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A NON-STEADY-STATE DIAGENETIC MODEL FOR CHANGES IN SEDIMENT BIOGEOCHEMISTRY IN RESPONSE TO SEASONALLY HYPOXIC/ANOXIC CONDITIONS BENEATH THE MISSISSIPPI RIVER PLUME
Citation:
Eldridge, P M. AND J. Morse. A NON-STEADY-STATE DIAGENETIC MODEL FOR CHANGES IN SEDIMENT BIOGEOCHEMISTRY IN RESPONSE TO SEASONALLY HYPOXIC/ANOXIC CONDITIONS BENEATH THE MISSISSIPPI RIVER PLUME. Presented at American Society of Limnology and Oceanography, Albuquerque, NM, February 12-16, 2001.
Description:
Although the bottom waters of many freshwater and marine environments are either permanently oxic or anoxic, there is a growing appreciation that in many bodies of water near-bottom conditions seasonally oscillate between these extreme. Although observational databases for these environments have increased greatly over the last decade, a quantitative understanding of the dynamics of their physical and ecological systems is not well established. For coastal waters of moderate depth, benthic processes, involving the transport of oxidized and reduced species across the sediment-water interface, can play an important role in influencing the redox conditions of overlying waters. However, there is also a feedback mechanism via which the redox conditions in the overlying water influence benthic processes. We have used our earlier work and resulting extensive data base on the Louisiana shelf in areas of seasonal hypoxic to anoxic conditions to construct a non-steady-state diagenetic model for the response of sediment biogeochemistry to changes in the redox conditions of the overlying waters.