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GEOPHYSICAL RESEARCH LETTERS,
VOL. 33,
L06608,
5 PP., 2006
doi:10.1029/2005GL024903
Spatial and temporal variations of Richardson number on Georges Bank
School for Marine Science and Technology, University of Massachusetts Dartmouth, New Bedford, Massachusetts, USA
School for Marine Science and Technology, University of Massachusetts Dartmouth, New Bedford, Massachusetts, USA
Buoyancy frequency and shear were used to estimate spatial and temporal variations in Richardson number, Ri, on Georges Bank. Calculations were based on CTD and ADCP data from 41 stations occupied repeatedly over 17 cruises during winter and spring, 1995–1999. Stations were grouped into five spatial averaging regions, two depth zones, and two seasons. Average Ri ranged from 0.01 to 1.63 with a general tendency of increasing Ri with total water depth. Significant differences in average Ri between the two seasons and two depth zones were also found. These differences were largely due to variations in buoyancy frequency, and to a lesser degree due to variations in shear. Our results offer an empirical context for examining spatial and temporal variability of vertical mixing on the Bank.
Received 14 October 2005; accepted 10 February 2006; published 24 March 2006.
Citation: (2006), Spatial and temporal variations of Richardson number on Georges Bank, Geophys. Res. Lett., 33, L06608, doi:10.1029/2005GL024903.
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