Cloud‐Radiative Impact on the Regional Responses of the Midlatitude Jet Streams and Storm Tracks to Global Warming
Cloud‐Radiative Impact on the Regional Responses of the Midlatitude Jet Streams and Storm Tracks to Global Warming
复制标题
云辐射对中纬度急流和风暴路径对全球变暖的区域响应的影响
DOI：
10.1029/2018ms001592
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发表时间：
2019
影响因子：
6.8
通讯作者：
J. Pinto
中科院分区：
文献类型：
--
作者：
Nicole Albern;A. Voigt;J. Pinto
以前的工作证明了云和中纬度环流之间的强辐射耦合。在这里，我们调查云辐射变化对北大西洋，北太平洋和南半球中纬度急流和风暴路径的全球变暖响应的影响。为此，我们使用二十面体非静力全球大气模式在目前的设置和云锁定方法。海洋表面温度被规定为隔离大气云辐射加热的环流响应。在年平均中，云辐射变化对所有三个海洋盆地的极向急流转移贡献了三分之一到三分之二，并支持北大西洋和南半球的急流加强。云辐射变化也会影响风暴路径，但在三个海洋盆地中的影响更为多样。云辐射对北大西洋和北太平洋急流的影响在绝对值上从季节到季节变化不大，而其相对重要性在一年中变化。在南半球，云辐射变化在所有季节都加强了急流，而它们对急流转变的影响仅限于南半球的夏季和秋季。云辐射的影响在很大程度上是纬向对称的，并且与全球变暖是否由均匀的4 K或空间变化的海面温度增加来模拟无关。我们的研究结果强调了云辐射变化对中纬度环流对全球变暖的响应的重要性，表明云可以导致未来环流模型预测的不确定性。
Previous work demonstrated the strong radiative coupling between clouds and the midlatitude circulation. Here we investigate the impact of cloud‐radiative changes on the global warming response of the midlatitude jet streams and storm tracks in the North Atlantic, North Pacific, and Southern Hemisphere. To this end, we use the ICOsahedral Nonhydrostatic global atmosphere model in present‐day setup and with the cloud‐locking method. Sea surface temperatures are prescribed to isolate the circulation response to atmospheric cloud‐radiative heating. In the annual mean, cloud‐radiative changes contribute one to two thirds to the poleward jet shift in all three ocean basins and support the jet strengthening in the North Atlantic and Southern Hemisphere. Cloud‐radiative changes also impact the storm track, but the impact is more diverse across the three ocean basins. The cloud‐radiative impact on the North Atlantic and North Pacific jets varies little from season to season in absolute terms, whereas its relative importance changes over the course of the year. In the Southern Hemisphere, cloud‐radiative changes strengthen the jet in all seasons, whereas their impact on the jet shift is limited to austral summer and fall. The cloud‐radiative impact is largely zonally symmetric and independent of whether global warming is mimicked by a uniform 4 K or spatially varying sea surface temperatures increase. Our results emphasize the importance of cloud‐radiative changes for the response of the midlatitude circulation to global warming, indicating that clouds can contribute to uncertainty in model projections of future circulations.
影响因子：
4.6
作者：
B. Harvey;L. Shaffrey;T. Woollings
通讯作者：
B. Harvey;L. Shaffrey;T. Woollings
影响因子：
4.6
作者：
Harvey, B. J.;Shaffrey, L. C.;Woollings, T. J.
通讯作者：
Woollings, T. J.