Validation of the Aeolus L2B wind product with airborne wind lidar measurements in the polar North Atlantic region and in the tropics
During the first three years of European Space Agency’s Aeolus mission, the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt, DLR) performed four airborne campaigns deploying two different Doppler wind lidars (DWL) on-board the DLR Falcon aircraft, aiming to validate the quality of...
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ftcopernicus:oai:publications.copernicus.org:amtd105758 2023-05-15T16:49:37+02:00 Validation of the Aeolus L2B wind product with airborne wind lidar measurements in the polar North Atlantic region and in the tropics Witschas, Benjamin Lemmerz, Christian Geiß, Alexander Lux, Oliver Marksteiner, Uwe Rahm, Stephan Reitebuch, Oliver Schäfler, Andreas Weiler, Fabian 2022-08-22 application/pdf https://doi.org/10.5194/amt-2022-233 https://amt.copernicus.org/preprints/amt-2022-233/ eng eng doi:10.5194/amt-2022-233 https://amt.copernicus.org/preprints/amt-2022-233/ eISSN: 1867-8548 Text 2022 ftcopernicus https://doi.org/10.5194/amt-2022-233 2022-08-29T16:22:55Z During the first three years of European Space Agency’s Aeolus mission, the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt, DLR) performed four airborne campaigns deploying two different Doppler wind lidars (DWL) on-board the DLR Falcon aircraft, aiming to validate the quality of the recent Aeolus Level 2B (L2B) wind data product (processor baseline 11 and 12). The first two campaigns, WindVal III (Nov/Dec 2018) and AVATAR-E (Aeolus Validation Through Airborne Lidars in Europe, May/Jun 2019) were conducted in Europe and provided first insights in the data quality at the beginning of the mission phase. The two later campaigns, AVATAR-I (Aeolus Validation Through Airborne Lidars in Iceland) and AVATAR-T (Aeolus Validation Through Airborne Lidars in the Tropics), were performed in regions of particular interest for the Aeolus validation: AVATAR-I was conducted from Keflavik, Iceland between 9 September and 1 October 2019 to sample the high wind speeds in the vicinity of the polar jet stream. AVATAR-T was carried out from Sal, Cape Verde between 6 September and 28 September 2021 to measure winds in the Saharan dust-laden African easterly jet. Altogether, 10 Aeolus underflights were performed during AVATAR-I and 11 underflights during AVATAR-T, covering about 8000 km and 11000 km along the Aeolus measurement track, respectively. Based on these collocated measurements, statistical comparisons of Aeolus data with the reference lidar (2-µm DWL) as well as with in-situ measurements by the Falcon were performed to determine the systematic and random error of Rayleigh-clear and Mie-cloudy winds that are contained in the Aeolus L2B product. It is demonstrated that the systematic error almost fulfills the mission requirement of being below 0.7 m s -1 for both Rayleigh-clear and Mie-cloudy winds. The random error is shown to vary between 5.5 m s -1 and 7.1 m s -1 for Rayleigh-clear winds and is thus larger than specified (2.5 m s -1 ), whereas it is close to the specifications for Mie-cloudy winds (2.7 to ... Text Iceland North Atlantic Copernicus Publications: E-Journals Aeolus ENVELOPE(161.267,161.267,-77.483,-77.483) |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
During the first three years of European Space Agency’s Aeolus mission, the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt, DLR) performed four airborne campaigns deploying two different Doppler wind lidars (DWL) on-board the DLR Falcon aircraft, aiming to validate the quality of the recent Aeolus Level 2B (L2B) wind data product (processor baseline 11 and 12). The first two campaigns, WindVal III (Nov/Dec 2018) and AVATAR-E (Aeolus Validation Through Airborne Lidars in Europe, May/Jun 2019) were conducted in Europe and provided first insights in the data quality at the beginning of the mission phase. The two later campaigns, AVATAR-I (Aeolus Validation Through Airborne Lidars in Iceland) and AVATAR-T (Aeolus Validation Through Airborne Lidars in the Tropics), were performed in regions of particular interest for the Aeolus validation: AVATAR-I was conducted from Keflavik, Iceland between 9 September and 1 October 2019 to sample the high wind speeds in the vicinity of the polar jet stream. AVATAR-T was carried out from Sal, Cape Verde between 6 September and 28 September 2021 to measure winds in the Saharan dust-laden African easterly jet. Altogether, 10 Aeolus underflights were performed during AVATAR-I and 11 underflights during AVATAR-T, covering about 8000 km and 11000 km along the Aeolus measurement track, respectively. Based on these collocated measurements, statistical comparisons of Aeolus data with the reference lidar (2-µm DWL) as well as with in-situ measurements by the Falcon were performed to determine the systematic and random error of Rayleigh-clear and Mie-cloudy winds that are contained in the Aeolus L2B product. It is demonstrated that the systematic error almost fulfills the mission requirement of being below 0.7 m s -1 for both Rayleigh-clear and Mie-cloudy winds. The random error is shown to vary between 5.5 m s -1 and 7.1 m s -1 for Rayleigh-clear winds and is thus larger than specified (2.5 m s -1 ), whereas it is close to the specifications for Mie-cloudy winds (2.7 to ... |
format |
Text |
author |
Witschas, Benjamin Lemmerz, Christian Geiß, Alexander Lux, Oliver Marksteiner, Uwe Rahm, Stephan Reitebuch, Oliver Schäfler, Andreas Weiler, Fabian |
spellingShingle |
Witschas, Benjamin Lemmerz, Christian Geiß, Alexander Lux, Oliver Marksteiner, Uwe Rahm, Stephan Reitebuch, Oliver Schäfler, Andreas Weiler, Fabian Validation of the Aeolus L2B wind product with airborne wind lidar measurements in the polar North Atlantic region and in the tropics |
author_facet |
Witschas, Benjamin Lemmerz, Christian Geiß, Alexander Lux, Oliver Marksteiner, Uwe Rahm, Stephan Reitebuch, Oliver Schäfler, Andreas Weiler, Fabian |
author_sort |
Witschas, Benjamin |
title |
Validation of the Aeolus L2B wind product with airborne wind lidar measurements in the polar North Atlantic region and in the tropics |
title_short |
Validation of the Aeolus L2B wind product with airborne wind lidar measurements in the polar North Atlantic region and in the tropics |
title_full |
Validation of the Aeolus L2B wind product with airborne wind lidar measurements in the polar North Atlantic region and in the tropics |
title_fullStr |
Validation of the Aeolus L2B wind product with airborne wind lidar measurements in the polar North Atlantic region and in the tropics |
title_full_unstemmed |
Validation of the Aeolus L2B wind product with airborne wind lidar measurements in the polar North Atlantic region and in the tropics |
title_sort |
validation of the aeolus l2b wind product with airborne wind lidar measurements in the polar north atlantic region and in the tropics |
publishDate |
2022 |
url |
https://doi.org/10.5194/amt-2022-233 https://amt.copernicus.org/preprints/amt-2022-233/ |
long_lat |
ENVELOPE(161.267,161.267,-77.483,-77.483) |
geographic |
Aeolus |
geographic_facet |
Aeolus |
genre |
Iceland North Atlantic |
genre_facet |
Iceland North Atlantic |
op_source |
eISSN: 1867-8548 |
op_relation |
doi:10.5194/amt-2022-233 https://amt.copernicus.org/preprints/amt-2022-233/ |
op_doi |
https://doi.org/10.5194/amt-2022-233 |
_version_ |
1766039758628192256 |