| 计算HIRS/2通道透过率的指数和模式 |
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| 引用本文： | 金心,尹宏.计算HIRS/2通道透过率的指数和模式[J].应用气象学报,1996,7(1):96-102. |
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| 作者姓名： | 金心 尹宏 |
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| 作者单位： | 1.空军第七研究所，北京大学地球物理系 |
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| 摘 要： | 气象卫星HIRS/2各通道的吸收系数，透过率及权重函数与温度廓线一样随地点与时间而变化。把石广玉提出的指数和模式加上各通道仪器响应函数的修正，得出适合气象卫星HIRS/2各通道不同气体吸收系数的指数和模式，可以较快地计算HIRS/2各通道不同温度廓线下的透过率与权重函数。用修正的指数和模式计算CO2一些通道的透过率，与精确的逐线积分法的计算结果相比，CO2通道绝对差值小于0.0036；水汽1364 cm-1通道绝对差值小于0.0035。
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| 关 键 词： | 透过率 指数和模式 响应函数的修正 |
Calculation of HIRS/2 Channel Transmittances by the Exponential Sum Fitting of Transmission Model |
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| Jin Xin.Calculation of HIRS/2 Channel Transmittances by the Exponential Sum Fitting of Transmission Model[J].Quarterly Journal of Applied Meteorology,1996,7(1):96-102. |
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| Authors: | Jin Xin |
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| Institution: | 1.1) (Aviation Meteorological Research Institute, Beijing 100085); 2) (Department of Geophysics, Peking University, Beijing 100871) |
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| Abstract: | The absorption coefficient, transmittance and weighting function of the channels of HIRS/2 depend on the temperature profile which varies with the location and/or time in turn. An improved ESFT (the Exponential Sum Fitting of Transmission)model suitable for calculating the HIRS/2 channel transmittance has been obtained by adding the instrument weighting function to the ESFT model proposed by Shi Guang-Yu. With this.new ESFT model, the variations of transmittance and weighting function with the temperature can be calculated efficiently' Comparing with the exact line-by-line calculations,the results obtained show that the maximum absolute error in transmittance for CO, channels is smaller than 0. 0036,and that for the H,O channel is smaller than 0. 0035. |
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| Keywords: | Transmittance ESFT model Modification of the response function |
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