The Influence of Atmospheric Cloud Radiative Effects on the Large-Scale Stratospheric Circulation
The Influence of Atmospheric Cloud Radiative Effects on the Large-Scale Stratospheric Circulation
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DOI：
10.1175/jcli-d-16-0643.1
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
LI Ying;David;J. W.;Thompson
中科院分区：
文献类型：
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作者：
LI Ying;David;J. W.;Thompson
以往的研究已经探索了大气云辐射效应(ARE)对对流层环流的影响。本文探讨了ALARE对平流层环流的fl影响。平流层环流对ARE的响应是通过比较使用和不使用ARE的模拟来评估的。平流层环流对AARE的响应在一系列不同的GCM中是可重现的，并且可以在动态驱动和辐射驱动的背景下解释。动态分量与ALAR引起的波活动的垂直和经向flux的变化有关。AARE引起的进入平流层的波活动的垂直flUX的变化与AARE引起的对流层斜压性的变化以及中纬度斜压涡的幅度是一致的。其原因是：布鲁尔-多布森环流加强，热带低平流层冷却，极涡减弱和变暖，热带对流层顶过渡层附近的静力稳定性降低，以及热带外平流层变率的时间尺度缩短。低纬度平流层波动活动的赤道向flUX的变化是副热带低至中层平流层纬向风增强的原因，辐射成分与AARE引起的进入低平流层的长波辐射flUX的变化有关。辐射fl的变化导致温带下部平流层冷却，温带对流层顶附近的静力稳定性和云量发生变化，温带外平流层变率的时间尺度缩短。这些结果突出了以前被忽视的一条途径，fl的对流层气候通过这条途径影响平流层。纬向平均纬向异常55.8758N回归JFM纬向平均气压水平和滞后标准化纬向异常。以JFM季节为中心的滞后回归日异常数据。0d，10hPa纬向平均纬向风出现正异常，0d后开始减弱。
Previous studies have explored the influence of atmospheric cloud radiative effects (ACRE) on the tropospheric circulation. Here the authors explore the influence of ACRE on the stratospheric circulation. The response of the stratospheric circulation to ACRE is assessed by comparing simulations run with and without ACRE. The stratospheric circulation response to ACRE is reproducible in a range of different GCMs and can be interpreted in the context of both a dynamically driven and a radiatively driven component. The dynamic component is linked to ACRE-induced changes in the vertical and meridional fluxes of wave activity. The ACRE-induced changes in the vertical flux of wave activity into the stratosphere are consistent with the ACRE-induced changes in tropospheric baroclinicity and thus the amplitude of midlatitude baroclinic eddies. They account for a strengthening of the Brewer–Dobson circulation, a cooling of the tropical lower stratosphere, a weakening and warming of the polar vortex, a reduction of static stability near the tropical tropopause transition layer, and a shortening of the time scale of extratropical stratospheric variability. The ACRE-induced changes in the equatorward flux of wave activity in the low-latitude stratosphere account for a strengthening of the zonal wind in the subtropical lower to midstratosphere.Theradiativecomponent is linked to ACRE-induced changes in the flux of longwave radiation into the lower stratosphere. The changes in radiative fluxes lead to a cooling of the extratropical lower stratosphere, changes in the static stability and cloud fraction near the extratropical tropopause, and a shortening of the time scales of extratropical stratospheric variability. The results highlight a previously overlooked pathway through which tropospheric climate influences the stratosphere. zonal-mean zonal anomalies 55 8 75 8 N regressed standardized JFM zonal-mean zonal anomalies of pressure level and lag. lag regressions daily anomaly data centered about the JFM season. construction, positive anomalies in the zonal-mean zonal wind at 10hPa, day 0, and start decaying after day 0.