| 提高“К分布法”计算遥感通道透过率精度的方法 |
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| 引用本文： | 尹宏.提高“К分布法”计算遥感通道透过率精度的方法[J].应用气象学报,2005,16(6):811-819. |
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| 作者姓名： | 尹宏 |
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| 作者单位： | 北京大学物理学院大气科学系 北京 100871 |
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| 摘 要： | 卫星测量地面或云面反射的氧气0.76μm吸收带一些通道的太阳辐亮度，可遥测洋面或地面气压场及云顶气压。由于洋面或地面气压相对变化约10-3量级，用“К分布法”计算氧气通道透过率要求较高的精度和速度。提高“К分布法”计算精度的途径是:①减少产生误差的简化计算；②增加截点数，特别是波段内吸收线较多、吸收系数变化较复杂的通道。假设在卫星上用干涉光谱仪测量氧气0.76μm吸收带一些通道的带宽均为1cm-1，在12930~13220cm-1范围内，选190个波段，计算不同温度廓线下通道的平均透过率。大部分通道“К分布法”的截点数N≤20，个别通道氧气吸收线较多，吸收系数变化较复杂，为了使“К分布法”通道平均透过率的计算误差小于10-4，需增加通道内截点数N，N最多为136，与逐线计算结果相比，通道垂直透过率的最大均方差小于3×10-5。计算透过率的速度和精度都满足反演计算的要求。
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| 关 键 词： | 氧气0.76μm通道 透过率 К分布法 |
| 收稿时间： | 2004-11-08 |
| 修稿时间： | 2005-07-12 |
Improvement of K-Distribution Precision for Calculating the Transmission of Satellite Remote Sensing Channel |
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| Yin Hong.Improvement of K-Distribution Precision for Calculating the Transmission of Satellite Remote Sensing Channel[J].Quarterly Journal of Applied Meteorology,2005,16(6):811-819. |
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| Authors: | Yin Hong |
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| Affiliation: | Department of Atmospheric Science, Peking University, Beijing 100871 |
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| Abstract: | The absorption band of oxygen at 0.76μm may be used for satellite remote sensing pressure of ocean, earth and cloud surface. The relative variation of pressure is about 10-3, so the precision of vertical transmission calculated by k-distribution method must be less than 10-3. According to the increase of computer velocity, the way to increase the precision of vertical transmission calculated by k-distribution method includes: (1) decreasing the simplify calculating processes, (2) when the variation of absorption coefficient is complicated in the channel, increasing the number of sectional points. The extreme number of sectional points is 136, the extreme stand error of vertical transmission calculated by k-distribution method is less than 3×10-5 |
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