Mechanisms of Future Predicted Changes in the Zonal Mean Mid-Latitude Circulation
Mechanisms of Future Predicted Changes in the Zonal Mean Mid-Latitude Circulation
复制标题
未来预测纬向平均中纬度环流变化的机制
DOI:
10.1007/s40641-019-00145-8
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发表时间:
2019
影响因子:
9.5
通讯作者:
Shaw, Tiffany A.
中科院分区:
文献类型:
--
作者:
Shaw, Tiffany A.
State-of-the-art climate models predict the zonal mean mid-latitude circulation will undergo a poleward shift and seasonally and hemispherically dependent intensity changes in the future. Here I review the mechanisms put forward to explain the zonal mean mid-latitude circulation response to increased carbon dioxide (CO2) concentration. The mechanisms are grouped according to their thermodynamic starting point, which are thought to arise from processes independent of the zonal mean mid-latitude circulation response. There are 24 mechanisms and 8 thermodynamic starting points: (i) increased latent heat release aloft in the tropics, (ii) increased dry static stability and tropopause height outside the tropics, (iii) radiative cooling of the stratosphere, (iv) Hadley cell expansion, (v) increased specific humidity following the Clausius-Clapeyron relation, (vi) cloud radiative effect changes, (vii) turbulent surface heat flux changes, and (viii) decreased surface meridional temperature gradient. I argue progress can be made by testing the thermodynamic starting points. I review recent tests of the increased latent heat release aloft in the tropics starting point, i.e., prescribing diabatic perturbations, quantifying the transient response to an abrupt CO2increase and imposing latitudinally dependent CO2concentration. Finally, I provide a future outlook for improving our understanding of predicted changes in the zonal mean mid-latitude circulation.
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