Carbonate Chemistry Dynamics of Surface Waters in the Northern Gulf of Mexico

This paper presents the results of two cruises in the Northern Gulf of Mexico in 2008 that investigated local and short-term factors influencing the carbonate chemistry dynamics and saturation state with respect to aragonite (Ωaragonite) of surface seawater in this region. One cruise covered much of...

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Bibliographic Details
Published in:Aquatic geochemistry 2010-06, Vol.16 (3), p.337-351
Main Authors: Keul, Nina, Morse, John W, Wanninkhof, Rik, Gledhill, Dwight K, Bianchi, Thomas S
Format: Article
Language:English
Subjects:
Alkalinity
Aragonite saturation state
Brackish
Calcium carbonate
Carbon
Coastal zone
Drawdown
Earth and Environmental Science
Earth Sciences
Freshwater
Geochemistry
Hydrogeology
Hydrology/Water Resources
Hypoxia
Marine
Mississippi/Atchafalaya Rivers
Ocean acidification
Original Paper
Outlets
River plumes
Rivers
Salinity
Seawater
Supersaturation
Surface water
Water Quality/Water Pollution
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Summary:This paper presents the results of two cruises in the Northern Gulf of Mexico in 2008 that investigated local and short-term factors influencing the carbonate chemistry dynamics and saturation state with respect to aragonite (Ωaragonite) of surface seawater in this region. One cruise covered much of the northern half of the Gulf, and the other focused on the coastal zone west of the Atchafalaya Bay outlet of the Mississippi River—the region where the hypoxic “dead zone” occurs on the Louisiana shelf. Offshore waters (>100 m depth) exhibited only small variations in CO₂ fugacity (fCO₂), total alkalinity (TA) and Ωaragonite. Values were close to those typically observed in subtropical Atlantic Ocean and Caribbean Sea waters of similar salinity. However, inner shelf waters (
ISSN:1380-6165
1573-1421
DOI:10.1007/s10498-010-9091-2