Wind-driven sea level variability on the California coast: An adjoint sensitivity analysis

TitleWind-driven sea level variability on the California coast: An adjoint sensitivity analysis
Publication TypeJournal Article
Year of Publication2014
AuthorsVerdy A., Mazloff MR, Cornuelle BD, Kim S.Y
JournalJournal of Physical Oceanography
Date Published2014/01
Type of ArticleArticle
ISBN Number0022-3670
Accession NumberWOS:000335802100025
Keywordsadjoint sensitivity; Atm; Atmosphere-ocean interaction; circulation; continental-shelf; currents; dynamics; flux; frequency; general-circulation model; Mathematical and statistical; modeling; momentum; new-england shelf; Numerical analysis; ocean; Phenomena; Sea level; southern california; structure; techniques; trapped wave theory; wind

Effects of atmospheric forcing on coastal sea surface height near Port San Luis, central California, are investigated using a regional state estimate and its adjoint. The physical pathways for the propagation of nonlocal [O(100 km)] wind stress effects are identified through adjoint sensitivity analyses, with a cost function that is localized in space so that the adjoint shows details of the propagation of sensitivities. Transfer functions between wind stress and SSH response are calculated and compared to previous work. It is found that (i) the response to local alongshore wind stress dominates on short time scales of O(1 day); (ii) the effect of nonlocal winds dominates on longer time scales and is carried by coastally trapped waves, as well as inertia-gravity waves for offshore wind stress; and (iii) there are significant seasonal variations in the sensitivity of SSH to wind stress due to changes in stratification. In a more stratified ocean, the damping of sensitivities to local and offshore winds is reduced, allowing for a larger and longer-lasting SSH response to wind stress.

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