Cloud optical thickness and effective particle radius derived from transmitted solar radiation measurements: Comparison with cloud radar observations

被引:31
|
作者
Kikuchi, N
Nakajima, T
Kumagai, H
Kuroiwa, H
Kamei, A
Nakamura, R
Nakajima, TY
机构
[1] Natl Inst Informat & Commun Technol, Tokyo 1848795, Japan
[2] Univ Tokyo, Ctr Climate Syst Res, Chiba 2778568, Japan
[3] Natl Inst Environm Studies, Tsukuba, Ibaraki 3058505, Japan
[4] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan
[5] Tokai Univ, Sch Engn 2, Dept Network & Comp Engn, Shibuya Ku, Tokyo 1510063, Japan
关键词
D O I
10.1029/2005JD006363
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
[1] A method is presented for determining the optical thickness and effective particle radius of stratiform clouds containing liquid water drops in the absence of drizzle from transmitted solar radiation measurements. The procedure compares measurements of the cloud transmittance from the ground at water-absorbing and nonabsorbing wavelengths with lookup tables of the transmittance precomputed for plane-parallel, vertically homogeneous clouds. The optical thickness derived from the cloud transmittance may be used to retrieve vertical profiles of cloud microphysics in combination with the radar reflectivity factor. To do this, we also present an algorithm for solving the radar equation with a constraint of the optical thickness at the visible wavelength. Observations of clouds were made in August and September 2003 at Koganei, Tokyo, Japan, using a PREDE i-skyradiometer and a 95-GHz cloud radar Super Polarimetric Ice Crystal Detection and Explication Radar ( SPIDER). The optical thickness and effective radius of water clouds were derived from the i-skyradiometer. Then, the vertical profile of the effective radius was retrieved from SPIDER, using the optical thickness determined from the i-skyradiometer. We found that the effective radii derived by using these two instruments were in good agreement.
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页数:10
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