Loh, A. School of Marine Science, College of William and Mary, loh@vims.edu
Bauer, J. E. School of Marine Science, College of William and Mary, bauer@vims.edu
Wolgast, D. M. Scripps Institution of Oceanography, UC San Diego, dwolgast@ucsd.edu

 
FLUXES AND RATIOS OF DISSOLVED AND PARTICULATE ORGANIC C, N AND P IN THE EASTERN NORTH PACIFIC AND SOUTHERN OCEANS
 
This study presents concurrent measurements of elemental ratios and fluxes of dissolved and suspended particulate organic carbon, nitrogen and phosphorus, as well as suspended particulate inorganic phosphorus, in the open ocean water column from eastern North Pacific and Southern oceans. Sinking POM from time-series sediment traps and surface sedimentary organic matter were also measured. Ratios of C:N, C:P and N:P were similar for DOM and suspended POM and displayed similar trends with depth. The C:P and N:P ratios for both of these pools were found to be much higher (30-400%) than average Redfield ratios, generally increasing with depth, suggesting selective remineralization of P relative to C and N. Ratios of C:N, C:P and N:P in sinking POM and SOM were also higher than Redfield, also indicating preferential remineralization of both N and P in these pools. PIP was found to comprise 10-80% of total particulate P in suspended and sinking particles and in surface sediments. A one-dimensional vertical eddy diffusive model was used to evaluate the contributions of dissolved and suspended particulate organic C, N and P fluxes from the upper mixed layer to the abyssal ocean at these sites. Vertical DOM fluxes were found to comprise 25-65% of the total organic C, N and P fluxes.
 
Day: Tuesday, Feb. 2
Time: 02:45 - 03:00pm
Location: Eldorado Hotel
 
Code: SS34TU0245E