EarthRef.org Reference Database (ERR)
Development and Maintenance by the EarthRef.org Database Team

Detailed Reference Information
Wallace et al. 1994
Wallace, D.W.R., Beining, P. and Putzka, A. (1994). Carbon tetrachloride and chlorofluorocarbons in the South Atlantic Ocean, 19°S. Journal of Geophysical Research 99: doi: 10.1029/94JC00031. issn: 0148-0227.

Exploratory measurements of a suite of anthropogenic halocarbon compounds (CCl4, CCl2FCClF2(CFC-113), CH3CCl3, CCl3F(CFC-11) were made using a new analytical technique on RV Meteor cruise 15 along 19 ¿S in the Atlantic Ocean during February--March 1991. A separate analytical system was used 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 (≤0.02 pmol kg-1). Slightly higher levels were found close to the bottom in the deep Angola Basin: possibly an anthropogenic signature. In contrast, most of the deep Brazil Basin and all of the deep Angola Basin (>1000 m) had undetectable levels of CFC-11, CFC-12, and CFC-113. Preindustrial levels of CCl4 in the atmosphere were therefore negligible (atmospheric mixing ratio <0.1 pptv). CCl4/CFC-11 ratios are used to estimate apparent ages and dilution factors for the North Atlantic Deep Water and Antarctic Bottom Water. Whereas CCl4/CFC-11/CFC-12 levels are internally consistent in deep waters, suggesting near-conservative behavior, there is evidence for very rapid removal of CCl4 in the thermocline. Removal rates suggest that in addition to neutral hydrolysis, some other loss pathway must be involved. ¿ American Geophysical Union 1994

BACKGROUND DATA FILES

Abstract

Keywords
Oceanography, Biological and Chemical, Geochemistry, Oceanography, General, Water masses, Oceanography, Physical, Western boundary currents, Oceanography, Physical, General circulation
Journal
Journal of Geophysical Research
http://www.agu.org/journals/jb/
Publisher
American Geophysical Union
2000 Florida Avenue N.W.
Washington, D.C. 20009-1277
USA
1-202-462-6900
1-202-328-0566
service@agu.org
Click to clear formClick to return to previous pageClick to submit