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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Copernicus Publications
2015
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fttriple:oai:gotriple.eu:oai:doaj.org/article:20ecc2b7e90e477fab22370f980544e1 2023-05-15T17:43:26+02:00 Constraining energetic slope currents through assimilation of high-frequency radar observations A. K. Sperrevik K. H. Christensen J. Röhrs 2015-03-01 https://doi.org/10.5194/os-11-237-2015 http://www.ocean-sci.net/11/237/2015/os-11-237-2015.pdf https://doaj.org/article/20ecc2b7e90e477fab22370f980544e1 en eng Copernicus Publications 1812-0784 1812-0792 doi:10.5194/os-11-237-2015 http://www.ocean-sci.net/11/237/2015/os-11-237-2015.pdf https://doaj.org/article/20ecc2b7e90e477fab22370f980544e1 undefined Ocean Science, Vol 11, Iss 2, Pp 237-249 (2015) info geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2015 fttriple https://doi.org/10.5194/os-11-237-2015 2023-01-22T19:11:24Z 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 Unknown Norway Vesterålen ENVELOPE(14.939,14.939,68.754,68.754) Ocean Science 11 2 237 249 |
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English |
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info geo A. K. Sperrevik K. H. Christensen J. Röhrs Constraining energetic slope currents through assimilation of high-frequency radar observations |
topic_facet |
info geo |
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 |
A. K. Sperrevik K. H. Christensen J. Röhrs |
author_facet |
A. K. Sperrevik K. H. Christensen J. Röhrs |
author_sort |
A. K. Sperrevik |
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 http://www.ocean-sci.net/11/237/2015/os-11-237-2015.pdf https://doaj.org/article/20ecc2b7e90e477fab22370f980544e1 |
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_source |
Ocean Science, Vol 11, Iss 2, Pp 237-249 (2015) |
op_relation |
1812-0784 1812-0792 doi:10.5194/os-11-237-2015 http://www.ocean-sci.net/11/237/2015/os-11-237-2015.pdf https://doaj.org/article/20ecc2b7e90e477fab22370f980544e1 |
op_rights |
undefined |
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_ |
1766145500590899200 |