Eastward-Propagating Planetary Waves Prior to the January 2009 Sudden Stratospheric Warming

被引：15

作者：

Rhodes, Christian T. ^{[1
]}

Limpasuvan, Varavut ^{[1
]}

Orsolini, Yvan J. ^{[2
,3
]}

机构：

[1] Coastal Carolina Univ, Sch Coastal Environm, Conway, SC 29528 USA

[2] Norwegian Inst Air Res NILU, Kjeller, Norway

[3] Norwegian Univ Sci & Technol, Dept Phys, Trondheim, Norway

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES | 2021年 / 126卷 / 11期

基金：

美国国家科学基金会;

关键词：

GRAVITY-WAVES; SHEAR-FLOW; INSTABILITY; OVERREFLECTION; THERMOSPHERE; VARIABILITY; MESOSPHERE; NORTHERN; EVENT;

D O I：

10.1029/2020JD033696

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Eastward-propagating planetary waves (EPWs) were investigated prior to the boreal January 2009 major sudden stratospheric warming (SSW) event simulated by the National Center for Atmospheric Research's Whole Atmosphere Community Climate Model with specified dynamics. About 22 days before SSW onset, a background flow with jet maxima around the upper polar stratosphere and subtropical mesosphere developed due to the net forcing by gravity and planetary waves. The mesospheric wind structure was largely unstable and supported a wave geometry conducive to overreflection. With a zonal phase speed of similar to 10 m s(-1), EPWs appeared near their turning and critical layers as wavenumber-2 perturbations in the stratosphere and mesosphere. Accompanied by upward EPW activity from the lower stratosphere, EPW growth exhibited characteristics of wave instability and overreflection.

引用

页数：19

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