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Hypoxia in the Gulf of Mexico

Nancy N. Rabalaisa, R.Eugene Turnerb and William J. Wiseman, Jr.c

a Louisiana Universities Marine Consortium, 8124 Hwy. 56, Chauvin, LA 70344
b Coastal Ecology Institute and Dep. of Oceanography and Coastal Sciences, Louisiana State Univ., Baton Rouge, LA 70803
c Coastal Studies Institute and Dep. of Oceanography and Coastal Sciences, Louisiana State Univ., Baton Rouge, LA 70803



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Fig. 1. Distribution of stations for mid-summer shelfwide surveys and more frequent sampling along transect C. Stations C6A and C6B are locations of moored instruments; station C6, not shown, is between C6A and C6B. C6* is composite data for stations C6A, C6B, and C6. Starred stations approximate the 20-m isobath

 


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Fig. 2. Distribution of near-bottom water hypoxia (<2 mg L-1) in mid-summer for 1993, 1994, and 1995 (modified from Rabalais et al., 1998)

 


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Fig. 3. Cross-shelf contours of near-bottom water hypoxia (dissolved oxygen <2 mg L-1 in stippled and <1 mg L-1 in black) for Transect C (Fig. 1) across the southeastern Louisiana shelf at monthly intervals in 1992 and 1993 for dates indicated. Data from hypoxia studies of N.N. Rabalais, R.E. Turner, and W.J. Wiseman, Jr

 


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Fig. 4. Continuous dissolved oxygen data (15-min intervals) from 19 m depth in a 20-m water column at Station C6B (Fig. 1) on the southeastern Louisiana shelf off Terrebonne Bay for April through mid-November 1993. Data from hypoxia studies of N.N. Rabalais, R.E. Turner, and W.J. Wiseman, Jr

 





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