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First validation of Aeolus wind observations by airborne Doppler wind lidar measurements

Witschas, Benjamin and Lemmerz, Christian and Geiss, Alexander and Lux, Oliver and Marksteiner, Uwe and Rahm, Stephan and Reitebuch, Oliver and Weiler, Fabian (2020) First validation of Aeolus wind observations by airborne Doppler wind lidar measurements. Atmospheric Measurement Techniques (AMT) (13), pp. 2381-2396. Copernicus Publications. DOI: 10.5194/amt-13-2381-2020 ISSN 1867-1381

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Official URL: https://www.atmos-meas-tech.net/13/2381/2020/

Abstract

Soon after the launch of Aeolus on 22 August 2018, the first ever wind lidar in space developed by the European Space Agency (ESA) has been providing profiles of the component of the wind vector along the instrument’s line of sight (LOS) on a global scale. In order to validate the quality of Aeolus wind observations, the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt e.V., DLR) recently performed two airborne campaigns over central Europe deploying two different Doppler wind lidars (DWLs) on board the DLR Falcon aircraft. The first campaign – WindVal III – was conducted from 5 November 2018 until 5 December 2018 and thus still within the commissioning phase of the Aeolus mission. The second campaign – AVATARE (Aeolus Validation Through Airborne Lidars in Europe) – was performed from 6 May 2019 until 6 June 2019. Both campaigns were flown out of the DLR site in Oberpfaffenhofen, Germany, during the evening hours for probing the ascending orbits. All together, 10 satellite underflights with 19 flight legs covering more than 7500 km of Aeolus swaths were performed and used to validate the early-stage wind data product of Aeolus by means of collocated airborne wind lidar observations for the first time. For both campaign data sets, the statistical comparison of Aeolus horizontal line-of-sight (HLOS) observations and the corresponding wind observations of the reference lidar (2 µm DWL) on board the Falcon aircraft shows enhanced systematic and random errors compared with the bias and precision requirements defined for Aeolus. In particular, the systematic errors are determined to be 2.1 m s−1 (Rayleigh) and 2.3 m s−1 (Mie) for WindVal III and −4:6 m s−1 (Rayleigh) and −0:2 m s−1 (Mie) for AVATARE. The corresponding random errors are determined to be 3.9 m s−1 (Rayleigh) and 2.0 m s−1 (Mie) for WindVal III and 4.3 m s−1 (Rayleigh) and 2.0 m s−1 (Mie) for AVATARE. The Aeolus observations used here were acquired in an altitude range up to 10 km and have mainly a vertical resolution of 1 km (Rayleigh) and 0.5 to 1.0 km (Mie) and a horizontal resolution of 90 km (Rayleigh) and down to 10 km (Mie). Potential reasons for those errors are analyzed and discussed.

Item URL in elib:https://elib.dlr.de/134950/
Document Type:Article
Title:First validation of Aeolus wind observations by airborne Doppler wind lidar measurements
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Witschas, BenjaminDLR, IPAhttps://orcid.org/0000-0001-7993-1470
Lemmerz, ChristianDLR, IPAUNSPECIFIED
Geiss, AlexanderUniv. MünchenUNSPECIFIED
Lux, OliverDLR, IPAhttps://orcid.org/0000-0003-1491-0323
Marksteiner, UweDLR, IPAhttps://orcid.org/0000-0002-4335-922X
Rahm, StephanDLR, IPAUNSPECIFIED
Reitebuch, OliverDLR, IPAhttps://orcid.org/0000-0002-8503-0094
Weiler, FabianDLR, IPAUNSPECIFIED
Date:15 May 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
DOI :10.5194/amt-13-2381-2020
Page Range:pp. 2381-2396
Publisher:Copernicus Publications
ISSN:1867-1381
Status:Published
Keywords:Wind Lidar, Aeolus, Validation, Airborne, Campaigns
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: Witschas, Dr. Benjamin
Deposited On:15 May 2020 18:04
Last Modified:18 May 2020 12:20

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