Retrieval of the Optical Thickness and Cloud Top Height of Cirrus Clouds Based on AIRS IR High Spectral Resolution Data
CAO Ya-nan1, 2, WEI He-li1, 3*, DAI Cong-ming1, ZHANG Xue-hai1, 2
1. Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China 2. University of Chinese Academy of Sciences, Beijing 100049, China 3. School of Environmental Sciences and Optoelectronic Technology, University of Science and Technology of China, Hefei 230031, China
Abstract：A study was carried out to retrieve optical thickness and cloud top height of cirrus clouds from the Atmospheric Infrared Sounder (AIRS) high spectral resolution data in 1 070~1 135 cm-1 IR band using a Combined Atmospheric Radiative Transfer model (CART) by brightness temperature difference between model simulation and AIRS observation. The research is based on AIRS L1B high spectral infrared observation data combined with Moderate Resolution Imaging Spectroradiometer (MODIS) cloud product data. Brightness temperature spectra based on the retrieved cirrus optical thickness and cloud top height were simulated and compared with brightness temperature spectra of AIRS observation in the 650~1 150 cm-1 band. The cirrus optical thickness and cloud top height retrieved were compared with brightness temperature of AIRS for channel 760 (900.56 cm-1, 11.1 μm) and cirrus reflectance of MODIS cloud product. And cloud top height retrieved was compared with cloud top height from MODIS. Results show that the brightness temperature spectra simulated were basically consistent with AIRS observation under the condition of retrieval in the 650~1 150 cm-1 band. It means that CART can be used to simulate AIRS brightness temperature spectra. The retrieved cirrus parameters are consistent with brightness temperature of AIRS for channel 11.1 μm with low brightness temperature corresponding to large cirrus optical thickness and high cloud top height. And the retrieved cirrus parameters are consistent with cirrus reflectance of MODIS cloud product with high cirrus reflectance corresponding to large cirrus optical thickness and high cloud top height. Correlation coefficient of brightness temperature between retrieved cloud top height and MODIS cloud top height was relatively high. They are mostly located in the range of 8.5~11.5 km, and their probability distribution trend is approximately identical. CART model is feasible to retrieve cirrus properties, and the retrieval is reliable.
Key words：Cirrus clouds;IR high spectra;AIRS;Optical thickness;Cloud top height;Retrieval
曹亚楠1, 2，魏合理1, 3*，戴聪明1，张学海1, 2 . AIRS红外高光谱卫星数据反演卷云光学厚度和云顶高度 [J]. 光谱学与光谱分析, 2015, 35(05): 1208-1213.
CAO Ya-nan1, 2, WEI He-li1, 3*, DAI Cong-ming1, ZHANG Xue-hai1, 2 . Retrieval of the Optical Thickness and Cloud Top Height of Cirrus Clouds Based on AIRS IR High Spectral Resolution Data . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(05): 1208-1213.
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