Long-term variation in dissolved inorganic carbon and ocean acidification indices in the Northwest Pacific from 1993 to 2018: A study of a biogeochemical model with an operational ocean model product and observational evidence

doi:10.21203/rs.3.rs-165133/v1

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Long-term variation in dissolved inorganic carbon and ocean acidification indices in the Northwest Pacific from 1993 to 2018: A study of a biogeochemical model with an operational ocean model product and observational evidence

https://doi.org/10.21203/rs.3.rs-165133/v1

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The multi-decadal variation in ocean acidification indices in the Northwest Pacific was examined using a biogeochemical model with an operational ocean model product for the period 1993–2018. We found that ocean acidification varied regionally in the Northwest Pacific. The surface ocean (above 100 m depth) underwent acidification that progressed more quickly in the subtropical region and the Kuroshio extension than in the subarctic region due to vertical mixing of the dissolved inorganic carbon (DIC) supply exceeding DIC release by air–sea exchange. Below 100 m depth, acidification and alkalinization occurred in the subtropical and subarctic regions, respectively. We attribute these regional differences in acidification and alkalinization to spatially variable biological processes in the upper layer and physical redistribution of DIC, both horizontally and vertically.

Climatology

Climate Analysis and Modeling

biogeochemical model

Northwest Pacific

ocean acidification

ocean alkalinization

JCOPE

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FigureA.pdf
Figure A. Time-series of yearly DIC time variations from 1993 to 2018 at each layer in the subtropical region (black), Kuroshio extension (green), and the subtropical region (red), respectively. The figures in a, b, c, d indicates the time-series in the surface (0-100 m depth), the subsurface (100-500 m depth), the middle (500-1000 m depth) and the deeper layers (1000-2000 m depth), respectively.
Table1.pdf
Table 1. Averaged trends of DIC, pHinsitu, pH25 and Ωarg at each depth in the subarctic region (155°–175°E, 40°–50°N), Kuroshio Extension (142°–175° E, 30°–40°N) and subtropical region (130°–175°E, 15°–30°N), respectively. Values in the brackets indicate the p-values.

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25 Feb, 2021
First submitted to journal
27 Dec, 2020

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Long-term variation in dissolved inorganic carbon and ocean acidification indices in the Northwest Pacific from 1993 to 2018: A study of a biogeochemical model with an operational ocean model product and observational evidence

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