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Correction of wind bias for the lidar on-board Aeolus using telescope temperatures

Weiler, Fabian und Rennie, Michael und Kanitz, Thomas und Isaksen, Lars und Checa, Elena und de Kloe, Jos und Ngozi, Okunde und Reitebuch, Oliver (2021) Correction of wind bias for the lidar on-board Aeolus using telescope temperatures. Atmospheric Measurement Techniques (AMT), 14 (11), Seiten 7167-7185. Copernicus Publications. doi: 10.5194/amt-14-7167-2021. ISSN 1867-1381.

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Offizielle URL: https://amt.copernicus.org/articles/14/7167/2021/

Kurzfassung

The European Space Agency satellite Aeolus provides continuous profiles of the horizontal line-of-sight wind component at a global scale. It was successfully launched into space in August 2018 with the goal to improve numerical weather prediction (NWP). Aeolus data has already been successfully assimilated into several NWP models and has already helped to significantly improve the quality of weather forecasts. To achieve this major milestone the identification and correction of several systematic error sources was necessary. One of them is related to small temperatures fluctuations across the 1.5 m diameter primary mirror of the telescope which cause varying wind biases along the orbit of up to 8 m/s. This paper presents a detailed overview of the influence of the telescope temperature variations on the Aeolus wind products and describes the approach to correct for this systematic error source in the operational near-real-time (NRT) processing. It was shown that the telescope temperature variations along the orbit are due to changes of the top-of-atmosphere short- and long-wave radiation of the Earth and the response of the telescope’s thermal control system to that. To correct for this effect ECMWF model-equivalent winds are used as bias reference to describe the wind bias in a multiple linear regression model as a function of various temperature sensors located on the primary telescope mirror. This correction scheme has been in operational use at ECMWF since April 2020 and is capable of reducing a large part of the telescope-induced wind bias. In cases where the influence of the temperature variations is particularly strong it was shown that the bias correction can improve the orbital bias variation by up to 53 %. Moreover, it was demonstrated that the approach of using ECMWF model-equivalent winds is justified by the fact that the global bias of models u-component winds w.r.t to radiosondes is smaller than 0.3 m/s. However, this paper also presents the alternative of using Aeolus ground return winds which serve as zero wind reference in the multiple linear regression model. The results show that the approach based on ground return winds only performs 10.8 % worse than the ECMWF model-based approach and thus has good potential for future applications for upcoming reprocessing campaigns or even in the NRT processing of Aeolus wind products.

elib-URL des Eintrags:https://elib.dlr.de/145257/
Dokumentart:Zeitschriftenbeitrag
Titel:Correction of wind bias for the lidar on-board Aeolus using telescope temperatures
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Weiler, FabianDLR, IPANICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Rennie, MichaelECMWF, Reading, UKNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Kanitz, ThomasESA/ESTEC, Noordwijk, NLNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Isaksen, LarsECMWF, Reading, UKNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Checa, ElenaESA/ESTEC, Noordwijk, NLNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
de Kloe, JosKNMI, De Bilt, NLNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Ngozi, OkundeKNMI, De Bilt, NLNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Reitebuch, OliverDLR, IPAhttps://orcid.org/0000-0002-8503-0094NICHT SPEZIFIZIERT
Datum:17 November 2021
Erschienen in:Atmospheric Measurement Techniques (AMT)
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:14
DOI:10.5194/amt-14-7167-2021
Seitenbereich:Seiten 7167-7185
Verlag:Copernicus Publications
Name der Reihe:Aeolus data and their application (AMT/ACP/WCD inter-journal SI)
ISSN:1867-1381
Status:veröffentlicht
Stichwörter:Aeolus, Bias correction, M1 temperatures
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Projekt ADM III Forts.
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: Weiler, Fabian
Hinterlegt am:05 Nov 2021 15:54
Letzte Änderung:03 Jun 2024 12:29

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