Abstract
Results of measurements of the low molecular weight halocarbons carbon tetrachloride (CCl 4) and methyl chloroform (CH 3CCl 3, 1,1,1-trichloroethane) in the Weddell Sea, Antarctica, are reported. The results, given as sections and profiles, illustrate the deep water formation that takes place in the area. Intermediate waters with undetectable levels of both compounds makes it possible to draw an upper limit to the pre-industrial atmospheric mixing ratio of carbon tetrachloride of approximately 2 parts per trillion by volume (pptv). Simple model calculations of the rate of deep water formation in this area have been carried out using the halocarbon compounds as transient tracers. Bottom water ages as low as 8–20 years are reported for the western Weddell Sea.
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