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Characteristics of gravity waves and influences of source conditions on mountain wave penetration into the stratosphere and mesospahere above New Zealand

Kaifler, Bernd and Kaifler, Natalie and Ehard, Benedikt and Dörnbrack, Andreas and Gisinger, Sonja and Rapp, Markus and Fritts, David C. and Taylor, Mike (2016) Characteristics of gravity waves and influences of source conditions on mountain wave penetration into the stratosphere and mesospahere above New Zealand. SPARC Gravity Wave Symposium, 16.-20. May 2016, Pennsylvania, USA.

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Abstract

We present atmospheric gravity wave (GW) measurements obtained by a Rayleigh/Raman lidar at Lauder, New Zealand, during and after the Deep Propagating Gravity Wave Experiment campaign. Gravity wave characteristics are derived from 557 h of lidar data acquired over a period of five months in winter 2014. Enhancements in gravity wave activity occurred in sporadic intervals lasting a few days. We employ spectral analysis of lidar temperature measurements to detect and sort wave packets into specific classes corresponding to propagating gravity waves and quasi-stationary gravity waves (mountain waves). Large-amplitude mountain waves are detected during periods with high tropospheric wind speeds perpendicular to the Southern Alps. During the strongest event (29 July to 1 August) amplitudes in excess of 15 K were observed at 40 km altitude. Surprisingly, the largest response at mesospheric altitudes is observed for conditions with low to moderate mountain wave forcing. Large-amplitude mountain waves excited by large cross-mountain wind speeds often do not penetrate into the mesosphere, either due to refraction away from New Zealand or wave breaking and dissipation in the stratosphere.

Item URL in elib:https://elib.dlr.de/108150/
Document Type:Conference or Workshop Item (Speech)
Title:Characteristics of gravity waves and influences of source conditions on mountain wave penetration into the stratosphere and mesospahere above New Zealand
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kaifler, BerndDLR, IPAUNSPECIFIED
Kaifler, NatalieDLR, IPAUNSPECIFIED
Ehard, BenediktDLR, IPAhttps://orcid.org/0000-0003-0517-8134
Dörnbrack, AndreasDLR, IPAUNSPECIFIED
Gisinger, SonjaDLR, IPAUNSPECIFIED
Rapp, MarkusDLR, IPAUNSPECIFIED
Fritts, David C.gats inc./boulderUNSPECIFIED
Taylor, Mikeutah state university, u.s.aUNSPECIFIED
Date:16 May 2016
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:lidar; middle atmosphere; gravity waves; mountain waves
Event Title:SPARC Gravity Wave Symposium
Event Location:Pennsylvania, USA
Event Type:international Conference
Event Dates:16.-20. May 2016
Organizer:Penn State
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
Institute of Atmospheric Physics > Lidar
Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Kaifler, Dr. Natalie
Deposited On:22 Nov 2016 08:26
Last Modified:22 Nov 2016 08:26

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