卷云高度对大气的红外光谱辐射影响的研究
Study of the effects of cirrus altitude on the atmospheric infrared spectral radiation
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摘要: 利用通用大气辐射传输软件(CART)计算了不同高度卷云大气红外光谱辐射亮温，着重分析了卷云高度对不同红外波段红外亮温谱、卷云有效尺度以及光学厚度反演的影响。研究发现：对流层顶以下，大气窗口波段的亮温随着卷云高度的变化和大气温度廓线基本一致，790~960 cm-1波段亮温的斜率随卷云高度的增加而变大。亮温差BTD[900~1 231 cm-1]对薄卷云和小的有效尺度随卷云高度的变化较明显。对于厚卷云，亮温差BTD[900~1 559 cm-1]随卷云高度的变化基本上不依赖于卷云有效尺度和光学厚度。在卷云参数的光学定量遥感中需考虑卷云高度变化的影响。
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关键词:
- 卷云高度 /
- 通用大气辐射传输软件 /
- 红外光谱
Abstract: The brightness temperatures of IR spectral radiation of cirrus atmosphere with different cirrus altitude were computed by a combined atmospheric radiative transfer (CART) model. The effects of cirrus altitude on brightness temperature spectra of different IR bands and on the retrieval of optical thickness and effective size of cirrus were analyzed. The results show that the variation of IR brightness temperature with cirrus altitude in the atmospheric window region is consistent with the atmospheric temperature profile below the tropopause. The slope of the brightness temperature from 790 cm-1 to 960 cm-1 bands increases with the altitude of cirrus clouds. Variation of brightness temperature difference between 900 cm-1 and 1 231 cm-1 bands to cirrus altitude is sensitive to thin cirrus and small effective size. Variation of brightness temperature difference between 900 cm-1and 1 559 cm-1 bands to cirrus altitude is basically not dependent on effective size and optical thickness for thick cirrus. Thus, the effects of cirrus altitude on the remote sensing of optical quantitation of cirrus parameters should be considered.-
Key words:
- cirrus altitude /
- CART /
- IR spectra
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