Mechanisms governing interannual variability of upper-ocean temperature in a global ocean hindcast simulation


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dc.contributor.author Doney, Scott C.
dc.contributor.author Yeager, Stephen G.
dc.contributor.author Danabasoglu, Gokhan
dc.contributor.author Large, William G.
dc.contributor.author McWilliams, James C.
dc.date.accessioned 2010-12-02T14:56:17Z
dc.date.available 2010-12-02T14:56:17Z
dc.date.issued 2007-07
dc.identifier.citation Journal of Physical Oceanography 37 (2007): 1918-1938 en_US
dc.identifier.uri http://hdl.handle.net/1912/4151
dc.description Author Posting. © American Meteorological Society, 2007. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 37 (2007): 1918-1938, doi:10.1175/jpo3089.1. en_US
dc.description.abstract The interannual variability in upper-ocean (0–400 m) temperature and governing mechanisms for the period 1968–97 are quantified from a global ocean hindcast simulation driven by atmospheric reanalysis and satellite data products. The unconstrained simulation exhibits considerable skill in replicating the observed interannual variability in vertically integrated heat content estimated from hydrographic data and monthly satellite sea surface temperature and sea surface height data. Globally, the most significant interannual variability modes arise from El Niño–Southern Oscillation and the Indian Ocean zonal mode, with substantial extension beyond the Tropics into the midlatitudes. In the well-stratified Tropics and subtropics, net annual heat storage variability is driven predominately by the convergence of the advective heat transport, mostly reflecting velocity anomalies times the mean temperature field. Vertical velocity variability is caused by remote wind forcing, and subsurface temperature anomalies are governed mostly by isopycnal displacements (heave). The dynamics at mid- to high latitudes are qualitatively different and vary regionally. Interannual temperature variability is more coherent with depth because of deep winter mixing and variations in western boundary currents and the Antarctic Circumpolar Current that span the upper thermocline. Net annual heat storage variability is forced by a mixture of local air–sea heat fluxes and the convergence of the advective heat transport, the latter resulting from both velocity and temperature anomalies. Also, density-compensated temperature changes on isopycnal surfaces (spice) are quantitatively significant. en_US
dc.description.sponsorship This work was supported in part from NOAA Office of Global Programs ACCP Grant NA86GP0290, NSF Grant OCE96-33681, and the WHOI Ocean and Climate Change Institute. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Meteorological Society en_US
dc.relation.uri http://dx.doi.org/10.1175/jpo3089.1
dc.subject Temperature en_US
dc.subject Interannual variability en_US
dc.subject Advection en_US
dc.subject Heating en_US
dc.subject Air–sea interaction en_US
dc.title Mechanisms governing interannual variability of upper-ocean temperature in a global ocean hindcast simulation en_US
dc.type Article en_US
dc.identifier.doi 10.1175/jpo3089.1

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