Clouds and the Atmospheric Circulation Response to Warming
Clouds and the Atmospheric Circulation Response to Warming
复制标题
DOI：
10.1175/jcli-d-15-0394.1
复制
发表时间：
2016-01
影响因子：
4.9
通讯作者：
P. Ceppi;D. Hartmann
中科院分区：
文献类型：
--
作者：
P. Ceppi;D. Hartmann
摘要在一个海洋下界为平板的水行星模式中，研究了云对大气环流对二氧化碳增加四倍的响应的影响。在短波(SW)或长波(LW)辐射方案中，通过将云锁定到控制或4xCO2状态来隔离云效应。在该模型中，云辐射变化解释了在二氧化碳翻两番的情况下，哈德利环流、中纬度急流和风暴路径向极地扩展的一半以上，尽管它们只造成了全球平均地表变暖总量的四分之一。云对环流的影响主要是由于西南云的辐射变化，使对流层各层赤道到极地的温度梯度强烈增强，有利于中纬度涡旋的增强和极移。相比之下，在保持云层不变的情况下，二氧化碳增加四倍会导致较强的极地放大和较低水平的中纬度斜压性减弱，导致环流仅向极地小幅扩张。那个.。
AbstractThe authors study the effect of clouds on the atmospheric circulation response to CO2 quadrupling in an aquaplanet model with a slab ocean lower boundary. The cloud effect is isolated by locking the clouds to either the control or 4xCO2 state in the shortwave (SW) or longwave (LW) radiation schemes. In the model, cloud radiative changes explain more than half of the total poleward expansion of the Hadley cells, midlatitude jets, and storm tracks under CO2 quadrupling, even though they cause only one-fourth of the total global-mean surface warming. The effect of clouds on circulation results mainly from the SW cloud radiative changes, which strongly enhance the equator-to-pole temperature gradient at all levels in the troposphere, favoring stronger and poleward-shifted midlatitude eddies. By contrast, quadrupling CO2 while holding the clouds fixed causes strong polar amplification and weakened midlatitude baroclinicity at lower levels, yielding only a small poleward expansion of the circulation. Th...