Impact of cloud radiative heating on East Asian summer monsoon circulation
Impact of cloud radiative heating on East Asian summer monsoon circulation
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DOI：
10.1088/1748-9326/10/7/074014
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发表时间：
2015-07
影响因子：
6.7
通讯作者：
Zhun Guo;Tianjun Zhou;Minghuai Wang;Y. Qian
中科院分区：
文献类型：
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作者：
Zhun Guo;Tianjun Zhou;Minghuai Wang;Y. Qian
利用社区大气模式第5版（CAM 5）研究了云辐射加热对中国东南部（105°-125 ° E，20°-35 ° N）东亚夏季风（EASM）的影响。敏感性试验表明，云的辐射加热对中国东南部东亚夏季风局地环流有积极的影响。如果没有云的辐射加热，东亚夏季风的环流和降水将比正常情况下弱得多。云的长波加热控制了东亚夏季风环流的变化。用热力学能量方程解释了云对东亚夏季风环流的积极作用，即云底云顶加热率的差异增强了中国东南部地区的对流不稳定，从而增强了上升气流。强烈的上升气流通过Sverdrup涡度平衡将进一步导致上升气流中心上方出现一股向南的纬向风。
The impacts of cloud radiative heating on the East Asian Summer Monsoon (EASM) over southeastern China (105°–125°E, 20°–35°N) are addressed by using the Community Atmosphere Model version 5 (CAM5). Sensitivity experiments demonstrate that the radiative heating of clouds leads to a positive effect on the local EASM circulation over southeastern China. Without the radiative heating of clouds, the EASM circulation and precipitation would be much weaker than that in normal conditions. The longwave heating of clouds dominates the changes of EASM circulation. The positive effect of clouds on EASM circulation is explained by the thermodynamic energy equation, i.e. the different heating rate between cloud base and cloud top enhances the convective instability over southeastern China, which consequently enhances updraft. The strong updraft would further result in a southward meridional wind above the center of the updraft through Sverdrup vorticity balance.