Radiative forcing by tropospheric ozone: Impact of cloud representation
Radiative forcing by tropospheric ozone: Impact of cloud representation
复制标题
对流层臭氧的辐射强迫：云表示的影响
DOI：
10.1029/1999gl900029
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
G. Roelofs
中科院分区：
文献类型：
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作者：
G. Roelofs
我们使用大气环流模式ECHAM 4研究了前工业化时期和现在之间云对对流层臭氧增加的辐射强迫的影响。结果表明，云对晴空条件下长波强迫的衰减约为20%，而对短波强迫的衰减约为两倍。总的晴空和多云强迫分别为0.41和0.37 W m−2。对报告的强迫估计的分析表明，长波云效应的量级是晴空长波强迫的20-30%。另一方面，短波云效应似乎在很大程度上取决于所应用的云分布特征和辐射传输模式中云的处理方式，并且在晴空短波强迫的30-250%之间变化。因此，目前对云效应的估计范围从零到高达0.1 W m−2。
We investigate the effect of clouds on the radiative forcing by tropospheric ozone increases between the pre‐industrial and the present time, using the general circulation model ECHAM4. The results indicate that clouds attenuate the longwave forcing for clear sky conditions by about 20%, whereas it approximately doubles the shortwave forcing. The estimated total clear‐sky and cloudy‐sky forcings are 0.41 and 0.37 W m−2, respectively. Analysis of reported forcing estimates shows that the magnitude of the longwave cloud effect is 20–30% of the clear‐sky longwave forcing. On the other hand, the shortwave cloud effect appears to depend largely on characteristics of the applied cloud distribution and the way clouds are treated in radiative transfer models, and varies between 30–250% of the clear‐sky shortwave forcing. Hence, present estimates of the cloud effect range from zero to as high as 0.1 W m−2.