elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Influence of a stratospheric turbulence layer on the penetration of mountain waves into the middle atmosphere

Dörnbrack, Andreas and Bramberger, Martina and Rapp, Markus and Wagner, Johannes and Kaifler, Bernd and Kaifler, Natalie (2015) Influence of a stratospheric turbulence layer on the penetration of mountain waves into the middle atmosphere. 2015 AGU Fall Meeting, 14.-18. Dez. 2015, San Francisco, USA.

Full text not available from this repository.

Official URL: https://agu.confex.com/agu/fm15/meetingapp.cgi/Paper/74260

Abstract

During the DEEPWAVE campaign, large-amplitude mesospheric temperature fluctuations were observed by the ground-based Rayleigh lidar at Lauder, NZ on July 4 2014. For the same day, coordinated aircraft observations of the DLR Falcon and the NSF/NCAR GV report one of the largest wave events measured by both aircraft with vertical velocity amplitudes in excess of 6 m/s around the tropopause level at around 11 km altitude. Mesoscale numerical simulations indicate the existence of breaking hydrostatic gravity waves between about 15 km to 25 km altitude above the southern island. In most cases, the breaking regions are linked with individual orographic peaks. As time evolves, they generate a stratospheric turbulent layer extending over the whole island. Nevertheless, the wave attenuation in this layer cannot prevent the penetration of mountain waves to higher altitudes and the simulations reveal a boost of wave amplitudes above about 30 km altitude. Furthermore, the mesoscale numerical model simulates the excitation of secondary gravity waves from the turbulent layer. Obviously, the small-scale dynamics in this stratospheric turbulence layer influences the momentum deposition and the spatial scales of the waves. Therefore, this layer plays a central role in defining the spectrum of gravity waves penetrating to the mesosphere. By a combination of a multitude of ground-based and airborne measurements, mesoscale (ECMWF's IFS, WRF and Unified Model of UK MetOffice) as well as idealized numerical simulations we investigate the role of the breaking region on the deep propagation of mountain waves over New Zealand.

Item URL in elib:https://elib.dlr.de/102233/
Document Type:Conference or Workshop Item (Poster)
Title:Influence of a stratospheric turbulence layer on the penetration of mountain waves into the middle atmosphere
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dörnbrack, AndreasDLR, IPAUNSPECIFIED
Bramberger, MartinaDLR, IPAUNSPECIFIED
Rapp, MarkusDLR, IPAUNSPECIFIED
Wagner, JohannesDLR, IPAUNSPECIFIED
Kaifler, BerndDLR, IPAUNSPECIFIED
Kaifler, NatalieDLR, IPAUNSPECIFIED
Date:14 December 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:DEEPWAVE, middle atmosphere, mountain waves
Event Title:2015 AGU Fall Meeting
Event Location:San Francisco, USA
Event Type:international Conference
Event Dates:14.-18. Dez. 2015
Organizer:American Geophysical Union
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
Deposited By: Kaifler, Bernd
Deposited On:15 Jan 2016 17:15
Last Modified:10 May 2016 23:42

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.