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Towards an assessment of Aeolus' Mie radiometric performance

Marksteiner, Uwe und Baars, Holger und Reitebuch, Oliver (2022) Towards an assessment of Aeolus' Mie radiometric performance. Aeolus 3rd Anniversary Conference, 28. Mär. - 01. Apr. 2022, Taormina, Italien.

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Offizielle URL: https://az659834.vo.msecnd.net/eventsairwesteuprod/production-nikal-public/01caf8f009544ca8b08a23c2185cabef

Kurzfassung

The intensity of the return signal acquired by Aeolus depends on numerous factors such as the output laser energy, the state of the atmosphere along the line of sight, the characteristics of the target, the optical elements of the instrument and the alignment of laser beam and telescope. Already at an early stage of the mission, it was found that a significant part of the atmospheric backscatter signal was missing on the Rayleigh channel. Whereas the properties of the transmission and reception path of the Rayleigh channel can be simulated to a reasonable extent by the Aeolus End-To-End Simulator (E2S), it is much more difficult to align the simulation to the actual characteristics of the Mie channel, in particular to the transmission function of the Fizeau spectrometer. As a first attempt to assess the radiometric performance of Aeolus Mie channel, we are trying to derive a ratio between simulated and actual Aeolus signals. Therefore, we compare useful signals obtained with the E2S against measurements made with Aeolus in aerosol-laden atmospheric scenes. In this context, the backscatter and extinction measurements of portable ground-based Raman lidar systems from PollyNET as well as temperature and pressure information from external sources represent essential inputs for the simulation. Elevated, optically thick, vertically extended and preferably homogeneous aerosol layers are considered as the most suitable target. With the Raman lidars sensing a drifting aerosol layer from a fixed location and Aeolus as a mobile instrument sampling a quasi-fixed layer, optimisation is needed concerning the match of geolocation between the ground-based and space-borne measurements. Present ratios derived from scenes over Leipzig (Germany) and Al Dhaid (United Arabic Emirates) range from 0.6 to 0.9 (less measured signal than simulated). These factors show relative uncertainties of at least ±20% with expected error contributions based on the differences between Aeolus measurements, ground based measurements and simulation, i.e. location, heterogeneity of aerosol layers, E2S input parameters, assumptions in the handling of depolarised signals, potential cloud cover at altitudes higher than the measurement range, additional noise sources, etc. Reducing the number of contributors as well as their magnitude poses the biggest challenge for a reliable assessment of the Mie radiometric performance, which might only be achievable via statistical analyses on a larger number of cases.

elib-URL des Eintrags:https://elib.dlr.de/190160/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Towards an assessment of Aeolus' Mie radiometric performance
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Marksteiner, UweDLR, IPAhttps://orcid.org/0000-0002-4335-922XNICHT SPEZIFIZIERT
Baars, Holgerbaars (at) tropos.dehttps://orcid.org/0000-0002-2316-8960NICHT SPEZIFIZIERT
Reitebuch, OliverDLR, IPAhttps://orcid.org/0000-0002-8503-0094NICHT SPEZIFIZIERT
Datum:28 März 2022
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Aeolus, satellite, simulator, lidar, aerosol, depolarisation, backscatter, Mie
Veranstaltungstitel:Aeolus 3rd Anniversary Conference
Veranstaltungsort:Taormina, Italien
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:28. Mär. - 01. Apr. 2022
Veranstalter :ESA
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 (alt), R - Projekt ADM III Forts.
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: Marksteiner, Dr. Uwe
Hinterlegt am:15 Nov 2022 13:19
Letzte Änderung:15 Nov 2022 13:19

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