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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Some considerations on the infrared cloud forcing - art. no. 4403
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Some considerations on the infrared cloud forcing - art. no. 4403

机译：关于红外云强迫的一些考虑因素-艺术。没有。 4403

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1] Long-wave spectral cloud forcing is computed for realistic clouds of various optical thickness embedded in the tropical and subarctic winter standard atmospheres. The strict connections between the integrated long-wave cloud forcing (LCF) and cloud's altitude and transmissivity are shown. LCF, especially in presence of ice clouds, grows almost linearly with cloud transmissivity, and largest values are found in presence of high and opaque cirri. We have also considered the effect of incomplete spectral coverage in broadband long-wave radiometry when estimating LCF. The error has been computed as a function of edge cutoff (two different filters are used) and cloud's transmissivity and top altitude. Uncorrected measurements from sensors with incomplete spectral coverage generally underestimate the real LCF, especially for the highest cirrus clouds in the tropics. A correction is possible since the percentage error is practically constant with cloud's transmissivity. [References: 25
机译：1]计算了在热带和亚北极冬季标准大气中嵌入的各种光学厚度的现实云的长波光谱云强迫。显示了集成长波云强迫（LCF）与云的高度和透射率之间的严格联系。 LCF尤其是在冰云的存在下，LCF与云的透射率几乎呈线性增长，并且在存在高且不透明的卷云时发现最大值。在估算LCF时，我们还考虑了宽带长波辐射测量中光谱覆盖不完全的影响。该误差是根据边缘截止（使用两个不同的滤波器）以及云的透射率和最高海拔而计算的。来自光谱覆盖范围不完整的传感器的未经校正的测量值通常会低估实际的LCF，尤其是对于热带地区最高的卷云而言。由于百分比误差实际上与云的透射率恒定，因此可以进行校正。 [参考：25

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