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.
Atmospheric forcing during active convection in the Labrador Sea and its impact on mixed-layer depth Schulze, Lena M.; Pickart, Robert S.; Moore, G. W. K. (John Wiley & Sons, 2016-09-22)Hydrographic data from the Labrador Sea collected in February–March 1997, together with atmospheric reanalysis fields, are used to explore relationships between the air-sea fluxes and the observed mixed-layer depths. The ...
Whitehead, John A.; Behn, Mark D. (John Wiley & Sons, 2015-06-02)Continents on Earth periodically assemble to form supercontinents and then break up again into smaller continental blocks (the Wilson cycle). Previous highly developed numerical models incorporate fixed continents while ...
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 ...