Evidence of Strong Contributions From Mixed‐Phase Clouds to Arctic Climate Change
Evidence of Strong Contributions From Mixed‐Phase Clouds to Arctic Climate Change
复制标题
混合相云对北极气候变化有重大贡献的证据
DOI：
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复制
发表时间：
2019
影响因子：
5.2
通讯作者：
T. Storelvmo
中科院分区：
文献类型：
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作者：
I. Tan;T. Storelvmo
气候模型中混合相云中过冷液体比例的低估引发了对其对北极气候变化影响的质疑。我们证明，纠正 CESM 模型中的这种偏差可以增强或减少北极放大，具体取决于云的微物理特征，作为云相位反馈的必然结果。在云相反馈中用液体代替冰会导致更多向下的长波辐射，由于其独特的稳定层结条件，这些辐射被有效地捕获在北极表面，这最终导致更积极的递减率反馈。冰颗粒越大，北极放大作用就越强，因为与冰晶相比，液滴的降水效率较低。我们的结果强调了混合相云中微物理过程的真实再现的重要性，特别是在北极。
Underestimation of the proportion of supercooled liquid in mixed‐phase clouds in climate models has called into question its impact on Arctic climate change. We show that correcting for this bias in the CESM model can either enhance or reduce Arctic amplification depending on the microphysical characteristics of the clouds as a corollary to the cloud phase feedback. Replacement of ice with liquid in the cloud phase feedback results in more downward longwave radiation, which is effectively trapped as heat at the surface in the Arctic due to its unique stable stratification conditions, and this ultimately leads to a more positive lapse rate feedback. The larger the ice particles are to begin with, the stronger Arctic amplification becomes due to the lower precipitation efficiency of liquid droplets compared to ice crystals. Our results emphasize the importance of realistic representations of microphysical processes in mixed‐phase clouds, particularly in the Arctic.
影响因子：
6.3
作者：
DeMott, P. J.;Prenni, A. J.;Kreidenweis, S. M.
通讯作者：
Kreidenweis, S. M.