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  Instabilities of low-latitude easterly jets in the presence of moist convection and topography and related cyclogenesis, in a simple atmospheric model

Rostami, M., Zeitlin, V. (2022): Instabilities of low-latitude easterly jets in the presence of moist convection and topography and related cyclogenesis, in a simple atmospheric model. - Geophysical and Astrophysical Fluid Dynamics, 116, 1, 56-77.
https://doi.org/10.1080/03091929.2021.1959574

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 Creators:
Rostami, Masoud1, Author              
Zeitlin, Vladimir2, Author
Affiliations:
1Potsdam Institute for Climate Impact Research, ou_persistent13              
2External Organizations, ou_persistent22              

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 Abstract: A simple two-layer model, the moist-convective rotating shallow water, which allows for low-cost high-resolution numerical simulations of the dynamics of the moist atmosphere in the presence of topography, is used to identify and understand dynamical processes governing the evolution of easterly waves propagating on the background of a low-latitude easterly jet crossing a land-sea boundary, a setup crudely representing the African Easterly Jet over the West-African plateau and the Atlantic ocean. We perform a thorough linear stability analysis and identify the unstable modes of the jet, which we use then for initialisation of fully nonlinear numerical simulations. In this way, we determine nonlinear evolution of unstable perturbations of the jet, both in the “dry” and moist-convective environments and highlight essential differences between the two cases. We identify a mechanism of formation of intense lower-layer cyclonic vortices at the northern flank of the jet and determine the influence of the land-sea contrast upon this process.

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Language(s): eng - English
 Dates: 2021-092021-09-172022-03
 Publication Status: Finally published
 Pages: 22
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: MDB-ID: No data to archive
DOI: 10.1080/03091929.2021.1959574
PIKDOMAIN: RD1 - Earth System Analysis
Organisational keyword: RD1 - Earth System Analysis
Working Group: Earth System Modes of Operation
Working Group: Long-Term Dynamics of the Earth System
Research topic keyword: Atmosphere
Research topic keyword: Extremes
Research topic keyword: Nonlinear Dynamics
Research topic keyword: Weather
Regional keyword: Africa
 Degree: -

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Title: Geophysical and Astrophysical Fluid Dynamics
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 116 (1) Sequence Number: - Start / End Page: 56 - 77 Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/geophysical-Astrophysical-fluid-dynamics
Publisher: Taylor & Francis