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Oceanic uptake rate of anthropogenic CO 2 in a subpolar marginal sea: The Sea of Okhotsk
Author(s) -
Wakita Masahide,
Watanabe Yutaka W.,
Watanabe Shuichi,
Noriki Shinichiro,
Wakatsuchi Masaaki
Publication year - 2003
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 - 10.1029/2003gl018057
Subject(s) - oceanography , surface water , spring (device) , environmental science , seawater , dissolved organic carbon , geology , mechanical engineering , environmental engineering , engineering
We proposed a new simple approach for estimating the oceanic rate of increase of anthropogenic CO 2 (U anth ) in a subpolar marginal sea that produces ventilated water with the sea ice formation. This approach was based only on the differences in dissolved inorganic carbon (DIC) and apparent oxygen utilization (AOU) between the ventilated water and the source water. Applying our approach to the Sea of Okhotsk for 1993, 1999 and 2000, we estimated the averaged U anth transported into the intermediate water (U I ), and in the surface water from spring to fall (U S s∼f ) and in the surface water in winter (U S w ) to be 1.1 ± 0.9 μmol kg −1 yr −1 , 0.70 ± 0.01 μmol kg −1 yr −1 and 1.1 ± 0.9 μmol kg −1 yr −1 , respectively, during the past 8 years. The accumulation rate of anthropogenic carbon was estimated as 0.78 × 10 12 g C yr −1 over the entire Sea of Okhotsk.