Heat fluxes associated with intrusions during the SHEBA ice station drift
Lamb, Douglas Rogers.
Stanton, Timothy P.
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A yearlong set of temperature and salinity profiles from the Surface Heat Budget of the Arctic (SHEBA) is analyzed to identify intrusions from the mixed layer to a depth of 150 m. Ensemble averaged temperature and salinity profiles, spectral analysis of the vertical thermal structure, and bathymetry are used to divide the SHEBA ice station track into four regions: Beaufort Sea; Northwind Rise and break; Chukchi Plateau and break; Mendelev Abyssal Plain. Average vertical gradients of temperature and salinity over intrusive features are used to calculate Turner angles and molecular beat fluxes. Bering Sea Summer Water dominates the structure in the temperature and salinity profiles of the Northwind Rise region, with a maximum temperature intrusion of 2.2%degrees centigrade. Cold intrusions penetrate the upper halocline in the Chukchi Plateau region. The width of the distribution of Turner angle in the vertical profiles is indicative of the degree of the interleaved structure. Mesoscale features and associated internal wave activity accompany highly variable vertical structure over the Northwind Rise and Chukchi Plateau regions
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