气候变化领域集成服务门户(CCPortal): Oblique Gravity Wave Propagation During Sudden Stratospheric Warmings

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DOI	10.1029/2019JD031528
	Oblique Gravity Wave Propagation During Sudden Stratospheric Warmings
	Stephan C.C.; Schmidt H.; Zülicke C.; Matthias V.
发表日期	2020
ISSN	2169897X
卷号	125 期号:1
英文摘要	Gravity waves (GWs) are important for coupling the mesosphere to the lower atmosphere during sudden stratospheric warmings (SSWs). Here, a minor SSW is internally generated in a simulation with the upper-atmosphere configuration of the ICOsahedral Nonhydrostatic model. At a horizontal resolution of 20 km the simulation uses no GW drag parameterizations but resolves large fractions of the GW spectrum explicitly, including orographic and nonorographic sources. Consistent with previous studies, the simulated zonal-mean stratospheric warming is accompanied by zonal-mean mesospheric cooling. During the course of the SSW the mesospheric GW momentum flux (GWMF) turns from mainly westward to mainly eastward. Waves of large phase speed (40–80 m s -1) dominate the eastward GWMF during the peak phase of the warming. The GWMF is strongest along the polar night jet axis. Parameterizations of GWs usually assume straight upward propagation, but this assumption is often not satisfied. In the case studied here, a substantial amount of the GWMF is significantly displaced horizontally between the source region and the dissipation region, implying that the local impact of GWs on the mesosphere does not need to be above their local transmission through the stratosphere. The simulation produces significant vertically misaligned anomalies between the stratosphere and mesosphere. Observations by the Microwave Limb Sounder confirm the poleward tilt with height of the polar night jet and horizontal displacements between mesospheric cooling and stratospheric warming patterns. Thus, lateral GW propagation may be required to explain the middle-atmosphere temperature evolution in SSW events with significant zonally asymmetric anomalies. ©2019. The Authors.
英文关键词	Gravity wave propagation; High-resolution climate model; Microwave Limb Sounder; Sudden Stratospheric Warming; Tilt of polar night jet; Zonal asymmetries
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186243
作者单位	Max Planck Institute for Meteorology, Hamburg, Germany; Leibniz Institute of Atmospheric Physics, Kühlungsborn, Germany; Potsdam Institute for Climate Impact Research, Potsdam, Germany
推荐引用方式 GB/T 7714	Stephan C.C.,Schmidt H.,Zülicke C.,et al. Oblique Gravity Wave Propagation During Sudden Stratospheric Warmings[J],2020,125(1).
APA	Stephan C.C.,Schmidt H.,Zülicke C.,&Matthias V..(2020).Oblique Gravity Wave Propagation During Sudden Stratospheric Warmings.Journal of Geophysical Research: Atmospheres,125(1).
MLA	Stephan C.C.,et al."Oblique Gravity Wave Propagation During Sudden Stratospheric Warmings".Journal of Geophysical Research: Atmospheres 125.1(2020).