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Long-term lidar observations of wintertime gravity wave activity over northern Sweden

Ehard, Benedikt and Achtert, Peggy and Gumbel, Jörg (2014) Long-term lidar observations of wintertime gravity wave activity over northern Sweden. Annales Geophysicae, pp. 1395-1405. Copernicus Publications. DOI: [10.5194/angeo-32-1395-2014] ISSN 0992-7689

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Official URL: http://www.ann-geophys.net/32/1395/2014/

Abstract

This paper presents an analysis of gravity wave activity over northern Sweden as deduced from 18 years of wintertime lidar measurements at Esrange (68� N, 21� E). Gravity wave potential energy density (GWPED) was used to characterize the strength of gravity waves in the altitude regions 30–40 km and 40–50 km. The obtained values exceed previous observations reported in the literature. This is suggested to be due to Esrange’s location downwind of the Scandinavian mountain range and due to differences in the various methods that are currently used to retrieve gravity wave parameters. The analysis method restricted the identification of the dominating vertical wavelengths to a range from 2 to 13 km. No preference was found for any wavelength in this window. Monthly mean values of GWPED show that most of the gravity waves’ energy dissipates well below the stratopause and that higher altitude regions show only small dissipation rates of GWPED. Our analysis does not reproduce the previously reported negative trend in gravity wave activity over Esrange. The observed interannual variability of GWPED is connected to the occurrence of stratospheric warmings with generally lower wintertime mean GWPED during years with major stratospheric warmings.A bimodal GWPED occurrence frequency indicates that gravity wave activity at Esrange is affected by both ubiquitouswave sources and orographic forcing.

Item URL in elib:https://elib.dlr.de/92533/
Document Type:Article
Title:Long-term lidar observations of wintertime gravity wave activity over northern Sweden
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ehard, BenediktDLR, IPAUNSPECIFIED
Achtert, PeggyUNSPECIFIEDUNSPECIFIED
Gumbel, JörgUNSPECIFIEDUNSPECIFIED
Date:13 November 2014
Journal or Publication Title:Annales Geophysicae
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :[10.5194/angeo-32-1395-2014]
Page Range:pp. 1395-1405
Publisher:Copernicus Publications
ISSN:0992-7689
Status:Published
Keywords:Meteorology and atmospheric dynamics (waves and tides; instruments and techniques)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben LIDAR-Forschung und -Entwicklung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics
Institute of Atmospheric Physics > Lidar
Deposited By: Ehard, Benedikt
Deposited On:01 Dec 2014 11:30
Last Modified:08 Mar 2018 18:47

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