Decadal change of dissolved inorganic carbon in the subarctic western North Pacific Ocean

  • Wakita M
  • Watanabe S
  • Murata A
 et al. 
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Dissolved inorganic carbon (DIC) was measured from 1992 to 2008 at two
time-series sites in the subarctic western North Pacific; this region is
a source of atmospheric CO2 in winter due to vertical mixing of deep
waters rich in DIC. To estimate the decadal DIC increase resulting from
CO2 uptake from the atmosphere, we corrected DIC for the contribution of
biological activity below the temperature minimum (T-min) layer (similar
to 100 m), which is the remnant of the mixed layer from the preceding
winter. Decadal DIC increases in the T-min layer and upper intermediate
water (1.3-1.5 mu mol kg-1 yr-1; 100-200 m) were higher than those
expected from oceanic equilibration with increasing atmospheric CO2 and
those previously reported in the open North Pacific. The increase in
water column CO2 was estimated to be 0.40 +/- 0.08 mol m-2 yr-1(.) The
decadal DIC change in the T-min layer affects winter CO2 emission. The
increase of atmospheric xCO(2) in winter (2.1 +/- 0.0 ppm yr-1) is
higher than that of oceanic xCO(2) (0.7 +/- 0.5 ppm yr-1) that
calculated from DIC and total alkalinity in the T-min layer. This
difference suggests reduction of CO2 emission in winter is possibly
controlled by the increase of total alkalinity.

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  • M Wakita

  • S Watanabe

  • A Murata

  • N Tsurushima

  • M Honda

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