Impact of Aquarius sea surface salinity observations on coupled forecasts for the tropical Indo-Pacific Ocean
23 pages, 12 figures, 1 table
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American Geophysical Union
2014-07
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dig-icm-es-10261-1032972020-12-09T17:45:52Z Impact of Aquarius sea surface salinity observations on coupled forecasts for the tropical Indo-Pacific Ocean Hackert, Eric C. Busalacchi, Antonio J. Ballabrera-Poy, Joaquim 23 pages, 12 figures, 1 table This study demonstrates the impact of gridded in situ and Aquarius sea surface salinity (SSS) on coupled forecasts for August 2011 until February 2014. Assimilation of all available subsurface temperature (ASSIM-Tz) is chosen as the baseline and an optimal interpolation of all in situ salinity (ASSIM-Tz-SSSIS) and Aquarius SSS (ASSIM-T z-SSSAQ) are added in separate assimilation experiments. These three are then used to initialize coupled experiments. Including SSS generally improves NINO3 sea surface temperature anomaly validation. For ASSIM-Tz-SSSIS, correlation is improved after 7 months, but the root mean square error is degraded with respect to ASSIM-Tz after 5 months. On the other hand, assimilating Aquarius gives significant improvement versus ASSIM-Tz for all forecast lead times after 5 months. Analysis of the initialization differences with the baseline indicates that SSS assimilation results in an upwelling Rossby wave near the dateline. In the coupled model, this upwelling signal reflects at the western boundary eventually cooling the NINO3 region. For this period, coupled models tend to erroneously predict NINO3 warming, so SSS assimilation corrects this defect. Aquarius is more efficient at cooling the NINO3 region since it is relatively more salty in the eastern Pacific than in situ SSS which leads to increased mixing and upwelling which in turn sets up enhanced west-to-east SST gradient and intensified Bjerknes coupling. A final experiment that uses subsampled Aquarius at in situ locations infers that high-density spatial sampling of Aquarius is the reason for the superior performance of Aquarius versus in situ SSS. Key Points Assimilation of sea surface salinity (SSS) improves coupled forecasts Aquarius outperforms in situ SSS assimilation SSS assimilation imparts a relative improved upwelling signal © 2014. American Geophysical Union. All Rights Reserved This research is supported by NASA Physical Oceanography grant NNX12AN08G and the Ocean Salinity Science Team (NNX09AU74G). Ballabrera-Poy was supported by the MIDAS-7 AYA2012-39356-C05-03 Spanish grant Peer Reviewed 2014-10-14T08:40:46Z 2014-10-14T08:40:46Z 2014-07 2014-10-14T08:40:46Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1002/2013JC009697 e-issn: 2169-9291 Journal of Geophysical Research: Oceans 119(7): 4045-4067 (2014) http://hdl.handle.net/10261/103297 10.1002/2013JC009697 https://doi.org/10.1002/2013JC009697 open American Geophysical Union |
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| description |
23 pages, 12 figures, 1 table |
| format |
artículo |
| author |
Hackert, Eric C. Busalacchi, Antonio J. Ballabrera-Poy, Joaquim |
| spellingShingle |
Hackert, Eric C. Busalacchi, Antonio J. Ballabrera-Poy, Joaquim Impact of Aquarius sea surface salinity observations on coupled forecasts for the tropical Indo-Pacific Ocean |
| author_facet |
Hackert, Eric C. Busalacchi, Antonio J. Ballabrera-Poy, Joaquim |
| author_sort |
Hackert, Eric C. |
| title |
Impact of Aquarius sea surface salinity observations on coupled forecasts for the tropical Indo-Pacific Ocean |
| title_short |
Impact of Aquarius sea surface salinity observations on coupled forecasts for the tropical Indo-Pacific Ocean |
| title_full |
Impact of Aquarius sea surface salinity observations on coupled forecasts for the tropical Indo-Pacific Ocean |
| title_fullStr |
Impact of Aquarius sea surface salinity observations on coupled forecasts for the tropical Indo-Pacific Ocean |
| title_full_unstemmed |
Impact of Aquarius sea surface salinity observations on coupled forecasts for the tropical Indo-Pacific Ocean |
| title_sort |
impact of aquarius sea surface salinity observations on coupled forecasts for the tropical indo-pacific ocean |
| publisher |
American Geophysical Union |
| publishDate |
2014-07 |
| url |
http://hdl.handle.net/10261/103297 |
| work_keys_str_mv |
AT hackertericc impactofaquariusseasurfacesalinityobservationsoncoupledforecastsforthetropicalindopacificocean AT busalacchiantonioj impactofaquariusseasurfacesalinityobservationsoncoupledforecastsforthetropicalindopacificocean AT ballabrerapoyjoaquim impactofaquariusseasurfacesalinityobservationsoncoupledforecastsforthetropicalindopacificocean |
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