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Airborne Coherent Doppler Wind Lidar measurements of vertical and horizontal wind speeds for the investigation of gravity waves

Witschas, Benjamin and Rahm, Stephan and Wagner, Johannes and Dörnbrack, Andreas (2016) Airborne Coherent Doppler Wind Lidar measurements of vertical and horizontal wind speeds for the investigation of gravity waves. 18th Coherent Laser Radar Conference, 27. Jun. - 01. Jul. 2016, Boulder, Colorado, USA.

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Abstract

Gravity waves are well known phenomena in the atmosphere, but there is still a lack of knowledge of their life cycle including excitation, propagation and dissipation mechanisms. In order to investigate these topics, DLR’s coherent Doppler wind lidar system was recently deployed during 3 airborne campaigns on the Falcon F20 research aircraft, namely the GW-LCYCLE I campaign (Kiruna, Sweden, December 2013), the DEEPWAVE campaign (Christchurch, New Zealand, June/July 2014) and the GW-LCYCLE II campaign (Kiruna, Sweden, January/February 2016). In this paper, a case study based on a research flight performed during GW-LCYCLE I is discussed and a method for correcting horizontal wind contribution in the vertical wind retrieval based on ECMWF data is introduced. The remaining systematic error of the retrieved vertical wind is estimated to be less than 10 cm/s. A measurement of a flight leg across the Scandinavian mountain ridge is used to characterize gravity waves during strong forcing conditions. The measured vertical wind reaches amplitudes of larger than ± 3 m/s and horizontal wavelengths of 10 km to 20 km. A comparison with WRF-model calculations shows a quite good representation of the horizontal structure of the vertical wind. The amplitude however is obviously underestimated by a factor of 2 and shows maximum wind speeds of ± 1.5 m/s.

Item URL in elib:https://elib.dlr.de/105538/
Document Type:Conference or Workshop Item (Speech)
Title:Airborne Coherent Doppler Wind Lidar measurements of vertical and horizontal wind speeds for the investigation of gravity waves
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Witschas, BenjaminDLR, IPAUNSPECIFIED
Rahm, StephanDLR, IPAUNSPECIFIED
Wagner, JohannesDLR, IPAUNSPECIFIED
Dörnbrack, AndreasDLR, IPAUNSPECIFIED
Date:2016
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Airborne, Wind Lidar, Doppler Lidar, Gravity Waves
Event Title:18th Coherent Laser Radar Conference
Event Location:Boulder, Colorado, USA
Event Type:international Conference
Event Dates:27. Jun. - 01. Jul. 2016
Organizer:CIRES
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 - Projekt ADM
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Witschas, Dr. Benjamin
Deposited On:03 Aug 2016 09:28
Last Modified:31 Jul 2019 20:02

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