CARBON-TETRACHLORIDE AND CHLOROFLUOROCARBONS IN THE SOUTH-ATLANTIC OCEAN, 19-DEGREES-S

Exploratory measurements of a suite of anthropogenic halocarbon compou nds (CCl4, CCl2FCClF2 (CFC-113), CH3CCl3, CCl3F (CFC-11)) were made us ing a new analytical technique on RV Meteor cruise 15 along 19-degrees -S (World Ocean Circulation Experiment (WOCE) Line A9)) in the Atlanti c Ocean during February-March 1991. A separate analytical system was u sed to determine CCl2F2 (CFC-12) and CCl3F (CFC-11). A limited number of CFC-113 profiles indicated that it was undetectable below 400-500 m . The CCl4 data indicate that the entire Brazil Basin contains readily measurable levels of CCl4 (>0.05 pmol kg-1), whereas the deep Angola Basin contains very low levels (less-than-or-equal-to 0.02 pmol kg-1). Slightly higher levels were found close to the bottom in the deep Ang ola Basin: possibly an anthropogenic signature. In contrast, most of t he deep Brazil Basin and all of the deep Angola Basin (> 1000 m) had u ndetectable levels of CFC-11, CFC-12, and CFC-113. Preindustrial level s of CCl4 in the atmosphere were therefore negligible (atmospheric mix ing ratio <0.1 pptv). CCl4/CFC-11 ratios are used to estimate apparent ages and dilution factors for the North Atlantic Deep te an Antarctic Bottom Water. Whereas CCl4/CFC-11/CFC-12 levels are internally consis tent in deep waters, suggesting near-conservative behavior, there is e vidence for very rapid removal of CCl4 in the thermocline. Removal rat es suggest that in addition to neutral hydrolysis, some other loss pat hway must be involved.