NDLI: Texas Coastal Hypoxia Linked to Brazos River Discharge as Revealed by Oxygen Isotopes

Content Provider	Springer Nature Link
Author	DiMarco, Steven F. Strauss, Josiah May, Nelson Mullins Perry, Ruth L. Grossman, Ethan L. Shormann, David
Copyright Year	2012
Abstract	Hypoxic conditions in the coastal waters off Texas (USA) were observed since the late 1970s, but little is known about the causes of stratification that contribute to hypoxia formation. Typically, this hypoxia is attributed to downcoast (southwestward) advection of waters from the Mississippi–Atchafalaya River system. Here, we present evidence for a hypoxic event on the inner shelf of Texas coincident with the presence of freshwater linked to high flow of the Brazos River in Texas. These conclusions are based on hydrographic observations and isotopic measurements of waters on the inner shelf near the Brazos River mouth. These data characterize the development, breakdown, and dispersal of a hypoxic event lasting from June through September 2007 off the Texas coast. Oxygen isotope compositions of shelf water indicate that (1) discharge from the Brazos River was the principal source of freshwater and water column stratification during the 2007 event, and (2) during low Brazos River discharge in 2008, freshwater on the Texas shelf was derived mainly from the Mississippi–Atchafalaya River System. Based on these findings, we conclude that the Mississippi–Atchafalaya River System is not the sole cause of hypoxia in the northern Gulf of Mexico; however, more data are needed to determine the relative influence of the Texas versus Mississippi rivers during normal and low flow conditions of Texas rivers.
Starting Page	159
Ending Page	181
Page Count	23
File Format	PDF
ISSN	13806165
Journal	Aquatic Geochemistry
Volume Number	18
Issue Number	2
e-ISSN	15731421
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-01-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coastal hypoxia Stratification Oxygen isotopes Continental shelf processes Gulf of Mexico Texas Hydrogeology Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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