Inter-comparison and evaluation of sea ice algorithms: towards further identification of challenges and optimal approach using passive microwave observations
Sea ice concentration has been retrieved in polar regions with satellite microwave radiometers for over 30 years. However, the question remains as to what is an optimal sea ice concentration retrieval method for climate monitoring. This paper presents some of the key results of an extensive algorith...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:712504a3170045cc92c1a558c8988c12 2023-05-15T18:16:25+02:00 Inter-comparison and evaluation of sea ice algorithms: towards further identification of challenges and optimal approach using passive microwave observations N. Ivanova L. T. Pedersen R. T. Tonboe S. Kern G. Heygster T. Lavergne A. Sørensen R. Saldo G. Dybkjær L. Brucker M. Shokr 2015-09-01 https://doi.org/10.5194/tc-9-1797-2015 http://www.the-cryosphere.net/9/1797/2015/tc-9-1797-2015.pdf https://doaj.org/article/712504a3170045cc92c1a558c8988c12 en eng Copernicus Publications 1994-0416 1994-0424 doi:10.5194/tc-9-1797-2015 http://www.the-cryosphere.net/9/1797/2015/tc-9-1797-2015.pdf https://doaj.org/article/712504a3170045cc92c1a558c8988c12 undefined The Cryosphere, Vol 9, Iss 5, Pp 1797-1817 (2015) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2015 fttriple https://doi.org/10.5194/tc-9-1797-2015 2023-01-22T19:19:14Z Sea ice concentration has been retrieved in polar regions with satellite microwave radiometers for over 30 years. However, the question remains as to what is an optimal sea ice concentration retrieval method for climate monitoring. This paper presents some of the key results of an extensive algorithm inter-comparison and evaluation experiment. The skills of 30 sea ice algorithms were evaluated systematically over low and high sea ice concentrations. Evaluation criteria included standard deviation relative to independent validation data, performance in the presence of thin ice and melt ponds, and sensitivity to error sources with seasonal to inter-annual variations and potential climatic trends, such as atmospheric water vapour and water-surface roughening by wind. A selection of 13 algorithms is shown in the article to demonstrate the results. Based on the findings, a hybrid approach is suggested to retrieve sea ice concentration globally for climate monitoring purposes. This approach consists of a combination of two algorithms plus dynamic tie points implementation and atmospheric correction of input brightness temperatures. The method minimizes inter-sensor calibration discrepancies and sensitivity to the mentioned error sources. Article in Journal/Newspaper Sea ice The Cryosphere Unknown The Cryosphere 9 5 1797 1817 |
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geo envir N. Ivanova L. T. Pedersen R. T. Tonboe S. Kern G. Heygster T. Lavergne A. Sørensen R. Saldo G. Dybkjær L. Brucker M. Shokr Inter-comparison and evaluation of sea ice algorithms: towards further identification of challenges and optimal approach using passive microwave observations |
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geo envir |
description |
Sea ice concentration has been retrieved in polar regions with satellite microwave radiometers for over 30 years. However, the question remains as to what is an optimal sea ice concentration retrieval method for climate monitoring. This paper presents some of the key results of an extensive algorithm inter-comparison and evaluation experiment. The skills of 30 sea ice algorithms were evaluated systematically over low and high sea ice concentrations. Evaluation criteria included standard deviation relative to independent validation data, performance in the presence of thin ice and melt ponds, and sensitivity to error sources with seasonal to inter-annual variations and potential climatic trends, such as atmospheric water vapour and water-surface roughening by wind. A selection of 13 algorithms is shown in the article to demonstrate the results. Based on the findings, a hybrid approach is suggested to retrieve sea ice concentration globally for climate monitoring purposes. This approach consists of a combination of two algorithms plus dynamic tie points implementation and atmospheric correction of input brightness temperatures. The method minimizes inter-sensor calibration discrepancies and sensitivity to the mentioned error sources. |
format |
Article in Journal/Newspaper |
author |
N. Ivanova L. T. Pedersen R. T. Tonboe S. Kern G. Heygster T. Lavergne A. Sørensen R. Saldo G. Dybkjær L. Brucker M. Shokr |
author_facet |
N. Ivanova L. T. Pedersen R. T. Tonboe S. Kern G. Heygster T. Lavergne A. Sørensen R. Saldo G. Dybkjær L. Brucker M. Shokr |
author_sort |
N. Ivanova |
title |
Inter-comparison and evaluation of sea ice algorithms: towards further identification of challenges and optimal approach using passive microwave observations |
title_short |
Inter-comparison and evaluation of sea ice algorithms: towards further identification of challenges and optimal approach using passive microwave observations |
title_full |
Inter-comparison and evaluation of sea ice algorithms: towards further identification of challenges and optimal approach using passive microwave observations |
title_fullStr |
Inter-comparison and evaluation of sea ice algorithms: towards further identification of challenges and optimal approach using passive microwave observations |
title_full_unstemmed |
Inter-comparison and evaluation of sea ice algorithms: towards further identification of challenges and optimal approach using passive microwave observations |
title_sort |
inter-comparison and evaluation of sea ice algorithms: towards further identification of challenges and optimal approach using passive microwave observations |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/tc-9-1797-2015 http://www.the-cryosphere.net/9/1797/2015/tc-9-1797-2015.pdf https://doaj.org/article/712504a3170045cc92c1a558c8988c12 |
genre |
Sea ice The Cryosphere |
genre_facet |
Sea ice The Cryosphere |
op_source |
The Cryosphere, Vol 9, Iss 5, Pp 1797-1817 (2015) |
op_relation |
1994-0416 1994-0424 doi:10.5194/tc-9-1797-2015 http://www.the-cryosphere.net/9/1797/2015/tc-9-1797-2015.pdf https://doaj.org/article/712504a3170045cc92c1a558c8988c12 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-9-1797-2015 |
container_title |
The Cryosphere |
container_volume |
9 |
container_issue |
5 |
container_start_page |
1797 |
op_container_end_page |
1817 |
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1766190004015464448 |