McNichol, A. P., NOSAMS/WHOI, Woods Hole, USA,
Sonnerup, R. E., JISAO/UW, Seattle, USA,
Arsenault, M. A., U.S. Geological Survey, Woods Hole Science Center, Woods Hole, USA,


We applied a multi-parameter mixing approach to quantify anthropogenic changes in the delta-13C of dissolved inorganic carbon (DI13C) (Sonnerup et al. 2007) to WOCE DI13C sections in the Pacific (P13N, P15, P18 and P06), Indian (I2, I3 and I8S/I9S) and Atlantic (A20 and A22) Oceans. Central to analysis is the proper selection of endmember water masses for the analyzed sections. For each ocean basin, we chose four endmembers using potential temperature/salinity diagrams. Additional constraints were imposed based on the physical and chemical properties of the individual basins. In the South Pacific Ocean, the calculated surface and depth-integrated delta13C changes are largest in the subtropics and decrease towards the south. In the South Indian Ocean, a similar pattern in depth-integrated changes was observed. Also, the greatest surface changes were observed north of 20S, and decreased to the limit of detection south of 50S. The North Atlantic reconstructions indicate that the maximum delta13C changes are fully equilibrated with respect to the atmosphere. We will present details of the reconstructions for each basin as well as maps of the total anthropogenic changes in the South Pacific and South Indian Oceans.

Poster presentation

Presentation is given by student: No
Session #:008
Date: 03-06-2008
Time: 17:30 - 19:30

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