Salinity model errors induced by wind stress uncertainties in the Macaronesian region
9 pages, 10 figures, 1 table
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| Format: | artículo biblioteca |
| Language: | English |
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Elsevier
2009-05-18
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| Subjects: | Sea surface salinity, Model error covariances, Ensemble modelling, Regional ocean modelling, Wind stress forcing, Eastern subtropical North-Atlantic Ocean, SSS, |
| Online Access: | http://hdl.handle.net/10261/15358 |
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dig-icm-es-10261-153582020-11-19T08:31:35Z Salinity model errors induced by wind stress uncertainties in the Macaronesian region Mourre, Baptiste Ballabrera-Poy, Joaquim Sea surface salinity Model error covariances Ensemble modelling Regional ocean modelling Wind stress forcing Eastern subtropical North-Atlantic Ocean SSS 9 pages, 10 figures, 1 table Motivated by the imminent launches of two Sea Surface Salinity (SSS) satellite missions, this paper investigates salinity error covariances due to wind stress uncertainties in a regional simulation of the eastern North-Atlantic Ocean from 2000 to 2006. This work follows the study by Mourre et al. (2008), which concluded that the wind stress forcing was the main source of SSS model error in this region. The present study is based on ensemble simulations that start from the same initial conditions but are driven by different wind stresses. The error modes of the wind stress forcing field are approximated by the variability modes of the wind stress. Our results indicate that the surface salinity ensemble spread has an average value over the modelling domain of around 0.1 psu. Under the influence of model dynamics, the largest spreads are found in areas of significant SSS advection. The surface salinity spread also experiences a significant temporal variability at seasonal and interannual scales. The periods of error growth have a duration around 3–4 months. Horizontal SSS error correlation distances are inhomogeneous and anisotropic due to ocean dynamics. They are larger than 100 km almost everywhere in the domain, and can extend over 400 km along the path of the main surface currents. In addition, salinity and temperature anomalies induced by the wind stress forcing are not confined to the surface layers, but propagate into the ocean interior under the influence of vertical dynamical processes. Vertical salinity error correlation distances from the surface are locally larger than the annual maximum mixed layer depth. In areas where subduction occurs, the vertical correlation radii exceed 500 m. According to these results, it is expected that satellite SSS data assimilation in this region will be challenging because (i) the magnitude of the SSS model error is of the same order as the accuracy of the observations, and (ii) the horizontal SSS error correlation scales are comparable to the spatial resolution of satellite SSS products. On the positive side, the temporal resolution of satellite SSS data is finer than the time scale of SSS model error growth This work was supported by the Spanish National Program on Space, under the contracts ESP2005-06823-C05 and ESP2007-65667-C04 Peer reviewed 2009-07-26T11:52:10Z 2009-07-26T11:52:10Z 2009-05-18 artículo http://purl.org/coar/resource_type/c_6501 Ocean Modelling 29(3): 213-221 (2009) 1463-5003 http://hdl.handle.net/10261/15358 10.1016/j.ocemod.2009.05.002 en https://doi.org/10.1016/j.ocemod.2009.05.002 none 836316 bytes application/pdf Elsevier |
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| language |
English |
| topic |
Sea surface salinity Model error covariances Ensemble modelling Regional ocean modelling Wind stress forcing Eastern subtropical North-Atlantic Ocean SSS Sea surface salinity Model error covariances Ensemble modelling Regional ocean modelling Wind stress forcing Eastern subtropical North-Atlantic Ocean SSS |
| spellingShingle |
Sea surface salinity Model error covariances Ensemble modelling Regional ocean modelling Wind stress forcing Eastern subtropical North-Atlantic Ocean SSS Sea surface salinity Model error covariances Ensemble modelling Regional ocean modelling Wind stress forcing Eastern subtropical North-Atlantic Ocean SSS Mourre, Baptiste Ballabrera-Poy, Joaquim Salinity model errors induced by wind stress uncertainties in the Macaronesian region |
| description |
9 pages, 10 figures, 1 table |
| format |
artículo |
| topic_facet |
Sea surface salinity Model error covariances Ensemble modelling Regional ocean modelling Wind stress forcing Eastern subtropical North-Atlantic Ocean SSS |
| author |
Mourre, Baptiste Ballabrera-Poy, Joaquim |
| author_facet |
Mourre, Baptiste Ballabrera-Poy, Joaquim |
| author_sort |
Mourre, Baptiste |
| title |
Salinity model errors induced by wind stress uncertainties in the Macaronesian region |
| title_short |
Salinity model errors induced by wind stress uncertainties in the Macaronesian region |
| title_full |
Salinity model errors induced by wind stress uncertainties in the Macaronesian region |
| title_fullStr |
Salinity model errors induced by wind stress uncertainties in the Macaronesian region |
| title_full_unstemmed |
Salinity model errors induced by wind stress uncertainties in the Macaronesian region |
| title_sort |
salinity model errors induced by wind stress uncertainties in the macaronesian region |
| publisher |
Elsevier |
| publishDate |
2009-05-18 |
| url |
http://hdl.handle.net/10261/15358 |
| work_keys_str_mv |
AT mourrebaptiste salinitymodelerrorsinducedbywindstressuncertaintiesinthemacaronesianregion AT ballabrerapoyjoaquim salinitymodelerrorsinducedbywindstressuncertaintiesinthemacaronesianregion |
| _version_ |
1777665665144979456 |