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Lidar observations of gravity waves in the middle atmosphere over Lauder, New Zealand

Rapp, Markus and Kaifler, Bernd and Kaifler, Natalie and Ehard, Benedikt and Dörnbrack, Andreas (2015) Lidar observations of gravity waves in the middle atmosphere over Lauder, New Zealand. 26th IUGG General Assembly 2015, 22. Juni - 2. Juli 2015, Prague, Czech Republic.

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Official URL: https://www.czech-in.org/cm/IUGG/CM.NET.WebUI/CM.NET.WEBUI.scpr/SCPRfunctiondetail.aspx?confID=05000000-0000-0000-0000-000000000053&sesID=05000000-0000-0000-0000-000000003518&absID=07000000-0000-0000-0000-000000025351

Abstract

The DEEP propagating gravity WAVE experiment was carried out over New Zealand in June/July 2014. As part of the DEEPWAVE campaign, we conducted extensive observations with a ground-based Rayleigh lidar at Lauder (45°S, 170°E). The Lauder site is in the proximity of the polar vortex, with sufficiently high horizontal wind speeds in austral winter that allow for deep propagating gravity waves. Moreover, Lauder is located just east of the Southern Alps. Prevailing westerlies facilitate excitation of large orographic gravity waves which can be observed by lidar. We report on gravity waves detected in high-resolution temperature measurements in the altitude range 20-90 km. Spectral filtering of the temperature data reveals large-scale waves with periods of several hours as well as small-scale waves with periods down to 10-20 minutes. Observed vertical wave lengths and periods are retrieved from the 2D Fourier transform of measured temperature. Using this information to calculate phase speeds, waves are then classified into categories which may be associated with different wave types, i.e. waves originating from different wave sources. We present first results from ~500 observation hours acquired between 19 June and 6 November 2014. We identify orographic wave events, deep propagating non-orographic waves, and small-scale waves which possibly result from breaking large-scale waves. Results are compared with ECMWF data. We find that large-scale waves are surprisingly well represented in ECMWF up to the stratosphere.

Item URL in elib:https://elib.dlr.de/111606/
Document Type:Conference or Workshop Item (Speech)
Title:Lidar observations of gravity waves in the middle atmosphere over Lauder, New Zealand
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rapp, MarkusDLR, IPAUNSPECIFIED
Kaifler, BerndDLR, IPAhttps://orcid.org/0000-0002-5891-242X
Kaifler, NatalieDLR, IPAhttps://orcid.org/0000-0002-3118-6480
Ehard, BenediktDLR, IPAhttps://orcid.org/0000-0003-0517-8134
Dörnbrack, AndreasDLR, IPAhttps://orcid.org/0000-0003-0936-0216
Date:29 June 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:DEEPWAVE, gravity waves
Event Title:26th IUGG General Assembly 2015
Event Location:Prague, Czech Republic
Event Type:international Conference
Event Dates:22. Juni - 2. Juli 2015
Organizer:International Union of Geodesy and Geophysics
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
Deposited By: Kaifler, Dr. Natalie
Deposited On:23 Mar 2017 15:19
Last Modified:23 Mar 2017 15:19

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