Towards Retrieving Reliable Ocean Surface Currents in the Coastal Zone From the Sentinel-1 Doppler Shift Observations
Recent developments on calibration and partitioning of the signal between the wave and current contributions significantly improve the accuracy of geophysical retrievals from Sentinel-1 Synthetic Aperture Radar-based Doppler shift measurements in the open ocean. In this study, we revise the Sentinel...
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Online Access: | https://hdl.handle.net/11250/3058088 https://doi.org/10.1029/2021JC018201 |
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ftunivbergen:oai:bora.uib.no:11250/3058088 2023-05-15T17:43:38+02:00 Towards Retrieving Reliable Ocean Surface Currents in the Coastal Zone From the Sentinel-1 Doppler Shift Observations Moiseev, Artem Johannessen, Johnny Andre Johnsen, Harald 2022 application/pdf https://hdl.handle.net/11250/3058088 https://doi.org/10.1029/2021JC018201 eng eng American Geophysical Union ESA - den europeiske romfartsorganisasjonen: Sentinel 1 RVL Assessment Project Norges forskningsråd: CIRFA 970422528 Norges forskningsråd: NERSC—251348/F50 urn:issn:2169-9275 https://hdl.handle.net/11250/3058088 https://doi.org/10.1029/2021JC018201 cristin:2046586 Journal of Geophysical Research: Oceans. 2022, 127 (5), e2021JC018201. Copyright 2022 American Geophysical Union. All Rights Reserved. e2021JC018201 Journal of Geophysical Research: Oceans 127 5 Journal article Peer reviewed 2022 ftunivbergen https://doi.org/10.1029/2021JC018201 2023-03-16T00:05:09Z Recent developments on calibration and partitioning of the signal between the wave and current contributions significantly improve the accuracy of geophysical retrievals from Sentinel-1 Synthetic Aperture Radar-based Doppler shift measurements in the open ocean. In this study, we revise the Sentinel-1B Interferometric Wide products acquired from December 2017 to January 2018 along the coastal zone of northern Norway. We find that the satellite attitude is responsible for 30% of the variation in the Doppler shift observations, while the antenna pattern can describe an additional 15%. The residual variation after recalibration is about 3.8 Hz, corresponding to 0.21–0.15 m/s radial velocity (RVL) depending on the incidence angle. Using recalibrated Sentinel-1 observations, collocated with near-surface wind from MetCoOp-Ensemble Prediction System and sea state from MyWaveWAM, we develop an empirical function (CDOP3SiX) for estimating the sea-state-induced Doppler shift. CDOP3SiX improves the accuracy of sea state contribution estimates under mixed wind fetch conditions and demonstrates that the Norwegian Coastal Current can be detected in the Sentinel-1 derived ocean surface current RVL maps. Moreover, two anticyclonic mesoscale eddies with radial velocities of about 0.5 m/s are detected. The surface current patterns are consistent with the collocated sea surface temperature observations. The Doppler shift observations from Sentinel-1 can therefore be used to study ocean surface currents in the coastal zone with a 1.5 km spatial resolution. Key Points The Sentinel-1 Doppler shift observations are used to retrieve information about the ocean surface currents in the coastal zone Mesoscale eddies are detected in the Synthetic Aperture Radar-derived ocean surface current radial velocity fields Combination of the wind and wave information from collocated models improves the accuracy of the wave-induced contribution estimates Plain Language Summary Knowledge of ocean surface currents is crucial for studies of volume, heat ... Article in Journal/Newspaper Northern Norway University of Bergen: Bergen Open Research Archive (BORA-UiB) Norway The Sentinel ENVELOPE(73.317,73.317,-52.983,-52.983) Journal of Geophysical Research: Oceans 127 5 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
Recent developments on calibration and partitioning of the signal between the wave and current contributions significantly improve the accuracy of geophysical retrievals from Sentinel-1 Synthetic Aperture Radar-based Doppler shift measurements in the open ocean. In this study, we revise the Sentinel-1B Interferometric Wide products acquired from December 2017 to January 2018 along the coastal zone of northern Norway. We find that the satellite attitude is responsible for 30% of the variation in the Doppler shift observations, while the antenna pattern can describe an additional 15%. The residual variation after recalibration is about 3.8 Hz, corresponding to 0.21–0.15 m/s radial velocity (RVL) depending on the incidence angle. Using recalibrated Sentinel-1 observations, collocated with near-surface wind from MetCoOp-Ensemble Prediction System and sea state from MyWaveWAM, we develop an empirical function (CDOP3SiX) for estimating the sea-state-induced Doppler shift. CDOP3SiX improves the accuracy of sea state contribution estimates under mixed wind fetch conditions and demonstrates that the Norwegian Coastal Current can be detected in the Sentinel-1 derived ocean surface current RVL maps. Moreover, two anticyclonic mesoscale eddies with radial velocities of about 0.5 m/s are detected. The surface current patterns are consistent with the collocated sea surface temperature observations. The Doppler shift observations from Sentinel-1 can therefore be used to study ocean surface currents in the coastal zone with a 1.5 km spatial resolution. Key Points The Sentinel-1 Doppler shift observations are used to retrieve information about the ocean surface currents in the coastal zone Mesoscale eddies are detected in the Synthetic Aperture Radar-derived ocean surface current radial velocity fields Combination of the wind and wave information from collocated models improves the accuracy of the wave-induced contribution estimates Plain Language Summary Knowledge of ocean surface currents is crucial for studies of volume, heat ... |
format |
Article in Journal/Newspaper |
author |
Moiseev, Artem Johannessen, Johnny Andre Johnsen, Harald |
spellingShingle |
Moiseev, Artem Johannessen, Johnny Andre Johnsen, Harald Towards Retrieving Reliable Ocean Surface Currents in the Coastal Zone From the Sentinel-1 Doppler Shift Observations |
author_facet |
Moiseev, Artem Johannessen, Johnny Andre Johnsen, Harald |
author_sort |
Moiseev, Artem |
title |
Towards Retrieving Reliable Ocean Surface Currents in the Coastal Zone From the Sentinel-1 Doppler Shift Observations |
title_short |
Towards Retrieving Reliable Ocean Surface Currents in the Coastal Zone From the Sentinel-1 Doppler Shift Observations |
title_full |
Towards Retrieving Reliable Ocean Surface Currents in the Coastal Zone From the Sentinel-1 Doppler Shift Observations |
title_fullStr |
Towards Retrieving Reliable Ocean Surface Currents in the Coastal Zone From the Sentinel-1 Doppler Shift Observations |
title_full_unstemmed |
Towards Retrieving Reliable Ocean Surface Currents in the Coastal Zone From the Sentinel-1 Doppler Shift Observations |
title_sort |
towards retrieving reliable ocean surface currents in the coastal zone from the sentinel-1 doppler shift observations |
publisher |
American Geophysical Union |
publishDate |
2022 |
url |
https://hdl.handle.net/11250/3058088 https://doi.org/10.1029/2021JC018201 |
long_lat |
ENVELOPE(73.317,73.317,-52.983,-52.983) |
geographic |
Norway The Sentinel |
geographic_facet |
Norway The Sentinel |
genre |
Northern Norway |
genre_facet |
Northern Norway |
op_source |
e2021JC018201 Journal of Geophysical Research: Oceans 127 5 |
op_relation |
ESA - den europeiske romfartsorganisasjonen: Sentinel 1 RVL Assessment Project Norges forskningsråd: CIRFA 970422528 Norges forskningsråd: NERSC—251348/F50 urn:issn:2169-9275 https://hdl.handle.net/11250/3058088 https://doi.org/10.1029/2021JC018201 cristin:2046586 Journal of Geophysical Research: Oceans. 2022, 127 (5), e2021JC018201. |
op_rights |
Copyright 2022 American Geophysical Union. All Rights Reserved. |
op_doi |
https://doi.org/10.1029/2021JC018201 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
127 |
container_issue |
5 |
_version_ |
1766145755151597568 |