Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/10983
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dc.date.accessioned2018-03-05T13:50:58Zen
dc.date.available2018-03-05T13:50:58Zen
dc.date.issued2017en
dc.identifier.urihttp://hdl.handle.net/2122/10983en
dc.description.abstractA set of four eddy-permitting global ocean reanalyses produced in the framework of the MyOcean project have been compared over the altimetry period 1993–2011. The main differences among the reanalyses used here come from the data assimilation scheme implemented to control the ocean state by inserting reprocessed observations of sea surface temperature (SST), in situ temperature and salinity profiles, sea level anomaly and sea-ice concentration. A first objective of this work includes assessing the interannual variability and trends for a series of parameters, usually considered in the community as essential ocean variables: SST, sea surface salinity, temperature and salinity averaged over meaningful layers of the water column, sea level, transports across pre-defined sections, and sea ice parameters. The eddy-permitting nature of the global reanalyses allows also to estimate eddy kinetic energy. The results show that in general there is a good consistency between the different reanalyses. An intercomparison against experiments without data assimilation was done during the MyOcean project and we conclude that data assimilation is crucial for correctly simulating some quantities such as regional trends of sea level as well as the eddy kinetic energy. A second objective is to show that the ensemble mean of reanalyses can be evaluated as one single system regarding its reliability in reproducing the climate signals, where both variability and uncertainties are assessed through the ensemble spread and signal-to-noise ratio. The main advantage of having access to several reanalyses differing in the way data assimilation is performed is that it becomes possible to assess part of the total uncertainty. Given the fact that we use very similar ocean models and atmospheric forcing, we can conclude that the spread of the ensemble of reanalyses is mainly representative of our ability to gauge uncertainty in the assimilation methods. This uncertainty changes a lot from one ocean parameter to another, especially in global indices. However, despite several caveats in the design of the multi-system ensemble, the main conclusion from this study is that an eddy-permitting multi-system ensemble approach has become mature and our results provide a first step towards a systematic comparison of eddy-permitting global ocean reanalyses aimed at providing robust conclusions on the recent evolution of the oceanic state.en
dc.language.isoEnglishen
dc.relation.ispartofClimate Dynamicsen
dc.relation.ispartofseries/49 (2017)en
dc.subjectOcean reanalyses, data assimilation, ocean modellingen
dc.titleAn ensemble of eddy-permitting global ocean reanalyses from the MyOcean projecten
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumber813–841en
dc.identifier.doi10.1007/s00382-015-2728-5en
dc.description.obiettivoSpecifico4A. Oceanografia e climaen
dc.description.journalTypeJCR Journalen
dc.contributor.authorMasina, Simonaen
dc.contributor.authorStorto, Andreaen
dc.contributor.authorFerry, Nicolasen
dc.contributor.authorValdivieso, Mariaen
dc.contributor.authorHaines, Keithen
dc.contributor.authorBalmaseda, Magdalenaen
dc.contributor.authorZuo, Haoen
dc.contributor.authorDrevillon, Marieen
dc.contributor.authorParent, Laurenten
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italiaen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia-
crisitem.author.deptCNR-Ismar-
crisitem.author.orcid0000-0001-6273-7065-
crisitem.author.orcid0000-0001-5191-9648-
crisitem.author.orcid0000-0003-2768-2374-
crisitem.author.orcid0000-0002-9611-8788-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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