Two competing pathways of aerosol effects on cloud and precipitation formation
Two competing pathways of aerosol effects on cloud and precipitation formation
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DOI：
10.1029/2006gl028349
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发表时间：
2007-02
影响因子：
5.2
通讯作者：
T. Takemura;Y. Kaufman;L. Remer;T. Nakajima
中科院分区：
文献类型：
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作者：
T. Takemura;Y. Kaufman;L. Remer;T. Nakajima
气溶胶可能通过两种途径影响云的形成：一种是通过形成更小和更多的云滴来影响云的微物理，从而减少降水，从而延长云的寿命。第二种称为气溶胶动力-水文效应，气溶胶的直接、半直接和间接效应可以调制大气辐射，从而扰乱大气环流，导致云和降水的再分配。在这里，这项研究使用一个大气环流模式和一个气溶胶输送-辐射模式来研究气候敏感性。该模型首先在规定的气象条件下运行，以隔离云的微物理效应。它是在一项内部产生的气象学的单独实验中进行的，该实验包括气溶胶改变云层并与辐射相互作用时的动态水文效应。我们发现，在某些地区，在自由模型运行中的动态水文效应抵消了在规定运行中所看到的微物理效应。
Aerosols may influence cloud formation through two pathways: One is the effect on cloud microphysics by forming smaller and more numerous cloud droplets reducing precipitation and consequently enhancing cloud lifetime. The second is referred to as the aerosol dynamic‐hydrological effect in which the aerosol direct, semi‐direct, and indirect effects can modulate atmospheric radiation, which perturbs atmospheric circulation, leading to redistributions of clouds and precipitation. Here this study examines climate sensitivities using a general circulation model coupled with an aerosol transport‐radiation model. The model is run first with prescribed meteorology in order to isolate the cloud microphysical effect. It is run in a separate experiment with internally generated meteorology that includes dynamic‐hydrological effect as the aerosols modify clouds and interact with the radiation. We find in some regions that the dynamic‐hydrological effect in the free model runs counteracts the microphysical effects seen in the prescribed runs.