２第一通道的峰值高度．通过大量的模拟计算试验，证实了这一原理实现的可能性．进一步利用１５μｍＣＯ２吸收带的７个温度探测通道和所选择的等效通道一起反演大气温度垂直分布，结果表明增加一个等效通道对温度廓线反演有一定改善，特别是对平流层（５０～２ｈＰａ）温度反演，平均每层精度提高约０．２７Ｋ．

It was thought that an equivalent atmospheric sounding channel can be obtained by a lot of simulated computation, of which the peak height weighting function is higher than that of the first channel of HIRS/2 instrument onboard the NOAA serial meteorological satellites of USA.By comparing the retrievals obtained from the equivalent channel with original retrievals, the result shows that there is an improvement on the temperature retrievals by adding the equivalent channels, particularly on stratosphere (50-2hPa) profiles with the average improvement of 0.27K.