Aquatic Sciences Meeting, Albuquerque 2001
|CS07 Biogeochemical Cycles|
|Date: Thursday, February 15, 2001, Time: 10:00:00 AM|
|Kelley, C, A, University of Missouri, Columbia, MO, USA, firstname.lastname@example.org|
|DISSOLVED METHANE CONCENTRATION PROFILES AND SURFACE SATURATION RATIOS ALONG THE TRANSECT FROM 41 oS to 27 oN|
|A total of 26 dissolved methane concentration profiles were measured on a transit cruise from Punta Arenas, Chile, to Port Fourchon, LA as part of the Translatitudinal Assessment of Biological Acclimation to Solar Conditions in the Oceans (TABASCO) in July and August 2000. Nine or ten depths through the upper 350 to 450 m of the water column were sampled. Most methane profiles showed subsurface peaks within the pycnocline, with highest concentrations (up to 12 nM) occurring in the Peruvian upwelling region.|
In addition to the profile work, air-sea fluxes of methane were also determined. Calculated fluxes of methane from the sea surface to the atmosphere were highest in the equatorial region and in the Gulf of Mexico. In the Gulf of Mexico, surface concentrations were approximately 40 % supersaturated with respect to the atmosphere, whereas near the equator and in the Peruvian upwelling, 10-20 % supersaturation generally occurred.
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