Validation of Aeolus winds using ground-based radars in Antarctica and in northern Sweden
Winds measured by lidar from the Aeolus satellite are compared with winds measured by two ground-based radars – MARA in Antarctica (70.77∘ S, 11.73∘ E) and ESRAD (67.88∘ N, 21.10∘ E) in Arctic Sweden – for the period 1 July–31 December 2019. Aeolus is a demonstrator mission to test whether winds mea...
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Copernicus Publications
2021
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Online Access: | https://doi.org/10.5194/amt-14-5415-2021 https://noa.gwlb.de/receive/cop_mods_00057674 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00057324/amt-14-5415-2021.pdf https://amt.copernicus.org/articles/14/5415/2021/amt-14-5415-2021.pdf |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00057674 2024-09-15T17:47:37+00:00 Validation of Aeolus winds using ground-based radars in Antarctica and in northern Sweden Belova, Evgenia Kirkwood, Sheila Voelger, Peter Chatterjee, Sourav Satheesan, Karathazhiyath Hagelin, Susanna Lindskog, Magnus Körnich, Heiner 2021-08 electronic https://doi.org/10.5194/amt-14-5415-2021 https://noa.gwlb.de/receive/cop_mods_00057674 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00057324/amt-14-5415-2021.pdf https://amt.copernicus.org/articles/14/5415/2021/amt-14-5415-2021.pdf eng eng Copernicus Publications Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-14-5415-2021 https://noa.gwlb.de/receive/cop_mods_00057674 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00057324/amt-14-5415-2021.pdf https://amt.copernicus.org/articles/14/5415/2021/amt-14-5415-2021.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2021 ftnonlinearchiv https://doi.org/10.5194/amt-14-5415-2021 2024-06-26T04:38:21Z Winds measured by lidar from the Aeolus satellite are compared with winds measured by two ground-based radars – MARA in Antarctica (70.77∘ S, 11.73∘ E) and ESRAD (67.88∘ N, 21.10∘ E) in Arctic Sweden – for the period 1 July–31 December 2019. Aeolus is a demonstrator mission to test whether winds measured by Doppler lidar from space can have sufficient accuracy to contribute to improved weather forecasting. A comprehensive programme of calibration and validation has been undertaken following the satellite launch in 2018, but, so far, direct comparison with independent measurements from the Arctic or Antarctic regions have not been made. The comparison covers heights from the low troposphere to just above the tropopause. Results for each radar site are presented separately for Rayleigh (clear) winds, Mie (cloudy) winds, sunlit (“summer”) and non-sunlit (“winter”) seasons, and ascending and descending satellite tracks. Horizontally projected line-of-sight (HLOS) winds from Aeolus, reprocessed using baseline 2B10, for passes within 100 km of the radar sites, are compared with HLOS winds calculated from 1 h averaged radar horizontal wind components. The agreement in most data subsets is very good, with no evidence of significant biases (<1 m s−1). Possible biases are identified for two subsets (about −2 m s−1 for the Rayleigh winds for the descending passes at MARA and about 2 m s−1 for the Mie winds for the ascending passes at ESRAD, both in winter), but these are only marginally significant. A robust significant bias of about 7 m s−1 is found for the Mie winds for the ascending tracks at MARA in summer. There is also some evidence for increased random error (by about 1 m s−1) for the Aeolus Mie winds at MARA in summer compared to winter. This might be related to the presence of sunlight scatter over the whole of Antarctica as Aeolus transits across it during summer. Article in Journal/Newspaper Antarc* Antarctic Antarctica Northern Sweden Niedersächsisches Online-Archiv NOA Atmospheric Measurement Techniques 14 8 5415 5428 |
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topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Belova, Evgenia Kirkwood, Sheila Voelger, Peter Chatterjee, Sourav Satheesan, Karathazhiyath Hagelin, Susanna Lindskog, Magnus Körnich, Heiner Validation of Aeolus winds using ground-based radars in Antarctica and in northern Sweden |
topic_facet |
article Verlagsveröffentlichung |
description |
Winds measured by lidar from the Aeolus satellite are compared with winds measured by two ground-based radars – MARA in Antarctica (70.77∘ S, 11.73∘ E) and ESRAD (67.88∘ N, 21.10∘ E) in Arctic Sweden – for the period 1 July–31 December 2019. Aeolus is a demonstrator mission to test whether winds measured by Doppler lidar from space can have sufficient accuracy to contribute to improved weather forecasting. A comprehensive programme of calibration and validation has been undertaken following the satellite launch in 2018, but, so far, direct comparison with independent measurements from the Arctic or Antarctic regions have not been made. The comparison covers heights from the low troposphere to just above the tropopause. Results for each radar site are presented separately for Rayleigh (clear) winds, Mie (cloudy) winds, sunlit (“summer”) and non-sunlit (“winter”) seasons, and ascending and descending satellite tracks. Horizontally projected line-of-sight (HLOS) winds from Aeolus, reprocessed using baseline 2B10, for passes within 100 km of the radar sites, are compared with HLOS winds calculated from 1 h averaged radar horizontal wind components. The agreement in most data subsets is very good, with no evidence of significant biases (<1 m s−1). Possible biases are identified for two subsets (about −2 m s−1 for the Rayleigh winds for the descending passes at MARA and about 2 m s−1 for the Mie winds for the ascending passes at ESRAD, both in winter), but these are only marginally significant. A robust significant bias of about 7 m s−1 is found for the Mie winds for the ascending tracks at MARA in summer. There is also some evidence for increased random error (by about 1 m s−1) for the Aeolus Mie winds at MARA in summer compared to winter. This might be related to the presence of sunlight scatter over the whole of Antarctica as Aeolus transits across it during summer. |
format |
Article in Journal/Newspaper |
author |
Belova, Evgenia Kirkwood, Sheila Voelger, Peter Chatterjee, Sourav Satheesan, Karathazhiyath Hagelin, Susanna Lindskog, Magnus Körnich, Heiner |
author_facet |
Belova, Evgenia Kirkwood, Sheila Voelger, Peter Chatterjee, Sourav Satheesan, Karathazhiyath Hagelin, Susanna Lindskog, Magnus Körnich, Heiner |
author_sort |
Belova, Evgenia |
title |
Validation of Aeolus winds using ground-based radars in Antarctica and in northern Sweden |
title_short |
Validation of Aeolus winds using ground-based radars in Antarctica and in northern Sweden |
title_full |
Validation of Aeolus winds using ground-based radars in Antarctica and in northern Sweden |
title_fullStr |
Validation of Aeolus winds using ground-based radars in Antarctica and in northern Sweden |
title_full_unstemmed |
Validation of Aeolus winds using ground-based radars in Antarctica and in northern Sweden |
title_sort |
validation of aeolus winds using ground-based radars in antarctica and in northern sweden |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/amt-14-5415-2021 https://noa.gwlb.de/receive/cop_mods_00057674 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00057324/amt-14-5415-2021.pdf https://amt.copernicus.org/articles/14/5415/2021/amt-14-5415-2021.pdf |
genre |
Antarc* Antarctic Antarctica Northern Sweden |
genre_facet |
Antarc* Antarctic Antarctica Northern Sweden |
op_relation |
Atmospheric Measurement Techniques -- http://www.bibliothek.uni-regensburg.de/ezeit/?2505596 -- http://www.atmospheric-measurement-techniques.net/ -- 1867-8548 https://doi.org/10.5194/amt-14-5415-2021 https://noa.gwlb.de/receive/cop_mods_00057674 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00057324/amt-14-5415-2021.pdf https://amt.copernicus.org/articles/14/5415/2021/amt-14-5415-2021.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/amt-14-5415-2021 |
container_title |
Atmospheric Measurement Techniques |
container_volume |
14 |
container_issue |
8 |
container_start_page |
5415 |
op_container_end_page |
5428 |
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1810497077556281344 |