Radiative feedbacks are known to strongly modify horizontal shifts of the intertropical convergence zone (ITCZ) produced by remote atmospheric energy sources. This study uses a one-dimensional moist energy balance model to understand how radiative feedbacks and the structure of an imposed eddy diffusivity can influence such ITCZ shifts. The Planck feedback is shown to damp ITCZ shifts more strongly for extratropical forcings than for tropical ones, because lower moisture content in cold regions makes the temperature response larger there. The water vapor feedback on ITCZ shifts is shown to be dominated by changes in the cross-equatorial asymmetry of the relative humidity of subtropical dry zones, with additional contributions by the changes in mixing ratio that occur at fixed relative humidity and by the meridional shift of the humid ITCZ. Finally, the ITCZ response is found to be highly sensitive to the meridional structure of the diffusivity; the ITCZ shift increases with the tropical diffusivity, even when the global mean diffusivity is fixed.

已知辐射反馈会强烈改变由遥远的大气能源产生的热带辐合带（ITCZ）的水平位移。这项研究使用一维湿能平衡模型来了解辐射反馈和强加的涡流扩散率的结构如何影响这种ITCZ位移。结果表明，相比热带地区，普朗克反馈对热带外强迫的抑制作用更强，因为寒冷地区较低的水分含量使热带地区的温度响应更大。研究表明，ITCZ位移上的水蒸气反馈主要由亚热带干燥区相对湿度的跨赤道不对称性变化所决定，另外，由固定相对湿度下混合比的变化以及由子午线经向位移引起的其他贡献也是如此。潮湿的ITCZ。最后，发现ITCZ响应对扩散的子午线结构高度敏感；即使全球平均扩散率是固定的，ITCZ偏移也会随着热带扩散率而增加。