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Margolin, A. R., University of Colorado, Boulder, USA, andrew.margolin@colorado.edu
Lovenduski, N. S., University of Colorado, Boulder, USA, nicole.lovenduski@colorado.edu
Pierpont, C. G., University of Colorado, Boulder, USA, pierpont@colorado.edu

DECADAL CHANGE AND REGIONAL TRENDS OF PH THROUGHOUT THE SOUTHERN OCEAN

Recent studies show that the Southern Ocean is experiencing changes in its carbon chemistry due to the uptake of anthropogenic carbon dioxide (CO2) from the atmosphere, a process that lowers the pH. These changes have reduced the surface carbonate concentration of the Southern Ocean by more than 10% when compared to preindustrial levels. Here, we use total alkalinity, dissolved inorganic carbon, and the partial pressure or fugacity of CO2 to quantify the change of pH throughout the Southern Ocean. We calculate pH at every location where two of the parameters were measured on over sixty hydrographic cruises, creating an array of new pH data. Profiles of decadal pH change from multiple repeat cruises are used to determine focus regions where pH change is most dramatic for further trend analysis. Using measurements from the 1970’s to the present day we examine the vertical and spatial heterogeneity in trend patterns, and comment on the statistical significance of pH trends. Implications of these results will be used to assess carbon-climate model performance.

http://rintintin.colorado.edu/~margolia/home.html

Poster presentation

Session #:004
Date: 2/20/2012
Time: 17:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: Yes

PosterID: B2061