The role of stationary and transient planetary waves in the maintenance of stratospheric polar vortex regimes in Northern Hemisphere winter
The role of stationary and transient planetary waves in the maintenance of stratospheric polar vortex regimes in Northern Hemisphere winter
复制标题
静止和瞬态行星波在北半球冬季平流层极涡状态维持中的作用
DOI：
10.1007/s00376-010-9163-7
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
X. Cui
中科院分区：
文献类型：
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作者：
Qian Li;H. Graf;X. Cui
利用1958 - 2002年NCEP/NCAR再分析资料，研究了北方冬季平流层定常和瞬变行星波的传播及其在波-平均流相互作用中的作用，并讨论了其对平流层极涡状态的影响。这是通过分析Eliassen-Palm（E-P）通量及其散度来完成的。研究发现，在北半球冬季，定常波和瞬变波都是向上传播和向赤道方向传播的，其中定常波从对流层向平流层的向上传播较强，瞬变波从中纬度向对流层的副热带向赤道方向传播较强。定常波在弱极涡区（WVR）比在强极涡区（SVR）表现出更多的向上传播。另一方面，瞬态波有更多的向上传播在SVR比在WVR在副极地平流层，与低频波的域。随着向上传播的路径不同，驻波和瞬态波有助于维持观测到的平流层PV制度在北半球冬季。
Using 1958–2002 NCEP/NCAR reanalysis data, we investigate stationary and transient planetary wave propagation and its role in wave-mean flow interaction which influences the state of the polar vortex (PV) in the stratosphere in Northern Hemisphere (NH) winter. This is done by analyzing the Eliassen-Palm (E-P) flux and its divergence. We find that the stationary and transient waves propagate upward and equatorward in NH winter, with stronger upward propagation of stationary waves from the troposphere to the stratosphere, and stronger equatorward propagation of transient waves from mid-latitudes to the subtropics in the troposphere. Stationary waves exhibit more upward propagation in the polar stratosphere during the weak polar vortex regime (WVR) than during the strong polar vortex regime (SVR). On the other hand, transient waves have more upward propagation during SVR than during WVR in the subpolar stratosphere, with a domain of low frequency waves. With different paths of upward propagation, both stationary and transient waves contribute to the maintenance of the observed stratospheric PV regimes in NH winter.