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Intercomparison of wind observations from the European Space Agency's Aeolus satellite mission and the ALADIN Airborne Demonstrator

Lux, Oliver and Lemmerz, Christian and Weiler, Fabian and Marksteiner, Uwe and Witschas, Benjamin and Rahm, Stephan and Geiß, Alexander and Reitebuch, Oliver (2020) Intercomparison of wind observations from the European Space Agency's Aeolus satellite mission and the ALADIN Airborne Demonstrator. Atmospheric Measurement Techniques (AMT), 13, pp. 2075-2097. Copernicus Publications. DOI: 10.5194/amt-13-2075-2020 ISSN 1867-1381

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Official URL: https://www.atmos-meas-tech.net/13/2075/2020/

Abstract

Shortly after the successful launch of the European Space Agency's wind mission Aeolus, co-located airborne wind lidar observations were performed in central Europe; these observations employed a prototype of the satellite instrument - the ALADIN (Atmospheric LAser Doppler INstrument) Airborne Demonstrator (A2D). Like the direct-detection Doppler wind lidar on-board Aeolus, the A2D is composed of a frequency-stabilized ultra-violet (UV) laser, a Cassegrain telescope and a dual-channel receiver to measure line-of-sight (LOS) wind speeds by analysing both Mie and Rayleigh backscatter signals. In the framework of the first airborne validation campaign after the launch and still during the commissioning phase of the mission, four coordinated flights along the satellite swath were conducted in late autumn of 2018, yielding wind data in the troposphere with high coverage of the Rayleigh channel. Owing to the different measurement grids and LOS viewing directions of the satellite and the airborne instrument, intercomparison with the Aeolus wind product requires adequate averaging as well as conversion of the measured A2D LOS wind speeds to the satellite LOS (LOS*). The statistical comparison of the two instruments shows a positive bias (of 2.6 m/s) of the Aeolus Rayleigh winds (measured along its LOS*) with respect to the A2D Rayleigh winds as well as a standard deviation of 3.6 m/s. Considering the accuracy and precision of the A2D wind data, which were determined from comparison with a highly accurate coherent wind lidar as well as with the European Centre for Medium-Range Weather Forecasts (ECMWF) model winds, the systematic and random errors of the Aeolus LOS* Rayleigh winds are 1.7 and 2.5 m/s respectively. The paper also discusses the influence of different threshold parameters implemented in the comparison algorithm as well as an optimization of the A2D vertical sampling to be used in forthcoming validation campaigns.

Item URL in elib:https://elib.dlr.de/134933/
Document Type:Article
Title:Intercomparison of wind observations from the European Space Agency's Aeolus satellite mission and the ALADIN Airborne Demonstrator
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lux, OliverDLR, IPAhttps://orcid.org/0000-0003-1491-0323
Lemmerz, ChristianDLR, IPAUNSPECIFIED
Weiler, FabianDLR, IPAUNSPECIFIED
Marksteiner, UweDLR, IPAhttps://orcid.org/0000-0002-4335-922X
Witschas, BenjaminDLR, IPAhttps://orcid.org/0000-0001-7993-1470
Rahm, StephanDLR, IPAUNSPECIFIED
Geiß, AlexanderUniv. MünchenUNSPECIFIED
Reitebuch, OliverDLR, IPAhttps://orcid.org/0000-0002-8503-0094
Date:23 April 2020
Journal or Publication Title:Atmospheric Measurement Techniques (AMT)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:13
DOI :10.5194/amt-13-2075-2020
Page Range:pp. 2075-2097
Publisher:Copernicus Publications
ISSN:1867-1381
Status:Published
Keywords:Aeolus, satellite validation, airborne campaigns, ALADIN Airborne Demonstrator, Falcon, Doppler wind lidar
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
Deposited By: Lux, Dr. Oliver
Deposited On:15 May 2020 15:59
Last Modified:15 May 2020 15:59

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