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DOI	10.1007/s00382-020-05166-w
	Effects of missing gravity waves on stratospheric dynamics; part 1: climatology
	Eichinger R.; Garny H.; Šácha P.; Danker J.; Dietmüller S.; Oberländer-Hayn S.
发表日期	2020
ISSN	0930-7575
起始页码	3165
结束页码	3183
卷号	54
英文摘要	Energy and momentum deposition from planetary-scale Rossby waves as well as from small-scale gravity waves (GWs) largely control stratospheric dynamics. Interactions between these different wave types, however, complicate the quantification of their individual contribution to the overall dynamical state of the middle atmosphere. In state-of-the-art general circulation models (GCMs), the majority of the GW spectrum cannot be resolved and therefore has to be parameterised. This is commonly implemented in two discrete schemes, one for GWs that originate from flow over orographic obstacles and one for all other kinds of GWs (non-orographic GWs). In this study, we attempt to gain a deeper understanding of the interactions of resolved with parameterised wave driving and of their influence on the stratospheric zonal winds and on the Brewer–Dobson circulation (BDC). For this, we set up a GCM time slice experiment with two sensitivity simulations: one without orographic GWs and one without non-orographic GWs. Our findings include an acceleration of the polar vortices, which has historically been one of the main reasons for including explicit GW parameterisations in GCMs. Further, we find inter-hemispheric differences in BDC changes when omitting GWs that can be explained by wave compensation and amplification effects. These are partly evoked through local changes in the refractive properties of the atmosphere caused by the omitted GW drag and a thereby increased planetary wave propagation. However, non-local effects on the flow can act to suppress vertical wave fluxes into the stratosphere for a very strong polar vortex. Moreover, we study mean age of stratospheric air to investigate the impact of missing GWs on tracer transport. On the basis of this analysis, we suggest that the larger ratio of planetary waves to GWs leads to enhanced horizontal mixing, which can have a large impact on stratospheric tracer distributions. © 2020, The Author(s).
英文关键词	Age of air; Brewer–Dobson circulation; Climate modelling; Compensation; Dynamics; Gravity waves; Mixing; Polar vortex; Stratosphere; Transport
语种	英语
scopus关键词	atmospheric circulation; atmospheric general circulation model; atmospheric transport; climate modeling; climatology; gravity wave; mixing; polar vortex; stratosphere; zonal wind
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145542
作者单位	Meteorological Institute, Ludwig-Maximilians-University (LMU), Munich, Germany; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany; Institute of Meteorology and Climatology, University of Natural Resources and Life Sciences (BOKU), Vienna, Austria; Faculty of Mathematics and Physics, Department of Atmospheric Physics, Charles University Prague, Prague, Czech Republic; Institute of Meteorology, Freie Universität Berlin, Berlin, Germany; Institute for Atmospheric and Environmental Sciences, Goethe University, Frankfurt am Main, Germany
推荐引用方式 GB/T 7714	Eichinger R.,Garny H.,Šácha P.,et al. Effects of missing gravity waves on stratospheric dynamics; part 1: climatology[J],2020,54.
APA	Eichinger R.,Garny H.,Šácha P.,Danker J.,Dietmüller S.,&Oberländer-Hayn S..(2020).Effects of missing gravity waves on stratospheric dynamics; part 1: climatology.Climate Dynamics,54.
MLA	Eichinger R.,et al."Effects of missing gravity waves on stratospheric dynamics; part 1: climatology".Climate Dynamics 54(2020).