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Jeudi 15 Janvier - Assessment of the subsurface ocean observing system in the Equatorial Pacific: The role of Argo in resolving intraseasonal to interannual variability

Par semsou — Dernière modification 11/12/2014 17:11
Quand ? Le 15/01/2015,
de 11:00 à 12:00
Où ? Salle Coriolis
Participants Florent Gasparin, Scripps Institution of Oceanography, UCSD
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Florent Gasparin, Scripps Institution of Oceanography, UCSD

 

Titre : Assessment of the subsurface ocean observing system in the Equatorial Pacific: The role of Argo in resolving intraseasonal to interannual variability

 

Résumé : Estimation of subsurface properties such as temperature and salinity has been significantly improved over the past two decades as a result of development and deployment of Argo floats. Here, we first assess the representativeness of oceanic conditions at different scales of variability in the Equatorial Pacific by optimizing Argo profile mapping through improved representation of the covariance function. The optimization is based on three points (i) Modelization of the Argo-sampled covariance, (ii) Consistency of the error estimation and (iii) Comparison with independent data such as TAO moorings and altimetric Sea Surface Height (SSH). The last points show that Argo can represent more than 90% of the total TAO variance and around 75% of the intraseasonal TAO variability (between 20 and 100 days) at
the Equator. Objective error estimates from the OI are used to evaluate different sampling strategies such as the recent deployment of 41 Argo floats for enhanced coverage along the Pacific equator. The new OI maps have improved resolution of intraseasonal and longer-term variability and are a step toward better utilization of existing datasets including Argo, TAO, and SSH and toward redesigning the Tropical Pacific Observing System. In a second part, the vertical structure of equatorial Pacific variability is investigated, focusing on the annual cycle because of its large contribution to the total variance, its relationship to interannual ENSO variability, and its unique equatorial wave phenomena.

Collaboration with Dean Roemmich, John Gilson, Bruce Cornuelle, and Janet Sprintall.

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