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首页> 外文期刊>Journal of Climate >Initial transient response of the winter polar stratospheric vortex to idealized equatorial Pacific sea surface temperature anomalies in the NCAR WACCM.
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Initial transient response of the winter polar stratospheric vortex to idealized equatorial Pacific sea surface temperature anomalies in the NCAR WACCM.

机译：NCAR WACCM中冬季极地平流层涡旋对理想赤道太平洋海表温度异常的初始瞬态响应。

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Perpetual winter simulations using the NCAR Whole Atmosphere Community Climate Model (WACCM) are conducted to document the differences of the initial transient response of the boreal winter Northern Hemisphere stratospheric polar vortex to central (CPW) and eastern Pacific warming (EPW) events. Idealized patches of positive sea surface temperature (SST) anomalies are superimposed onto a climatological SST field to mimic canonical CPW and EPW forcings. A 20-member ensemble was created by varying initial atmospheric conditions for both CPW and EPW cases. In the ensemble average, the vortex weakens under both CPW and EPW forcing, indicated by a negative zonal mean zonal wind tendency. This tendency is mainly tied to changes in the eddy-driven mean meridional circulation (MMC). A negative anomaly in the eddy momentum flux convergence also plays a secondary role in the weakening. The vortex response, however, differs dramatically among individual ensemble members. A few ensemble members exhibit initial vortex strengthening although weaker in magnitude and shorter in duration than the initial weakening in the ensemble average. The initial state and the subsequent internal variation of the extratropical atmosphere is at least as important as the type of SST forcing in determining the transient response of the stratospheric polar vortex. Interactions between the internal variability of the vortex and SST-driven wave anomalies ultimately determine the nature of the initial transient response of the vortex to EPW and CPW forcing. This sensitivity to the initial atmospheric state has implications for understanding medium-range forecasts of the extratropical atmospheric response to emerging tropical SST anomalies, particularly over high-latitude regions.
机译：进行了使用NCAR整个大气社区气候模型（WACCM）进行的永久冬季模拟，以记录北半球冬季平流层极地涡对中央（CPW）和东太平洋变暖（EPW）事件的初始瞬态响应的差异。将理想的正海面温度（SST）异常斑块叠加到气候SST场上，以模拟规范的CPW和EPW强迫。通过改变CPW和EPW案例的初始大气条件，创建了一个由20名成员组成的合奏。在总体平均水平上，在CPW和EPW强迫作用下，涡旋减弱，由负平均纬向风向表示。这种趋势主要与涡流驱动的平均子午循环（MMC）的变化有关。涡动量通量收敛中的负异常在减弱中也起着次要作用。但是，各个合奏成员之间的涡旋响应差异很大。一些合奏成员表现出初始涡旋增强，尽管其强度比合奏平均函数中的初始减弱弱，并且持续时间短。在确定平流层极涡旋的瞬态响应时，温带大气的初始状态和随后的内部变化至少与SST强迫的类型一样重要。旋涡的内部变异性与SST驱动的波异常之间的相互作用最终决定了旋涡对EPW和CPW强迫的初始瞬态响应的性质。这种对初始大气状态的敏感性对于理解对新出现的热带海表温度异常（特别是在高纬度地区）的温带大气响应的中期预测具有影响。

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