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DiMarco, S. F., Texas A&M University, College Station, USA, sdimarco@tamu.edu
Mullins-Perry, R. L., Texas A&M University, College Station, USA, rmullins@ocean.tamu.edu
Li, B. ., Texas A&M University, College Station, USA, acelibo@tamu.edu
Chapman, P. ., Texas A&M University, College Station, USA, piers.chapman@tamu.edu
Howard, M. K., Texas A&M Unversity, College Station, USA, mkhoward@tamu.edu
Zhang, X. ., Texas A&M University, College Station, USA, zhangxq@tamu.edu

THE EFFECTS OF UPWELLING-FAVORABLE WIND FORCING ON THE EVOLUTION OF STRATIFICATION AND OXYGEN CONCENTRATION OF THE NORTHERN GULF OF MEXICO IN SUMMER 2011

Two six-day surveys of the Texas-Louisiana Shelf were conducted in June and August 2011 to estimate the spatial distribution and time evolution of the hypoxic zone of the northern Gulf of Mexico. In June, elevated freshwater volume from Mississippi River flooding was observed across the shelf from Texas to east of the Mississippi River delta. Objectively analyzed fields of dissolved oxygen concentrations show patchy hypoxic (DO less than 2 mg/L) conditions from Galveston Texas to the Mississippi River delta covered an area of 8450 sq-km. Predominately upwelling-favorable winds influenced oceanic conditions in mid-July leading to widespread normoxic and oligotrophic oceanic waters with little vertical or horizontal variability of multiple parameters on the western continental shelf and highly stratified conditions on the eastern shelf. By August, observations show hypoxia was confined to the stratified eastern shelf and covered 8770 sq-km. A newly developed operational physical circulation numerical model of the northwestern Gulf of Mexico, which includes parameterized oxygen demand, shows good agreement with the observed temperature, salinity, velocity, and oxygen oceanic fields.

http://hypoxia.tamu.edu

Poster presentation

Session #:015
Date: 2/22/2012
Time: 17:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: B0835