Results of the US IOOS testbed for comparison of hydrodynamic and dissolved oxygen models of the Chesapeake Bay
Friedrichs, M.A.M. Bever, A. J. Scully, M. E. Long, W.
Friedrichs, M.A.M.
Bever, A. J.
Scully, M. E.
Long, W.
Abstract
Results from multiple 3-D hydrodynamic and dissolved oxygen models for Chesapeake Bay have been compared to each other and to EPA monitoring data for the years 2004 and 2005. On seasonal time-scales, the models all do well in capturing fundamental aspects of the hydrodynamic and oxygen fields, although the intensity of the pycnocline is underestimated. Models with constant net respiration independent of nutrient supply reproduce hypoxia nearly as well as much more complex, nutrient-dependent ecological models. Seasonal variation in DO was insensitive to seasonal cycles in the respiration rate, freshwater input, and density stratification. Rather, seasonal variation in DO was found to be very sensitive to seasonal variations in the wind, likely due to seasonal variations in the nature of windinduced lateral and longitudinal advection. The overall intensity of stratification and resulting hypoxic volume was also found to be sensitive to numerical formulations of turbulence closure and advection. Another significant finding with regards to future modeling strategies is the result that the ensemble hindcast for dissolved oxygen using multiple models was more accurate than the hindcast from any one model.
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2012-02-20
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Virginia Institute of Marine Science