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...
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2021
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ftdoajarticles:oai:doaj.org/article:7c3b6381beba400d85db29ccecbcb54a 2023-05-15T13:34:50+02:00 Validation of Aeolus winds using ground-based radars in Antarctica and in northern Sweden E. Belova S. Kirkwood P. Voelger S. Chatterjee K. Satheesan S. Hagelin M. Lindskog H. Körnich 2021-08-01T00:00:00Z https://doi.org/10.5194/amt-14-5415-2021 https://doaj.org/article/7c3b6381beba400d85db29ccecbcb54a EN eng Copernicus Publications https://amt.copernicus.org/articles/14/5415/2021/amt-14-5415-2021.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-14-5415-2021 1867-1381 1867-8548 https://doaj.org/article/7c3b6381beba400d85db29ccecbcb54a Atmospheric Measurement Techniques, Vol 14, Pp 5415-5428 (2021) Environmental engineering TA170-171 Earthwork. Foundations TA715-787 article 2021 ftdoajarticles https://doi.org/10.5194/amt-14-5415-2021 2022-12-31T04:29:37Z 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 Arctic Northern Sweden Directory of Open Access Journals: DOAJ Articles 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 |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
spellingShingle |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 E. Belova S. Kirkwood P. Voelger S. Chatterjee K. Satheesan S. Hagelin M. Lindskog H. Körnich Validation of Aeolus winds using ground-based radars in Antarctica and in northern Sweden |
topic_facet |
Environmental engineering TA170-171 Earthwork. Foundations TA715-787 |
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 |
E. Belova S. Kirkwood P. Voelger S. Chatterjee K. Satheesan S. Hagelin M. Lindskog H. Körnich |
author_facet |
E. Belova S. Kirkwood P. Voelger S. Chatterjee K. Satheesan S. Hagelin M. Lindskog H. Körnich |
author_sort |
E. Belova |
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://doaj.org/article/7c3b6381beba400d85db29ccecbcb54a |
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_source |
Atmospheric Measurement Techniques, Vol 14, Pp 5415-5428 (2021) |
op_relation |
https://amt.copernicus.org/articles/14/5415/2021/amt-14-5415-2021.pdf https://doaj.org/toc/1867-1381 https://doaj.org/toc/1867-8548 doi:10.5194/amt-14-5415-2021 1867-1381 1867-8548 https://doaj.org/article/7c3b6381beba400d85db29ccecbcb54a |
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_ |
1766058348149473280 |