Influences of precipitation on water mass transformation and deep convection
Spall, Michael A.
MetadataShow full item record
KeywordBoundary currents; Deep convection; Eddies; Meridional overturning circulation; Ocean dynamics; Stability
The influences of precipitation on water mass transformation and the strength of the meridional overturning circulation in marginal seas are studied using theoretical and idealized numerical models. Nondimensional equations are developed for the temperature and salinity anomalies of deep convective water masses, making explicit their dependence on both geometric parameters such as basin area, sill depth, and latitude, as well as on the strength of atmospheric forcing. In addition to the properties of the convective water, the theory also predicts the magnitude of precipitation required to shut down deep convection and switch the circulation into the haline mode. High-resolution numerical model calculations compare well with the theory for the properties of the convective water mass, the strength of the meridional overturning circulation, and also the shutdown of deep convection. However, the numerical model also shows that, for precipitation levels that exceed this critical threshold, the circulation retains downwelling and northward heat transport, even in the absence of deep convection.
Author Posting. © American Meteorological Society, 2012. 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 42 (2012): 1684–1700, doi:10.1175/JPO-D-11-0230.1.
Showing items related by title, author, creator and subject.
Seo, Hyodae; Subramanian, Aneesh C.; Miller, Arthur J.; Cavanaugh, Nicholas R. (American Meteorological Society, 2014-11-15)This study quantifies, from a systematic set of regional ocean–atmosphere coupled model simulations employing various coupling intervals, the effect of subdaily sea surface temperature (SST) variability on the onset and ...
Spall, Michael A. (American Meteorological Society, 2010-10)The mean downwelling in an eddy-resolving model of a convective basin is concentrated near the boundary where eddies are shed from the cyclonic boundary current into the interior. It is suggested that the buoyancy-forced ...
Whitehead, John A.; Busse, Friedrich; Howard, Louis; Doering, Charles; Constantin, Peter; Caulfield, Colm-cille; Kerswell, Richard (Woods Hole Oceanographic Institution, 2003-07)The subject of "Bounds of Turbulent Transport" was introduced in a series of ten lectures. The six lecturers constitute almost all the contributors to this subject. The subject was introduced and foundations laid by five ...