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首页> 外文期刊>Geophysical Research Letters >Retrieval of upper tropospheric relative humidity profiles over low clouds from the Atmospheric Infrared Sounder
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Retrieval of upper tropospheric relative humidity profiles over low clouds from the Atmospheric Infrared Sounder

机译:从大气红外测深仪反演低层云层上方对流层相对湿度廓线

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摘要

In this paper we discuss a method to retrieve humidity profiles in the upper troposphere using cloud-affected radiances measured by the Atmospheric Infrared Sounder (AIRS). The magnitude of retrieval error for temperature and water vapor profiles caused by ignoring cloud presence depends strongly on the height of clouds as well as on the cloud fraction in the sensor's field of view. Error analysis based on radiative transfer calculations performed for 155 channels using a set of diverse atmospheric profiles shows that the relative humidity in the upper troposphere at pressure levels between 200 and 400 hPa could be estimated if the cloud height was lower than the height of the 800 hPa pressure level. Applying the channel ranking technique to evaluate the cloud influence in the observed spectra, we examined a high-resolution humidity map of the upper troposphere over land and sea.
机译:在本文中,我们讨论了一种利用大气红外测深仪(AIRS)测量的受云影响的辐射来检索对流层上部湿度剖面的方法。由于忽略云的存在而导致的温度和水汽剖面的检索误差大小,在很大程度上取决于云的高度以及传感器视场中的云分数。基于155个通道的辐射传递计算的误差分析,使用一组不同的大气廓线表明,如果云层高度低于800的高度,则可以估计200至400 hPa之间压力水平上对流层的相对湿度。 hPa压力水平。应用通道分级技术评估观测光谱中云的影响,我们检查了陆地和海洋上对流层的高分辨率湿度图。

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