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Dore, J. E., Montana State University, Bozeman, USA, jdore@montana.edu
Lukas, R. ., University of Hawaii, Honolulu, USA, rlukas@hawaii.edu
Church, M. J., University of Hawaii, Honolulu, USA, mjchurch@hawaii.edu
Sadler, D. W., University of Hawaii, Honolulu, USA, sadler@hawaii.edu
Karl, D. M., University of Hawaii, Honolulu, USA, dkarl@hawaii.edu

CONSISTENT TRENDS AND PATTERNS OF INTERANNUAL VARIABILITY IN SURFACE OCEAN CO2 AT CONTRASTING SITES WINDWARD AND LEEWARD OF THE HAWAIIAN ISLANDS

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, there are few such long-term programs, 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 HOT program has conducted near monthly sampling of CO2 system parameters at Station ALOHA, a deep ocean site windward and 100 km north of Oahu, Hawaii. Since 1990, parallel surface measurements have been made at Station Kahe, a leeward site 10 km from the island and on the opposite side of the Hawaiian Ridge. The observed timescales of CO2 system variability are explained by a combination of annual seasonality, a linear trend and an 11-year cycle driven by salinity fluctuations. Despite having different physical settings, the sites exhibit identical linear rates of surface pCO2 increase and pH decrease, suggesting that atmospheric forcing dominates over local dynamics in determining interannual CO2 variability in the surface waters of the North Pacific Subtropical Gyre.

Poster presentation

Session #:039
Date: 2/23/2012
Time: 17:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: A0183