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Stratospheric mountain waves trailing across Northern Europe

Dörnbrack, Andreas (2021) Stratospheric mountain waves trailing across Northern Europe. Journal of the Atmospheric Sciences (78), pp. 2835-2857. American Meteorological Society. doi: 10.1175/JAS-D-20-0312.1. ISSN 0022-4928.

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Official URL: https://dx.doi.org/10.1175/JAS-D-20-0312.1

Abstract

Planetary waves disturbed the hitherto stable Arctic stratospheric polar vortex in the middle of January 2016 in such a way that unique tropospheric and stratospheric flow conditions for vertically and horizontally propagating mountain waves developed. Coexisting strong low-level westerly winds across almost all European mountain ranges plus the almost zonally aligned polar-front jet created these favorable conditions for deeply propagating gravity waves. Furthermore, the northward displacement of the polar night jet resulted in a widespread coverage of stratospheric mountain waves trailing across Northern Europe. This paper describes the particular meteorological setting by analyzing the tropospheric and stratospheric flows based on the ERA5 data. The potential of the flow for exciting internal gravity waves from nonorographic sources is evaluated across all altitudes by considering various indices to indicate flow imbalances as d, Ro, Roz, Ro?, and DNBE. The analyzed gravity waves are described and characterized. The main finding of this case study is the exceptionally vast extension of the mountain waves trailing to high latitudes originating from the flow across the mountainous sources that are located at about 458N. The magnitudes of the simulated stratospheric temperature perturbations attain values larger than 10 K and are comparable to values as documented by recent case studies of large-amplitude mountain waves over South America. The zonal means of the resolved and parameterized stratospheric wave drag during the mountain wave event peak at 24.5 and 232.2 m s21 day21, respectively.

Item URL in elib:https://elib.dlr.de/193583/
Document Type:Article
Title:Stratospheric mountain waves trailing across Northern Europe
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Dörnbrack, AndreasDLR, IPAhttps://orcid.org/0000-0003-0936-0216UNSPECIFIED
Date:23 June 2021
Journal or Publication Title:Journal of the Atmospheric Sciences
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1175/JAS-D-20-0312.1
Page Range:pp. 2835-2857
Publisher:American Meteorological Society
ISSN:0022-4928
Status:Published
Keywords:Atmosphere; Mountain waves; Stratosphere; Numerical weather prediction/forecasting; Reanalysis data
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Middle Atmosphere
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Ziegele, Brigitte
Deposited On:26 Jan 2023 10:48
Last Modified:05 Dec 2023 10:09

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