Is the Net Cloud Radiative Effect Constrained to be Uniform Over the Tropical Warm Pools?
Is the Net Cloud Radiative Effect Constrained to be Uniform Over the Tropical Warm Pools?
复制标题
热带暖池上的净云辐射效应是否受限于均匀？
DOI：
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发表时间：
2019
影响因子：
5.2
通讯作者：
J. Norris
中科院分区：
文献类型：
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作者：
C. Wall;D. Hartmann;J. Norris
利用全球辐射-对流平衡模拟研究了热带暖池上空对流区和非对流区云的净辐射效应（CRE）与云辐射、海表温度梯度和大气环流之间的相互作用的关系。我们进行了一个实验，对流云自然地与海洋和大气相互作用，形成在最温暖的水和阴影，并在实验中，这种相互作用是通过随机化云阴影的海洋。去除云遮蔽相互作用增强了海表面温度梯度、横向大气热传输和大尺度对流聚集，并产生了具有更负净CRE的对流云。这些研究结果支持的假设，海表温度和对流之间的反馈是至关重要的，以获得类似的净CRE在热带暖池对流和非对流区域。
Global radiative‐convective equilibrium simulations are used to investigate the hypothesis that mutual interactions among cloud albedo, sea surface temperature gradients, and atmospheric circulation constrain the net cloud radiative effect (CRE) to be similar in convective and nonconvective regions over the tropical warm pools. We perform an experiment in which convective clouds interact naturally with the ocean and atmosphere by forming over the warmest water and shading it and an experiment in which this interaction is removed by randomizing cloud shading of the ocean. Removing the cloud shading interaction enhances sea surface temperature gradients, lateral atmospheric heat transport, and large‐scale convective aggregation and produces convective clouds with much more negative net CRE. These findings support the hypothesis that feedbacks between sea surface temperature and convection are critical to obtaining similar net CRE in convective and nonconvective regions over the tropical warm pools.