气候变化领域集成服务门户(CCPortal): High-Resolution Observations of Turbulence Distributions Across Tropopause Folds

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DOI	10.1029/2020JD033857
	High-Resolution Observations of Turbulence Distributions Across Tropopause Folds
	Söder J.; Zülicke C.; Gerding M.; Lübken F.-J.
发表日期	2021
ISSN	2169897X
卷号	126 期号:6
英文摘要	In this study, we interpret two vertical turbulence measurements. We acquired these uninterrupted high-resolution dissipation rate profiles with the balloon-borne instrument LITOS (Leibniz Institute Turbulence Observations in the Stratosphere) from velocity measurements using a spectral technique. The meteorological situation is characterized using ECMWF’s integrated forecast system (IFS) as breaking Rossby waves showing significant tropospheric jets and a developed tropopause fold. In both cases, dissipation rates in the shear zone above the upper-tropospheric jet are three orders of magnitude larger than below, reaching severe turbulence strengths (1,000 mW kg−1) in a deep tropopause fold and moderate turbulence strengths in a medium tropopause fold (10 mW kg−1). These turbulent spots are shown to create a tripole shaped pattern of PV modification across the tropopause. Furthermore, tracer-tracer correlations exhibit mixing of tropospheric and stratospheric air masses in the medium-fold case. While the strength of turbulence corresponds to the depth of the tropopause fold, its asymmetric vertical distribution is possibly related to the tropopause fold life cycle. The observed asymmetry in the vertical turbulence distribution is consistent across both tropopause folds and in overall agreement with measured Richardson numbers. In the medium-fold case however, it is neither expected from conceptual models nor from Richardson numbers in the IFS. This calls for further field campaigns to investigate the role of turbulence and its implications for the meteorological understanding as well as for aviation safety. © 2021. The Authors.
英文关键词	balloon observations; mixing; potential vorticity; tropopause fold; turbulence; upper-level jet-front systems
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/185446
作者单位	Optics Department, Leibniz Institute of Atmospheric Physics at the University of Rostock, Kühlungsborn, Germany; Theory Department, Leibniz Institute of Atmospheric Physics at the University of Rostock, Kühlungsborn, Germany
推荐引用方式 GB/T 7714	Söder J.,Zülicke C.,Gerding M.,et al. High-Resolution Observations of Turbulence Distributions Across Tropopause Folds[J],2021,126(6).
APA	Söder J.,Zülicke C.,Gerding M.,&Lübken F.-J..(2021).High-Resolution Observations of Turbulence Distributions Across Tropopause Folds.Journal of Geophysical Research: Atmospheres,126(6).
MLA	Söder J.,et al."High-Resolution Observations of Turbulence Distributions Across Tropopause Folds".Journal of Geophysical Research: Atmospheres 126.6(2021).