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dc.contributor.authorDurán Moro, Marina
dc.contributor.authorSperrevik, Ann Kristin
dc.contributor.authorLavergne, Thomas
dc.contributor.authorBertino, Laurent
dc.contributor.authorGusdal, Yvonne
dc.contributor.authorIversen, Silje Christine
dc.contributor.authorRusin, Jozef
dc.date.accessioned2024-09-17T07:35:54Z
dc.date.available2024-09-17T07:35:54Z
dc.date.issued2024-04-08
dc.description.abstractOperational forecasting systems routinely assimilate daily means of sea ice concentration (SIC) from microwave radiometers in order to improve the accuracy of the forecasts. However, the temporal and spatial averaging of the individual satellite swaths into daily means of SIC entails two main drawbacks: (i) the spatial resolution of the original product is blurred (especially critical in periods with strong sub-daily sea ice movement), and (ii) the sub-daily frequency of passive microwave observations in the Arctic are not used, providing less temporal resolution in the data assimilation (DA) analysis and, therefore, in the forecast. Within the SIRANO (Sea Ice Retrievals and data Assimilation in NOrway) project, we investigate how challenges (i) and (ii) can be avoided by assimilating individual satellite swaths (level 3 uncollated) instead of daily means (level 3) of SIC. To do so, we use a regional configuration of the Barents Sea (2.5 km grid) based on the Regional Ocean Modeling System (ROMS) and the Los Alamos Sea Ice Model (CICE) together with the ensemble Kalman filter (EnKF) as the DA system. The assimilation of individual swaths significantly improves the EnKF analysis of SIC compared to the assimilation of daily means; the mean absolute difference (MAD) shows a 10 % improvement at the end of the assimilation period and a 7 % improvement at the end of the 7 d forecast period. This improvement is caused by better exploitation of the information provided by the SIC swath data, in terms of both spatial and temporal variance, compared to the case when the swaths are combined to form a daily mean before assimilation.en_US
dc.identifier.citationDurán Moro, Sperrevik, Lavergne, Bertino, Gusdal, Iversen, Rusin. Assimilation of satellite swaths versus daily means of sea ice concentration in a regional coupled ocean–sea ice model. The Cryosphere. 2024;18(4):1597-1619en_US
dc.identifier.cristinIDFRIDAID 2261146
dc.identifier.doi10.5194/tc-18-1597-2024
dc.identifier.issn1994-0416
dc.identifier.issn1994-0424
dc.identifier.urihttps://hdl.handle.net/10037/34741
dc.language.isoengen_US
dc.publisherCopernicus Publicationsen_US
dc.relation.journalThe Cryosphere
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2024 The Author(s)en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.rightsAttribution 4.0 International (CC BY 4.0)en_US
dc.titleAssimilation of satellite swaths versus daily means of sea ice concentration in a regional coupled ocean–sea ice modelen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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Attribution 4.0 International (CC BY 4.0)
Except where otherwise noted, this item's license is described as Attribution 4.0 International (CC BY 4.0)