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Paired windward and leeward biogeochemical time series reveal consistent surface ocean CO₂ trends across the Hawaiian Ridge

ScholarsArchive at Oregon State University

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Title Paired windward and leeward biogeochemical time series reveal consistent surface ocean CO₂ trends across the Hawaiian Ridge
Names Dore, John E. (creator)
Church, Matthew J. (creator)
Karl, David M. (creator)
Sadler, Daniel W. (creator)
Letelier, Ricardo M. (creator)
Date Issued 2014-09-28 (iso8601)
Note This is the publisher’s final pdf. The published article is copyrighted by the American Geophysical Union and can be found at: http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/%28ISSN%291944-8007/.
Abstract Sustained time series have provided compelling evidence for progressive acidification of the
surface oceans through exchange with the growing atmospheric reservoir of carbon dioxide. However,
few long-term programs exist, and extrapolation of results from one site to larger oceanic expanses is
hampered by the lack of spatial coverage inherent to Eulerian sampling. Since 1988, the Hawaii Ocean
Time-series program has sampled CO₂ system variables nearly monthly at Station ALOHA, a deep ocean site
windward and 115 km north of the island of Oahu. Surface measurements have also been made at Station
Kahe, a leeward site 12 km from the island and on the opposite side of the Hawaiian Ridge. Despite having
different physical settings, the sites exhibit identical rates of surface pCO₂ increase and hydrogen ion
accumulation, suggesting that atmospheric forcing dominates over local dynamics in determining the CO₂
trend in the surface waters of the North Pacific subtropical gyre.
Genre Article
Topic Carbon dioxide
Identifier Dore, J. E., Church, M. J., Karl, D. M., Sadler, D. W., & Letelier, R. M. (2014). Paired windward and leeward biogeochemical time series reveal consistent surface ocean CO₂ trends across the Hawaiian Ridge. Geophysical Research Letters, 41(18), 6459-6467. doi:10.1002/2014GL060725

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