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 degrees S, 11.73 degrees E) and ES-RAD (67.88 degrees N, 21.10 degrees E) in Arctic Sweden - for the period 1 July-31 December 2019. Aeolus is a demonstrator miss...
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Language: | English |
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SMHI, Meteorologi
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:smhi:diva-6155 https://doi.org/10.5194/amt-14-5415-2021 |
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ftsmhi:oai:DiVA.org:smhi-6155 2023-05-15T14:02:03+02:00 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 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:smhi:diva-6155 https://doi.org/10.5194/amt-14-5415-2021 eng eng SMHI, Meteorologi Atmospheric Measurement Techniques, 1867-1381, 2021, 14:8, s. 5415-5428 orcid:0000-0003-3167-3016 orcid:0000-0003-0524-6440 http://urn.kb.se/resolve?urn=urn:nbn:se:smhi:diva-6155 doi:10.5194/amt-14-5415-2021 ISI:000683772700003 info:eu-repo/semantics/openAccess Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning Article in journal info:eu-repo/semantics/article text 2021 ftsmhi https://doi.org/10.5194/amt-14-5415-2021 2022-12-09T10:06:17Z Winds measured by lidar from the Aeolus satellite are compared with winds measured by two ground-based radars - MARA in Antarctica (70.77 degrees S, 11.73 degrees E) and ES-RAD (67.88 degrees N, 21.10 degrees 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 (<1ms(-1)). Possible biases are identified for two subsets (about -2ms(-1) for the Rayleigh winds for the descending passes at MARA and about 2ms(-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 7ms(-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 1ms(-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 Arctic Northern Sweden SMHI (Swedish Meteorological and Hydrological Institute): Vetenskapliga Publikationer (DiVA) Aeolus ENVELOPE(161.267,161.267,-77.483,-77.483) Antarctic Arctic Mara ENVELOPE(132.133,132.133,62.267,62.267) Atmospheric Measurement Techniques 14 8 5415 5428 |
institution |
Open Polar |
collection |
SMHI (Swedish Meteorological and Hydrological Institute): Vetenskapliga Publikationer (DiVA) |
op_collection_id |
ftsmhi |
language |
English |
topic |
Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning |
spellingShingle |
Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning 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 |
Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning |
description |
Winds measured by lidar from the Aeolus satellite are compared with winds measured by two ground-based radars - MARA in Antarctica (70.77 degrees S, 11.73 degrees E) and ES-RAD (67.88 degrees N, 21.10 degrees 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 (<1ms(-1)). Possible biases are identified for two subsets (about -2ms(-1) for the Rayleigh winds for the descending passes at MARA and about 2ms(-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 7ms(-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 1ms(-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 |
SMHI, Meteorologi |
publishDate |
2021 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:smhi:diva-6155 https://doi.org/10.5194/amt-14-5415-2021 |
long_lat |
ENVELOPE(161.267,161.267,-77.483,-77.483) ENVELOPE(132.133,132.133,62.267,62.267) |
geographic |
Aeolus Antarctic Arctic Mara |
geographic_facet |
Aeolus Antarctic Arctic Mara |
genre |
Antarc* Antarctic Antarctica Arctic Northern Sweden |
genre_facet |
Antarc* Antarctic Antarctica Arctic Northern Sweden |
op_relation |
Atmospheric Measurement Techniques, 1867-1381, 2021, 14:8, s. 5415-5428 orcid:0000-0003-3167-3016 orcid:0000-0003-0524-6440 http://urn.kb.se/resolve?urn=urn:nbn:se:smhi:diva-6155 doi:10.5194/amt-14-5415-2021 ISI:000683772700003 |
op_rights |
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 |
_version_ |
1766272111039479808 |