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Evaluating Oceanic Uptake of Atmospheric CCl 4 : A Combined Analysis of Model Simulations and Observations
Author(s) -
Suntharalingam P.,
Buitenhuis E.,
Carpenter L. J.,
Butler J. H.,
Messias M. J.,
Andrews S. J.,
Hackenberg S. C.
Publication year - 2019
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 - 10.1029/2018gl080612
Subject(s) - environmental science , flux (metallurgy) , biogeochemistry , range (aeronautics) , climatology , atmospheric sciences , general circulation model , atmosphere (unit) , ocean current , meteorology , geology , oceanography , chemistry , climate change , physics , materials science , organic chemistry , composite material
Abstract We provide new estimates of the air‐sea flux of CCl 4 using simulations from a global ocean biogeochemistry model (NEMO‐PlankTOM) in combination with depth‐resolved CCl 4 observations from global oceanic databases. Estimates of global oceanic CCl 4 uptake are derived from a range of model analyses, including prescribed parameterizations using reported values on hydrolysis and degradation, and analyses optimized using the global observational databases. We evaluate the sensitivity of our results to uncertainties in air‐sea gas exchange parameterization, estimation period, and circulation processes. Our best constrained estimate of ocean CCl 4 uptake for the period 1996–2000 is 20.1 Gg/year (range 16.6–22.7), corresponding to estimates of the partial atmospheric lifetime with respect to ocean uptake of 124 (110–150) years. This new oceanic lifetime implies higher emissions of CCl 4 than currently estimated and therefore a larger missing atmospheric source of CCl 4 .