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Horizontal propagation of large-amplitude mountain waves into the polar night jet

Ehard, Benedikt and Kaifler, Bernd and Dörnbrack, Andreas and Preusse, Peter and Eckermann, Stephen D. and Bramberger, Martina and Gisinger, Sonja and Kaifler, Natalie and Liley, Ben and Wagner, Johannes and Rapp, Markus (2017) Horizontal propagation of large-amplitude mountain waves into the polar night jet. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, pp. 1-14. Wiley. DOI: 10.1002/2016JD025621 ISSN 2169-897X

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/2016JD025621/abstract

Abstract

We analyze a large-amplitude mountain wave event, which was observed by a ground-based lidar above New Zealand between 31 July and 1 August 2014. Besides the lidar observations, European Centre for Medium-Range Weather Forecasts (ECMWF) data, satellite observations, and ray tracing simulations are utilized in this study. It is found that the propagation of mountain waves into the middle atmosphere is influenced by two different processes at different stages of the event. At the beginning of the event, instabilities in a weak wind layer cause wave breaking in the lower stratosphere. During the course of the event the mountain waves propagate to higher altitudes and are refracted southward toward the polar night jet due to the strong meridional shear of the zonal wind. As the waves propagate out of the observational volume, the ground-based lidar observes no mountain waves in the mesosphere. Ray tracing simulations indicate that the mountain waves propagated to mesospheric altitudes south of New Zealand where the polar night jet advected the waves eastward. These results underline the importance of considering horizontal propagation of gravity waves, e.g., when analyzing locally confined observations of gravity waves.

Item URL in elib:https://elib.dlr.de/111011/
Document Type:Article
Title:Horizontal propagation of large-amplitude mountain waves into the polar night jet
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ehard, Benediktdlr, ipahttps://orcid.org/0000-0003-0517-8134
Kaifler, Bernddlr, ipaUNSPECIFIED
Dörnbrack, Andreasdlr, ipaUNSPECIFIED
Preusse, Peterresearch center jülich, iek7, jülich, germanyUNSPECIFIED
Eckermann, Stephen D.nrl, washington, dc, usaUNSPECIFIED
Bramberger, Martinadlr, ipaUNSPECIFIED
Gisinger, Sonjadlr, ipaUNSPECIFIED
Kaifler, Nataliedlr, ipaUNSPECIFIED
Liley, Benniwa, lauder, new zealandUNSPECIFIED
Wagner, Johannesdlr, ipaUNSPECIFIED
Rapp, Markusdlr, ipaUNSPECIFIED
Date:2017
Journal or Publication Title:JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
DOI :10.1002/2016JD025621
Page Range:pp. 1-14
Publisher:Wiley
ISSN:2169-897X
Status:Published
Keywords:Gravity waves, mountian waves, lidar, middle atmosphere
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 Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Institute of Atmospheric Physics > Transport Meteorology
Institute of Atmospheric Physics
Deposited By: Ehard, Benedikt
Deposited On:09 Feb 2017 08:51
Last Modified:08 Mar 2018 18:35

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