Abstract
The annual transport of anthropogenic carbon (C anth ) to the North Pacific Intermediate Water (NPIW) from the Western Subarctic Gyre (WSG) has been re-estimated by using newly estimated Oyashio transport and C anth concentration, the latter calculated by the recently-established “∆ C*” method with some modifications. Estimated annual C anth transport through the nearshore Oyashio west of 146°E was 0.020 ± 0.010 GtC y ‐1 , closely approximating the previous estimation based on a 1-D model calibrated with the CFC vertical distribution. The present study, however, found that an additional 0.025 ± 0.010 GtC y ‐1 of C anth was transported into NPIW in the region east of 146°E. Total C anth transport, 0.045 GtC y ‐1 , contributes about 35% of annual C anth accumulation of the whole temperate North Pacific.
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