On the assimilation of ice velocity and concentration data into large-scale sea ice models
Data assimilation into sea ice models designed for climate studies has started about 15 years ago. In most of the studies conducted so far, it is assumed that the improvement brought by the assimilation is straightforward. However, some studies suggest this might not be true. In order to elucidate t...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2007
|
Subjects: | |
Online Access: | http://www.ocean-sci.net/3/321/2007/os-3-321-2007.pdf https://doaj.org/article/4bbb1cb92c774077a86254e56e29b703 |
id |
fttriple:oai:gotriple.eu:oai:doaj.org/article:4bbb1cb92c774077a86254e56e29b703 |
---|---|
record_format |
openpolar |
spelling |
fttriple:oai:gotriple.eu:oai:doaj.org/article:4bbb1cb92c774077a86254e56e29b703 2023-05-15T15:09:21+02:00 On the assimilation of ice velocity and concentration data into large-scale sea ice models V. Dulière T. Fichefet 2007-06-01 http://www.ocean-sci.net/3/321/2007/os-3-321-2007.pdf https://doaj.org/article/4bbb1cb92c774077a86254e56e29b703 en eng Copernicus Publications 1812-0784 1812-0792 http://www.ocean-sci.net/3/321/2007/os-3-321-2007.pdf https://doaj.org/article/4bbb1cb92c774077a86254e56e29b703 undefined Ocean Science, Vol 3, Iss 2, Pp 321-335 (2007) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2007 fttriple 2023-01-22T18:19:13Z Data assimilation into sea ice models designed for climate studies has started about 15 years ago. In most of the studies conducted so far, it is assumed that the improvement brought by the assimilation is straightforward. However, some studies suggest this might not be true. In order to elucidate this question and to find an appropriate way to further assimilate sea ice concentration and velocity observations into a global sea ice-ocean model, we analyze here results from a number of twin experiments (i.e. experiments in which the assimilated data are model outputs) carried out with a simplified model of the Arctic sea ice pack. Our objective is to determine to what degree the assimilation of ice velocity and/or concentration data improves the global performance of the model and, more specifically, reduces the error in the computed ice thickness. A simple optimal interpolation scheme is used, and outputs from a control run and from perturbed experiments without and with data assimilation are thoroughly compared. Our results indicate that, under certain conditions depending on the assimilation weights and the type of model error, the assimilation of ice velocity data enhances the model performance. The assimilation of ice concentration data can also help in improving the model behavior, but it has to be handled with care because of the strong connection between ice concentration and ice thickness. This study is first step towards real data assimilation into NEMO-LIM, a global sea ice-ocean model. Article in Journal/Newspaper Arctic ice pack Sea ice Unknown Arctic |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir V. Dulière T. Fichefet On the assimilation of ice velocity and concentration data into large-scale sea ice models |
topic_facet |
geo envir |
description |
Data assimilation into sea ice models designed for climate studies has started about 15 years ago. In most of the studies conducted so far, it is assumed that the improvement brought by the assimilation is straightforward. However, some studies suggest this might not be true. In order to elucidate this question and to find an appropriate way to further assimilate sea ice concentration and velocity observations into a global sea ice-ocean model, we analyze here results from a number of twin experiments (i.e. experiments in which the assimilated data are model outputs) carried out with a simplified model of the Arctic sea ice pack. Our objective is to determine to what degree the assimilation of ice velocity and/or concentration data improves the global performance of the model and, more specifically, reduces the error in the computed ice thickness. A simple optimal interpolation scheme is used, and outputs from a control run and from perturbed experiments without and with data assimilation are thoroughly compared. Our results indicate that, under certain conditions depending on the assimilation weights and the type of model error, the assimilation of ice velocity data enhances the model performance. The assimilation of ice concentration data can also help in improving the model behavior, but it has to be handled with care because of the strong connection between ice concentration and ice thickness. This study is first step towards real data assimilation into NEMO-LIM, a global sea ice-ocean model. |
format |
Article in Journal/Newspaper |
author |
V. Dulière T. Fichefet |
author_facet |
V. Dulière T. Fichefet |
author_sort |
V. Dulière |
title |
On the assimilation of ice velocity and concentration data into large-scale sea ice models |
title_short |
On the assimilation of ice velocity and concentration data into large-scale sea ice models |
title_full |
On the assimilation of ice velocity and concentration data into large-scale sea ice models |
title_fullStr |
On the assimilation of ice velocity and concentration data into large-scale sea ice models |
title_full_unstemmed |
On the assimilation of ice velocity and concentration data into large-scale sea ice models |
title_sort |
on the assimilation of ice velocity and concentration data into large-scale sea ice models |
publisher |
Copernicus Publications |
publishDate |
2007 |
url |
http://www.ocean-sci.net/3/321/2007/os-3-321-2007.pdf https://doaj.org/article/4bbb1cb92c774077a86254e56e29b703 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic ice pack Sea ice |
genre_facet |
Arctic ice pack Sea ice |
op_source |
Ocean Science, Vol 3, Iss 2, Pp 321-335 (2007) |
op_relation |
1812-0784 1812-0792 http://www.ocean-sci.net/3/321/2007/os-3-321-2007.pdf https://doaj.org/article/4bbb1cb92c774077a86254e56e29b703 |
op_rights |
undefined |
_version_ |
1766340568892309504 |