3:45 PM - 4:00 PM
[AOS16-02] Seasonal variations of oceanic CO2 disequilibrium and anthropogenic CO2 in the subarctic North Pacific
Keywords:Air-sea CO2 disequilibrium, Anthropogenic CO2, Subarctic North Pacific
Cdiseq = CMLD – Csat, MLD – Csoft, MLD – Ccarb, MLD
where CMLD is the observed dissolved inorganic carbon (DIC); Csat, MLD is saturated DIC; Csoft, MLD is derived from the remineralization of organic matter; Ccarb, MLD is derived from the dissolution of CaCO3 in the MLD. We collected the DIC and total alkalinity (TA) samples in the subarctic North Pacific in four seasons, and measured all the DIC and TA by using semi-closed cell simultaneous method [Li et al., 2016].
Cdiseq in this region changed from –38.29 to −56.93 μmol kg-1 in wintertime and from −9.65 to 1.02 μmol kg-1 summertime, indicating a strong seasonal change in Cdiseq. Appling these values of Cdiseq to the approach for estimating Cant in this region, we also found a strong seasonal variation in Cant.