Constraining energetic slope currents through assimilation of high-frequency radar observations
Assimilation of high-frequency (HF) radar current observations and CTD hydrography is performed with the 4D-Var analysis scheme implemented in the Regional Ocean Modeling System (ROMS). We consider both an idealized case, with a baroclinic slope current in a periodic channel, and a realistic case fo...
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2015
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Online Access: | https://doi.org/10.5194/os-11-237-2015 https://noa.gwlb.de/receive/cop_mods_00017200 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00017155/os-11-237-2015.pdf https://os.copernicus.org/articles/11/237/2015/os-11-237-2015.pdf |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00017200 2023-05-15T17:43:26+02:00 Constraining energetic slope currents through assimilation of high-frequency radar observations Sperrevik, A. K. Christensen, K. H. Röhrs, J. 2015-03 electronic https://doi.org/10.5194/os-11-237-2015 https://noa.gwlb.de/receive/cop_mods_00017200 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00017155/os-11-237-2015.pdf https://os.copernicus.org/articles/11/237/2015/os-11-237-2015.pdf eng eng Copernicus Publications Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-11-237-2015 https://noa.gwlb.de/receive/cop_mods_00017200 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00017155/os-11-237-2015.pdf https://os.copernicus.org/articles/11/237/2015/os-11-237-2015.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2015 ftnonlinearchiv https://doi.org/10.5194/os-11-237-2015 2022-02-08T22:53:47Z Assimilation of high-frequency (HF) radar current observations and CTD hydrography is performed with the 4D-Var analysis scheme implemented in the Regional Ocean Modeling System (ROMS). We consider both an idealized case, with a baroclinic slope current in a periodic channel, and a realistic case for the coast of Vesterålen in northern Norway. In the realistic case, the results of the data assimilation are compared with independent data from acoustic profilers and surface drifters. Best results are obtained when background error correlation scales are small (10 km or less) and when the data assimilation window is short, i.e. about 1 day. Furthermore, we find that the impact of assimilating HF radar currents is generally larger than the impact of CTD hydrography. However, combining the HF radar currents with a few hydrographic profiles gives significantly better results, which demonstrates the importance of complementing surface observations with observations of the vertical structure of the ocean. Article in Journal/Newspaper Northern Norway Vesterålen Niedersächsisches Online-Archiv NOA Norway Vesterålen ENVELOPE(14.939,14.939,68.754,68.754) Ocean Science 11 2 237 249 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Sperrevik, A. K. Christensen, K. H. Röhrs, J. Constraining energetic slope currents through assimilation of high-frequency radar observations |
topic_facet |
article Verlagsveröffentlichung |
description |
Assimilation of high-frequency (HF) radar current observations and CTD hydrography is performed with the 4D-Var analysis scheme implemented in the Regional Ocean Modeling System (ROMS). We consider both an idealized case, with a baroclinic slope current in a periodic channel, and a realistic case for the coast of Vesterålen in northern Norway. In the realistic case, the results of the data assimilation are compared with independent data from acoustic profilers and surface drifters. Best results are obtained when background error correlation scales are small (10 km or less) and when the data assimilation window is short, i.e. about 1 day. Furthermore, we find that the impact of assimilating HF radar currents is generally larger than the impact of CTD hydrography. However, combining the HF radar currents with a few hydrographic profiles gives significantly better results, which demonstrates the importance of complementing surface observations with observations of the vertical structure of the ocean. |
format |
Article in Journal/Newspaper |
author |
Sperrevik, A. K. Christensen, K. H. Röhrs, J. |
author_facet |
Sperrevik, A. K. Christensen, K. H. Röhrs, J. |
author_sort |
Sperrevik, A. K. |
title |
Constraining energetic slope currents through assimilation of high-frequency radar observations |
title_short |
Constraining energetic slope currents through assimilation of high-frequency radar observations |
title_full |
Constraining energetic slope currents through assimilation of high-frequency radar observations |
title_fullStr |
Constraining energetic slope currents through assimilation of high-frequency radar observations |
title_full_unstemmed |
Constraining energetic slope currents through assimilation of high-frequency radar observations |
title_sort |
constraining energetic slope currents through assimilation of high-frequency radar observations |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/os-11-237-2015 https://noa.gwlb.de/receive/cop_mods_00017200 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00017155/os-11-237-2015.pdf https://os.copernicus.org/articles/11/237/2015/os-11-237-2015.pdf |
long_lat |
ENVELOPE(14.939,14.939,68.754,68.754) |
geographic |
Norway Vesterålen |
geographic_facet |
Norway Vesterålen |
genre |
Northern Norway Vesterålen |
genre_facet |
Northern Norway Vesterålen |
op_relation |
Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-11-237-2015 https://noa.gwlb.de/receive/cop_mods_00017200 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00017155/os-11-237-2015.pdf https://os.copernicus.org/articles/11/237/2015/os-11-237-2015.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/os-11-237-2015 |
container_title |
Ocean Science |
container_volume |
11 |
container_issue |
2 |
container_start_page |
237 |
op_container_end_page |
249 |
_version_ |
1766145494902374400 |