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| Titel |
Inter-comparison and evaluation of sea ice algorithms: towards further identification of challenges and optimal approach using passive microwave observations |
| VerfasserIn |
N. Ivanova, L. T. Pedersen, R. T. Tonboe, S. Kern, G. Heygster, T. Lavergne, A. Sørensen, R. Saldo, G. Dybkjær, L. Brucker, M. Shokr |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 5 ; Nr. 9, no. 5 (2015-09-15), S.1797-1817 |
| Datensatznummer |
250116849
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| Publikation (Nr.) |
 copernicus.org/tc-9-1797-2015.pdf |
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| Zusammenfassung |
| 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. |
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