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Chlorofluorocarbon‐11 removal in anoxic marine waters
Author(s) -
Bullister John L.,
Lee BingSun
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl01517
Subject(s) - anoxic waters , nitrate , seawater , chlorofluorocarbon , environmental chemistry , oceanography , environmental science , biogeochemical cycle , fjord , residence time (fluid dynamics) , geology , mineralogy , chemistry , geotechnical engineering , organic chemistry
Measurements of the chlorofluorocarbons CCl 3 F (F‐11) and CCl 2 F 2 (F‐12) made in the subsurface anoxic zones of the Black Sea and Saanich Inlet, B.C., Canada show a pronounced depletion of dissolved F‐11. These zones are strongly reducing and are characterized by the absence of dissolved nitrate (NO 3 − ) and the presence of hydrogen sulfide (H 2 S). Models incorporating the atmospheric input histories of these CFCs and the observed distributions are used to estimate residence times for water in these zones and first order in‐situ removal rates for F‐11. In contrast, measurements in the mid‐depth low‐oxygen zone of the eastern Pacific (where NO 3 − is present and H 2 S is below detection limits) do not show evidence of similar rapid F‐11 removal.