Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/7588
DC Field | Value | Language |
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dc.contributor.authorall | Storto, A.; Centro Euro-Mediterraneo per i Cambiamenti Climatici, Bologna, Italy | en |
dc.contributor.authorall | Dobricic, S.; Centro Euro-Mediterraneo per i Cambiamenti Climatici, Bologna, Italy | en |
dc.contributor.authorall | Masina, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia | en |
dc.contributor.authorall | Di Pietro, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia | en |
dc.date.accessioned | 2012-01-27T07:52:51Z | en |
dc.date.available | 2012-01-27T07:52:51Z | en |
dc.date.issued | 2011-03 | en |
dc.identifier.uri | http://hdl.handle.net/2122/7588 | en |
dc.description.abstract | A global ocean three-dimensional variational data assimilation system was developed with the aim of assimilating along-track sea level anomaly observations, along with in situ observations from bathythermographs and conventional sea stations. All the available altimetric data within the period October 1992–January 2006 were used in this study. The sea level corrections were covariated with vertical profiles of temperature and salinity according to the bivariate definition of the background-error vertical covariances. Sea level anomaly observational error variance was carefully defined as a sum of instrumental, representativeness, observation operator, and mean dynamic topography error variances. The mean dynamic topography was computed from the model long-term mean sea surface height and adjusted through an optimal interpolation scheme to account for observation minus first-guess biases. Results show that the assimilation of sea level anomaly observations improves the model sea surface height skill scores as well as the subsurface temperature and salinity fields. Furthermore, the estimate of the tropical and subtropical surface circulation is clearly improved after assimilating altimetric data. Nonnegligible impacts of the mean dynamic topography used have also been found: compared to a gravimeter-based mean dynamic topography the use of the mean dynamic topography discussed in this paper improves both the consistency with sea level anomaly observations and the verification skill scores of temperature and salinity in the tropical regions. Furthermore, the use of a mean dynamic topography computed from the model long-term sea surface height mean without observation adjustments results in worsened verification skill scores and highlights the benefits of the current approach for deriving the mean dynamic topography. | en |
dc.description.sponsorship | European Commission WP4 Fondazione Cassa di Risparmio di Bologna Cnes | en |
dc.language.iso | English | en |
dc.publisher.name | American Meteorological Society | en |
dc.relation.ispartof | Monthly Weather Review | en |
dc.relation.ispartofseries | 3/139 (2011) | en |
dc.subject | Data assimilation | en |
dc.subject | Satellite observations | en |
dc.subject | Ocean models | en |
dc.subject | Sea level | en |
dc.subject | In situ observations | en |
dc.subject | Variational analysis | en |
dc.title | Assimilating Along-Track Altimetric Observations through Local Hydrostatic Adjustment in a Global Ocean Variational Assimilation System | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 738-754 | en |
dc.identifier.URL | http://journals.ametsoc.org/doi/pdf/10.1175/2010MWR3350.1 | en |
dc.subject.INGV | 03. Hydrosphere::03.01. General::03.01.01. Analytical and numerical modeling | en |
dc.subject.INGV | 03. Hydrosphere::03.01. General::03.01.03. Global climate models | en |
dc.subject.INGV | 03. Hydrosphere::03.01. General::03.01.04. Ocean data assimilation and reanalysis | en |
dc.identifier.doi | 10.1175/2010MWR3350.1 | en |
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Wea. Rev., 137, 1393–1408. Vossepoel, F. C., and D. W. Behringer, 2000: Impact of sea level assimilation on salinity variability in the western equatorial Pacific. J. Phys. Oceanogr., 30, 1706–1721. Wijffels, S. E., J. Willis, C. M. Domingues, P. Barker, N. J. White, A. Gronell, K. Ridgway, and J. A. Church, 2008: Changing ex- pendable bathythermograph fall rates and their impact on esti- mates of thermosteric sea level rise. J. Climate, 21, 5657–5672. Zheng, F., J. Zhu, and R.-H. Zhang, 2007: Impact of altimetry data on ENSO ensemble initializations and predictions. Geophys. Res. Lett., 34, L13611, doi:10.1029/2007GL030451. | en |
dc.description.obiettivoSpecifico | 3.7. Dinamica del clima e dell'oceano | en |
dc.description.obiettivoSpecifico | 4.6. Oceanografia operativa per la valutazione dei rischi in aree marine | en |
dc.description.obiettivoSpecifico | 5.4. Banche dati di geomagnetismo, aeronomia, clima e ambiente | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | partially_open | en |
dc.contributor.author | Storto, A. | en |
dc.contributor.author | Dobricic, S. | en |
dc.contributor.author | Masina, S. | en |
dc.contributor.author | Di Pietro, P. | en |
dc.contributor.department | Centro Euro-Mediterraneo per i Cambiamenti Climatici, Bologna, Italy | en |
dc.contributor.department | Centro Euro-Mediterraneo per i Cambiamenti Climatici, Bologna, Italy | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | mixedopen | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | CNR-Ismar | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia | - |
crisitem.author.orcid | 0000-0001-6273-7065 | - |
crisitem.author.orcid | 0000-0002-4068-1256 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 03. Hydrosphere | - |
crisitem.classification.parent | 03. Hydrosphere | - |
crisitem.classification.parent | 03. Hydrosphere | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
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