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Does strong tropospheric forcing cause large amplitude mesospheric gravity waves? A Deepwave Case Study

Bramberger, Martina and Dörnbrack, Andreas and Gisinger, Sonja and Kaifler, Bernd and Portele, Tanja and Rapp, Markus and Stiperski, Ivana (2015) Does strong tropospheric forcing cause large amplitude mesospheric gravity waves? A Deepwave Case Study. 33rd International Conference on Alpine Meteorology, 31. Aug. - 4. Sep. 2015, Innsbruck, Austria. (Unpublished)

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Official URL: https://www.uibk.ac.at/congress/icam2015/abstracts_poster_presentations.htm#P2.21

Abstract

The DEEPWAVE (deep-propagating wave experiment) campaign was designed for an airborne and ground-based exploration of gravity waves from their tropospheric sources up to their dissipation at high altitudes. It was performed in and around New Zealand from 24 May till 27 July 2014, being the first comprehensive field campaign of this kind. A variety of airborne instruments was deployed onboard the research aircraft NSF/NCAR Gulfstream V (GV) and the DLR Falcon. Additionally, ground-based measurements were conducted at different sites across the southern island of New Zealand, including the DLR Rayleigh lidar located at Lauder (45.04 S, 169.68 E). We focus on the intensive observing period (IOP) 10 on the 4 July 2014, when strong WSW winds of about 40 m/s at 700 hPa provided intense forcing conditions for mountain waves. At tropopause level, the horizontal wind exceeded 50 m/s and favored the vertical propagation of gravity waves into the stratosphere. The DLR Rayleigh Lidar measured temperature fluctuations with peak-to-peak amplitudes of about 20 K in the mesosphere (60 km to 80 km MSL) over a period of more than 10 hours. Two research flights were conducted by the DLR Falcon (Falcon Flight 04 and 05) during this period with straight transects (Mt. Aspiring 2a) over New Zealand´s Alps at three different flight-levels around the tropopause (approx. 11 km MSL). These research flights were coordinated with the GV (Research Flight 16) where the largest mountain wave amplitudes at flight-level (approx. 13 km MSL) were measured during DEEPWAVE. Additionally a first analysis of Falcon's in-situ flight-level data revealed amplitudes in the vertical wind larger than 4 m/s at all altitudes in the vicinity of the highest peaks of the Southern Alps. Here, we present a comprehensive picture of the gravity wave characteristics and propagation properties during this interesting gravity wave event. We use the airborne observations combined with a comprehensive set of ground-based measurements consisting of 13 radiosoundings (1.5 hourly interval) together with the DLR Rayleigh lidar. To cover the altitude range from the troposphere to the mesosphere, high-resolution (1 hourly) ECMWF analyses and forecasts are used to estimate the propagation conditions of the excited mountain waves. The goal of our investigation is to find out whether the large amplitude mesospheric gravity waves are caused by the strong tropospheric forcing.

Item URL in elib:https://elib.dlr.de/111611/
Document Type:Conference or Workshop Item (Poster)
Title:Does strong tropospheric forcing cause large amplitude mesospheric gravity waves? A Deepwave Case Study
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bramberger, Martinadlr, ipaUNSPECIFIED
Dörnbrack, AndreasDLR, IPAUNSPECIFIED
Gisinger, Sonjadlr, ipahttps://orcid.org/0000-0001-8188-4458
Kaifler, BerndDLR, IPAUNSPECIFIED
Portele, Tanjadlr, ipaUNSPECIFIED
Rapp, MarkusDLR, IPAUNSPECIFIED
Stiperski, IvanaInstitut für Meteorologie und Geophysik, Univ. InnsbruckUNSPECIFIED
Date:1 September 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:DEEPWAVE
Event Title:33rd International Conference on Alpine Meteorology
Event Location:Innsbruck, Austria
Event Type:national Conference
Event Dates:31. Aug. - 4. Sep. 2015
Organizer:Institute of Meteorology of and Geophysics, University of Innsbruck
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 > Transport Meteorology
Institute of Atmospheric Physics > Lidar
Institute of Atmospheric Physics
Deposited By: Kaifler, Dr. Natalie
Deposited On:24 Mar 2017 11:09
Last Modified:24 Mar 2017 11:09

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