Poleward Stationary Eddy Heat Transport by the Tibetan Plateau and Equatorward Shift of Westerlies during Northern Winter
Poleward Stationary Eddy Heat Transport by the Tibetan Plateau and Equatorward Shift of Westerlies during Northern Winter
复制标题
北方冬季青藏高原极地固定涡热输送与西风带赤道移动
DOI：
10.1175/jas-d-13-039.1
复制
发表时间：
2013
影响因子：
3.1
通讯作者：
S. Son
中科院分区：
文献类型：
--
作者：
Hyo‐Seok Park;S. Xie;S. Son
在观测到的年际变率中可以看到静止和瞬态涡旋热输运之间的这种补偿。模式和观测结果都表明，经向温度梯度和与之相关的西线中纬度减弱了经向热输运，从而减弱了瞬态死亡。
The orographic effect of the Tibetan Plateau on atmospheric poleward heat transport is investigated using an atmospheric general circulation model. The linear interference between the Tibetan Plateau‐induced winds and the eddy temperature field associated with the land‐sea thermal contrast is a key factor for enhancing the poleward stationary eddy heat transport. Specifically, Tibetan Plateau‐induced stationary waves producenortherliesoverthecoldeasternEurasiancontinent,leadingtoapolewardheattransport.Inanother hot spot of stationary eddy heat transport over the eastern North Pacific, Tibetan Plateau‐induced stationary waves transport relatively warm marine air northward. In an experiment where the Tibetan Plateau is removed, the poleward heat transport is mostly accomplished by transient eddies, similar to the Southern Hemisphere. In the presence of the Tibetan Plateau, the enhanced stationary eddy heat transport is offset by a comparable reduction in transient eddy heat transport. This compensation between stationary and transient eddy heat transport is seen in observed interannual variability. Both the model and observations indicate that an enhanced poleward heat transport by stationary waves weakens transienteddiesbydecreasingthemeridionaltemperaturegradientandtheassociatedwesterliesinmidlatitudes.