Can liquid water profiles be retrieved from passive microwave zenith observations?

被引：35

作者：

Crewell, Susanne ^{[1
]}

Ebell, Kerstin ^{[1
]}

Loehnert, Ulrich ^{[1
]}

Turner, D. D. ^{[2
]}

机构：

[1] Univ Cologne, Inst Geophys & Meteorol, D-50674 Cologne, Germany

[2] Univ Wisconsin, Space Sci & Engn Ctr, Madison, WI 53706 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2009年 / 36卷

关键词：

CLOUD LIQUID; PATH; TEMPERATURE; RADIOMETRY; ACCURACY; VAPOR;

D O I：

10.1029/2008GL036934

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The ability to determine the cloud boundaries and vertical distribution of cloud liquid water for single-layer liquid clouds using zenith-pointing microwave radiometers is investigated. Simulations are used to demonstrate that there is little skill in determining either cloud base or cloud thickness, especially when the cloud thickness is less than 500 m. It is also shown that the different distributions of liquid water content within a cloud with known cloud boundaries results in a maximum change in the brightness temperature of less than 1 K at the surface from 20 to 150 GHz, which is on the order of the instrument noise level. Furthermore, it is demonstrated using the averaging kernel that the number of degrees of freedom for signal (i.e., independent pieces of information) is approximately 1, which implies there is no information on vertical distribution of liquid water in the microwave observations. Citation: Crewell, S., K. Ebell, U. Lohnert, and D. D. Turner (2009), Can liquid water profiles be retrieved from passive microwave zenith observations?, Geophys. Res. Lett., 36, L06803, doi: 10.1029/2008GL036934.

引用

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