Enhanced Tropospheric Wave Forcing of Two Anticyclones in the Prephase of the January 2009 Major Stratospheric Sudden Warming Event
Enhanced Tropospheric Wave Forcing of Two Anticyclones in the Prephase of the January 2009 Major Stratospheric Sudden Warming Event
复制标题
2009 年 1 月主要平流层突然变暖事件前期两个反气旋的增强对流层波强迫
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
O. Martius
中科院分区：
文献类型：
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作者：
A. Schneidereit;D. Peters;C. Grams;J. Quinting;J. Keller;G. Wolf;F. Teubler;M. Riemer;O. Martius
摘要：在 2009 年 1 月主要平流层突然变暖事件（MSSW 2009）的前期研究了行星波数 2 的对流层强迫。由于主要由波数 2 引起的埃利亚森-帕尔姆通量大幅增加，东风角动量被输送到北极平流层并沉积，然后使极地夜间急流减速。与早期研究一致，结果表明，与波数 2 相关的最强涡流热通量出现在 ERA-Interim 的 MSSW 2009 前期的 100 hPa 处。此外，ENSO（拉尼娜）冷相的温和条件也导致了涡流热通量异常。结果表明，阿拉斯加和斯堪的纳维亚半岛上空对流层波强迫的增强是由热带过程以两种方式引起的。首先，从气候学意义上来说，拉尼娜现象有助于增强这两个地区的反气旋流。其次，马登-朱利安振荡（MJO）通过增强整个时期的涡流活动，对阿拉斯加海脊产生间接影响。
AbstractTropospheric forcing of planetary wavenumber 2 is examined in the prephase of the major stratospheric sudden warming event in January 2009 (MSSW 2009). Because of a huge increase in Eliassen–Palm fluxes induced mainly by wavenumber 2, easterly angular momentum is transported into the Arctic stratosphere, deposited, and then decelerates the polar night jet. In agreement with earlier studies, the results reveal that the strongest eddy heat fluxes, associated with wavenumber 2, occur at 100 hPa during the prephase of MSSW 2009 in ERA-Interim. In addition, moderate conditions of the cold phase of ENSO (La Nina) contribute to the eddy heat flux anomaly. It is shown that enhanced tropospheric wave forcing over Alaska and Scandinavia is caused by tropical processes in two ways. First, in a climatological sense, La Nina contributes to an enhanced anticyclonic flow over both regions. Second, the Madden–Julian oscillation (MJO) has an indirect influence on the Alaskan ridge by enhancing eddy activity over t...
影响因子：
8.9
作者：
C. Grams;H. Wernli;M. Böttcher;J. Čampa;U. Corsmeier;S. Jones;J. Keller;C. Lenz;L. Wiegand-
通讯作者：
C. Grams;H. Wernli;M. Böttcher;J. Čampa;U. Corsmeier;S. Jones;J. Keller;C. Lenz;L. Wiegand-