Petroleum Analyses of Seawater Samples, Mooring and Tracer Survey Cruises, Gulf of Mexico, 2012-2013.

Laboratory hydrocarbon analyses, expressed as Estimated Oil Equivalents, were performed on seawater samples collected from Niskin bottles samples collected at various depths in the Gulf of Mexico during four GISR cruises. GISR G01 05-11 July 2012, GISR G03 28-Nov to 19-Dec 2012, GISR G04 06-14 July 2013, and GISR G05 29-July to 27-Aug 2013. The associated CTD data are available in GRIIDC datasets G01: R1.x137.130-0006, G03 R1.x137.131:0003, G04 R1.x137.130:0009 and R1.x137.131:0010. The samples were analyzed for total scanning fluorescence (TSF) using a UV spectrofluorometer and total petroleum hydrocarbon (TPH) using quantitative gas chromatography flame ionization detector.