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DOI	10.5194/acp-19-6621-2019
	Composite analysis of the tropopause inversion layer in extratropical baroclinic waves
	Kaluza T.; Kunkel D.; Hoor P.
发表日期	2019
ISSN	16807316
起始页码	6621
结束页码	6636
卷号	19 期号:10
英文摘要	The evolution of the tropopause inversion layer (TIL) during cyclogenesis in the North Atlantic storm track is investigated using operational meteorological analysis data (Integrated Forecast System from the European Centre for Medium-Range Weather Forecasts). For this a total of 130 cyclones have been analysed during the months August through October between 2010 and 2014 over the North Atlantic. Their paths of migration along with associated flow features in the upper troposphere and lower stratosphere (UTLS) have been tracked based on the mean sea level pressure field. Subsets of the 130 cyclones have been used for composite analysis using minimum sea level pressure to filter the cyclones based on their strength. The composite structure of the TIL strength distribution in connection with the overall UTLS flow strongly resembles the structure of the individual cyclones. Key results are that a strong dipole in TIL strength forms in regions of cyclonic wrap-up of UTLS air masses of different origin and isentropic potential vorticity. These air masses are associated with the cyclonic rotation of the underlying cyclones. The maximum values of enhanced static stability above the tropopause occur north and northeast of the cyclone centre, vertically aligned with outflow regions of strong updraft and cloud formation up to the tropopause, which are situated in anticyclonic flow patterns in the upper troposphere. These regions are co-located with a maximum of vertical shear of the horizontal wind. The strong wind shear within the TIL results in a local minimum of Richardson numbers, representing the possibility for turbulent instability and potential mixing (or air mass exchange) within regions of enhanced static stability in the lowermost stratosphere. © Author(s) 2019.
语种	英语
scopus关键词	baroclinic wave; cyclogenesis; cyclone; extratropical environment; storm track; stratosphere-troposphere interaction; tropopause; Atlantic Ocean; Atlantic Ocean (North)
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144399
作者单位	Institute for Atmospheric Physics, Johannes-Gutenberg University Mainz, Mainz, Germany
推荐引用方式 GB/T 7714	Kaluza T.,Kunkel D.,Hoor P.. Composite analysis of the tropopause inversion layer in extratropical baroclinic waves[J],2019,19(10).
APA	Kaluza T.,Kunkel D.,&Hoor P..(2019).Composite analysis of the tropopause inversion layer in extratropical baroclinic waves.Atmospheric Chemistry and Physics,19(10).
MLA	Kaluza T.,et al."Composite analysis of the tropopause inversion layer in extratropical baroclinic waves".Atmospheric Chemistry and Physics 19.10(2019).