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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Sediment and Lower Water Column Oxygen Consumption in the Seasonally Hypoxic Region of the Louisiana Continental Shelf
Auteurs :	Michael C. Murrell, Auteur ; John C. Lehrter, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (34(5) SEP 2011)
Article en page(s) :	912-924
Résumé :	We report integrated measurements of sediment oxygen consumption (SOC) and bottom water plankton community respiration rates (WR) during eight cruises from 2003 to 2007 on the Louisiana continental shelf (LCS) where hypoxia develops annually. Averaged by cruise, SOC ranged from 3.9 to 25.8 mmol O(2) m(-2) day(-1), whereas WR ranged from 4.1 to 10.8 mmol O(2) m(-3) day(-1). Total below-pycnocline respiration rates ranged from 46.4 to 104.5 mmol O(2) m(-2) day(-1). In general, below-pycnocline respiration showed low variability over a large geographic and temporal range, and exhibited no clear spatial or inter-annual patterns. SOC was strongly limited by dissolved oxygen (DO) in the overlying water; whereas, WR was insensitive to low DO, a relationship that may be useful for parameterizing future models. The component measures, WR and SOC, were similar to most prior measurements, both from the LCS and from other shallow estuarine and coastal environments. The contribution of SOC to total below-pycnocline respiration averaged 20 +/- 4%, a finding that differs from several prior LCS studies, but one that was well supported from the broader estuarine and oceanic literature. The data reported here add substantially to those available for the LCS, thus helping to better understand oxygen dynamics on the LCS.

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