An estimate of the global impact of multiple scattering by clouds on outgoing long‐wave radiation
An estimate of the global impact of multiple scattering by clouds on outgoing long‐wave radiation
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DOI：
10.1256/qj.05.169
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发表时间：
2006-04
影响因子：
8.9
通讯作者：
Simone M. Costa;K. Shine
中科院分区：
文献类型：
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作者：
Simone M. Costa;K. Shine
尽管人们已经认识到云散射长波辐射的潜在重要性，但大多数研究都集中在高云的影响上，并且很少对散射的全球影响进行估计。这项研究表明，低云中的散射对柱状水蒸气相对较低的海洋层积云区域（阴天条件下为-3.5 W m−2）的出射长波辐射（OLR）有显着影响。这相当于此类云的温室效应增强了 10%。散射对 OLR 的近全球影响估计为 -3.0 W m−2，其中低云贡献 -0.9 W m−2，中层云贡献 -0.7 W m−2，高云贡献 -1.4 W m−2。尽管与全球平均OLR 240 W m−2 相比，这种效应显得较小，但这表明忽略散射将导致云长波强迫误差约10%，净云强迫误差约20%。版权所有© 2006 英国皇家气象学会。
Although the potential importance of scattering of long‐wave radiation by clouds has been recognised, most studies have concentrated on the impact of high clouds and few estimates of the global impact of scattering have been presented. This study shows that scattering in low clouds has a significant impact on outgoing long‐wave radiation (OLR) in regions of marine stratocumulus (−3.5 W m−2 for overcast conditions) where the column water vapour is relatively low. This corresponds to an enhancement of the greenhouse effect of such clouds by 10%. The near‐global impact of scattering on OLR is estimated to be −3.0 W m−2, with low clouds contributing −0.9 W m−2, mid‐level cloud −0.7 W m−2 and high clouds −1.4 W m−2. Although this effect appears small compared to the global mean OLR of 240 W m−2, it indicates that neglect of scattering will lead to an error in cloud long‐wave forcing of about 10% and an error in net cloud forcing of about 20%. Copyright © 2006 Royal Meteorological Society.