Effects of Cloud Parameter on Brightness Temperature Computation in Microwave Band

Gu Chengming; Wang Yunfeng; Zhang Xiaohui; Zhong Bo; Ma Xinyuan

doi:10.11898/1001-7313.20160313

Vol.27, NO.3, 2016

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Article Navigation > Journal of Applied Meteorological Science > 2016 > 27(3): 380-384

Gu Chengming, Wang Yunfeng, Zhang Xiaohui, et al. Effects of cloud parameter on brightness temperature computation in microwave band. J Appl Meteor Sci, 2016, 27(3): 380-384. DOI: 10.11898/1001-7313.20160313.

Citation:

Gu Chengming, Wang Yunfeng, Zhang Xiaohui, et al. Effects of cloud parameter on brightness temperature computation in microwave band. J Appl Meteor Sci, 2016, 27(3): 380-384. DOI: 10.11898/1001-7313.20160313.

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Effects of Cloud Parameter on Brightness Temperature Computation in Microwave Band

DOI: 10.11898/1001-7313.20160313

Institute of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101

Received Date: 2015-09-11
Rev Recd Date: 2016-02-23
Publish Date: 2016-05-31

Abstract

Abstract

The CRTM fast radiative transfer model is utilized to simulate channel brightness temperature of NOAA-K/AMSU-A. The research focuses on effects of cloud particles type, height and thickness on simulation of each channel brightness temperature. Results show that when there exists water cloud and rain cloud, the corresponding brightness temperature is larger; when there exists ice cloud, snow cloud, hail cloud or graupel cloud, the change of corresponding brightness temperature isn't very obvious. Effects of cloud on channel brightness temperature depend on the configuration of weighting function peaks and cloud top height. When cloud exists at multiple heights, if topmost cloud is thicker (2 km), brightness temperature value of corresponding channels depends on the highest cloud. When the cloud is relative thin, brightness temperature of channels lower or slightly higher than cloud top changes obviously. For those channels far higher than cloud top, their brightness temperatures are not sensitive to cloud thickness change.
- CRTM;
- AMSU-A;
- cloud parameter;
- brightness temperature

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References(15)

Figures and Tables

图 1 美国标准大气廓线

Fig. 1 American standard atmospheric profiles

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图 2 存在低云时不同云粒子类型下通道1亮温

Fig. 2 Brightness temperature of the first channel with different cloud types when low cloud exists

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图 3 云高不同时的各通道亮温

Fig. 3 Channel brightness temperature of different cloud height

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图 4 云高不同时通道1上行辐射 (a) 分别存在3种云及晴空条件下，(b) 仅存在高云及存在3种云align="center"

Fig. 4 Upward radiance of the first channel of different cloud height (a) three-kind cloud and in clear sky, (b) three-kind cloud in the same time with high cloud only

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图 5 控制云底高度不变时改变云厚度的亮温与无云时亮温偏差

Fig. 5 Brightness temperature deviation of different thickness of cloud with no cloud given the same cloud bottom

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