La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	A Budget Analysis of Bottom-Water Dissolved Oxygen in Chesapeake Bay
Auteurs :	Yun Li, Auteur ; Ming Li, Auteur ; W. Michael Kemp, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (38(6) NOV 2015)
Article en page(s) :	2132-2148
Résumé :	A coupled hydrodynamic-dissolved oxygen model is developed to simulate the seasonal cycle of dissolved oxygen (DO) in Chesapeake Bay and investigate processes regulating summer hypoxia in the estuary. A budget analysis of DO in the bottom water reveals a balance between physical transport and biological consumption. In addition to the vertical diffusive flux, the longitudinal and vertical advective fluxes are important suppliers of DO to the bottom water. The longitudinal advective flux is affected not only by gravitational circulation but also by wind-driven currents. The vertical advective flux is affected by wind-driven lateral circulation and shows a strong dependence on wind speed and direction. Up-estuary winds weaken the landward bottom flow and generate a clockwise lateral circulation that exchanges DO between the deep channel and adjacent shoals, thereby reducing the longitudinal advective flux and increasing the vertical advective flux. In contrast, down-estuary winds amplify the longitudinal flux and reduce the vertical flux. During the summer, water column respiration contributes to about

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