Thermohaline structure in the California Current System : observations and modeling of spice variance


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dc.contributor.author Todd, Robert E.
dc.contributor.author Rudnick, Daniel L.
dc.contributor.author Mazloff, Matthew R.
dc.contributor.author Cornuelle, Bruce D.
dc.contributor.author Davis, Russ E.
dc.date.accessioned 2012-03-20T19:22:31Z
dc.date.issued 2012-02-03
dc.identifier.citation Journal of Geophysical Research 117 (2012): C02008 en_US
dc.identifier.uri http://hdl.handle.net/1912/5087
dc.description Author Posting. © American Geophysical Union, 2012. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 117 (2012): C02008, doi:10.1029/2011JC007589. en_US
dc.description.abstract Upper ocean thermohaline structure in the California Current System is investigated using sustained observations from autonomous underwater gliders and a numerical state estimate. Both observations and the state estimate show layers distinguished by the temperature and salinity variability along isopycnals (i.e., spice variance). Mesoscale and submesoscale spice variance is largest in the remnant mixed layer, decreases to a minimum below the pycnocline near 26.3 kg m−3, and then increases again near 26.6 kg m−3. Layers of high (low) meso- and submesoscale spice variance are found on isopycnals where large-scale spice gradients are large (small), consistent with stirring of large-scale gradients to produce smaller scale thermohaline structure. Passive tracer adjoint calculations in the state estimate are used to investigate possible mechanisms for the formation of the layers of spice variance. Layers of high spice variance are found to have distinct origins and to be associated with named water masses; high spice variance water in the remnant mixed layer has northerly origin and is identified as Pacific Subarctic water, while the water in the deeper high spice variance layer has southerly origin and is identified as Equatorial Pacific water. The layer of low spice variance near 26.3 kg m−3 lies between the named water masses and does not have a clear origin. Both effective horizontal diffusivity, κh, and effective diapycnal diffusivity, κv, are elevated relative to the diffusion coefficients set in the numerical simulation, but changes in κh and κv with depth are not sufficient to explain the observed layering of thermohaline structure. en_US
dc.description.sponsorship We gratefully acknowledge funding from the Gordon and Betty Moore Foundation, the Coastal Ocean Currents Monitoring Project (COCMP), and NOAA. R. E. Todd was partially supported by the Postdoctoral Scholar Program at the Woods Hole Oceanographic Institution, with funding provided by the Cooperative Institute for the North Atlantic Region. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Geophysical Union en_US
dc.relation.uri http://dx.doi.org/10.1029/2011JC007589
dc.subject California Current System en_US
dc.subject Adjoint model en_US
dc.subject Glider en_US
dc.subject Passive tracer en_US
dc.subject Spice en_US
dc.subject Thermohaline structure en_US
dc.title Thermohaline structure in the California Current System : observations and modeling of spice variance en_US
dc.type Article en_US
dc.description.embargo 2012-08-03
dc.identifier.doi 10.1029/2011JC007589

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