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Open-File Report 2007-1024

Biological, Physical and Chemical Data From Gulf of Mexico Gravity and Box Core MRD05-04

By Lisa E. Osterman¹, Pamela L. Campbell², Peter W. Swarzenski¹, and John P. Ricardo¹

¹ U.S. Geological Survey, 600 4th St. South, St. Petersburg FL 33701
² College of Marine Sciences, University of South Florida, 140 7th Ave. S. St. Petersburg FL 33701

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This paper presents the benthic foraminiferal census data, magnetic susceptibility measurements, vanadium and organic geochemistry (carbon isotope, sterols, and total organic carbon) data from the MRD05-04 gravity and box cores. The MRD05-04 cores were obtained from the Louisiana continental shelf in an on-going initiative to examine the geographic and temporal extent of hypoxia, low-oxygen bottom-water content, and geochemical transport. The development of low-oxygen bottom water conditions in coastal waters is dependent upon a new source of bio-available nutrients introduced into a well-stratified water column. A number of studies have concluded that the development of the current seasonal hypoxia (dissolved oxygen < 2 mg L-1) in subsurface waters of the northern Gulf of Mexico is related to increased transport of nutrients (primarily nitrogen, but possibly also phosphorous) by the Mississippi River. However, the development of earlier episodes of seasonal low-oxygen subsurface water on the Louisiana shelf may be related to Mississippi River discharge.

First posted May 24, 2010

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Suggested citation:

Osterman, L.E., Campbell, P.L., Swarzenski, P.W., Ricardo, J.P., 2007, Biological, physical and chemical data from Gulf of Mexico gravity and box core MRD05-04: U.S. Geological Survey Open-File Report 2007-1024, 18 p.

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