The radiative impact of clouds on the shift of the Intertropical Convergence Zone
The radiative impact of clouds on the shift of the Intertropical Convergence Zone
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DOI：
10.1002/2014gl060354
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发表时间：
2014-06
影响因子：
5.2
通讯作者：
A. Voigt;S. Bony;J. Dufresne;B. Stevens
中科院分区：
文献类型：
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作者：
A. Voigt;S. Bony;J. Dufresne;B. Stevens
虽然云对地球表面温度的变化很重要，但它们对大尺度大气环流变化的影响却不太清楚。在这里，我们研究了云的辐射影响的热带辐合带（ITCZ）的移动，半球表面强迫的响应。这个问题是接近使用aquaplanet模拟与四个全面的大气模型。云对ITCZ位移的辐射影响在不同模型中的符号和幅度不同，并且负责ITCZ位移中模型传播的一半。模式传播主要是热带云，其辐射影响与其云辐射特性对环流的依赖性有关。模拟不仅证明了云对环流变化的重要性，而且提出了一种减少ITCZ变化的模式不确定性的方法。
Whereas it is well established that clouds are important to changes in Earth's surface temperature, their impact on changes of the large‐scale atmospheric circulation is less well understood. Here we study the radiative impact of clouds on the shift of the Intertropical Convergence Zone (ITCZ) in response to hemispheric surface albedo forcings. The problem is approached using aquaplanet simulations with four comprehensive atmosphere models. The radiative impact of clouds on the ITCZ shift differs in sign and magnitude across models and is responsible for half of the model spread in the ITCZ shift. The model spread is dominated by tropical clouds whose radiative impact is linked to the dependence of their cloud radiative properties on the circulation. The simulations not only demonstrate the importance of clouds for circulation changes but also propose a way to reduce the model uncertainty in ITCZ shifts.