The effect of the half-width of the 22-GHz water vapor line on retrievals of temperature and water vapor profiles with a 12-channel microwave radiometer

被引:112
作者
Liljegren, JC
Boukabara, SA
Cady-Pereira, K
Clough, SA
机构
[1] Argonne Natl Lab, Argonne, IL 60439 USA
[2] Atmospher & Environm Res Inc, Lexington, MA 02421 USA
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 2005年 / 43卷 / 05期
关键词
microwave remote sensing; spectroscopy; thermodynamic profile retrieval; water vapor absorption;
D O I
10.1109/TGRS.2004.839593
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
We show that observed biases in retrievals of temperature and water vapor profiles from a 12-channel microwave radiometer arise from systematic differences between the observed and model-calculated brightness temperatures at five measurement frequencies between 22 and 30 GHz. Replacing the value for the air-broadened half-width of the 22-GHz water vapor line used in the Rosenkranz absorption model with the 5% smaller half-width from the HITRAN compilation largely eliminated the systematic differences in brightness temperatures. An a priori statistical retrieval based on the revised model demonstrated significant improvements in the accuracy and vertical resolution of the retrieved temperature and water vapor profiles. Additional improvements were demonstrated by combining the MWRP retrievals with those from the GOES-8 sounder and by incorporating brightness temperature measurements at off-zenith angles in the retrievals.
引用
收藏
页码:1102 / 1108
页数:7
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