The variability and heat budget of the upper ocean under the Chile-Peru stratus


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dc.contributor.author Colbo, Keir
dc.contributor.author Weller, Robert A.
dc.date.accessioned 2008-03-18T14:37:23Z
dc.date.available 2008-03-18T14:37:23Z
dc.date.issued 2007-09
dc.identifier.citation Journal of Marine Research 65 (2007): 607-637 en
dc.identifier.uri http://hdl.handle.net/1912/2112
dc.description Author Posting. © Sears Foundation for Marine Research, 2007. This article is posted here by permission of Sears Foundation for Marine Research for personal use, not for redistribution. The definitive version was published in Journal of Marine Research 65 (2007): 607-637, doi:10.1357/002224007783649510. en
dc.description.abstract The persistent stratus clouds found west of Chile and Peru are important for the coupling of the ocean and atmosphere in the eastern Pacific and thus in the climate of the region. The relatively cool sea-surface temperatures found west of Peru and northern Chile are believed to play a role in maintaining the stratus clouds over the region. In October 2000 a buoy was deployed at 20S, 85W, a site near the center of the stratus region, in order to examine the variability of sea-surface temperature and the temporal evolution of the vertical structure of the upper ocean. The buoy was wellinstrumented and obtained accurate time series of the surface forcing as well as time series in the upper ocean of temperature, salinity, and velocity. The variability and the extent to which local forcing explains the temporal evolution of upper ocean structure and heat content was examined. The sources of heating (primarily surface fluxes with weaker contributions from Ekman convergence and transport) are found to be balanced by cooling from the gyre-scale circulation, an eddy flux divergence and vertical diffusion. The deduced eddy flux divergence term is bounded away from zero and represents an order one source of cooling (and freshening). We postulate that the eddy flux divergence represents the effect of the cold coherent eddies formed near the coast, which propagate westward and slowly decay. Direct advection of coastal upwelled water by Ekman transport is negligible. Thus the upwelled water does influence the offshore structure, but through the fluctuating mesoscale flow not the mean transport. en
dc.description.sponsorship Support for the buoy deployments and the analysis from NOAA is greatly appreciated (Grants NA17RJ1223 and NA17RJ1224). en
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Sears Foundation for Marine Research en
dc.relation.uri http://dx.doi.org/10.1357/002224007783649510
dc.title The variability and heat budget of the upper ocean under the Chile-Peru stratus en
dc.type Article en
dc.identifier.doi 10.1357/002224007783649510

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