Honjo, S. Woods Hole Oceanographic Institution, shonjo@whoi.edu
Manganini, S. Woods Hole Oceanographic Institution, smanganini@whoi.edu
Francois, R. Woods Hole Oceanographic Institution, rfrancois@whoi.edu
Collier, R. Oregon State University, rcollier@oce.orst.edu
Dymond, J. Oregon State University, jdymond@oce.orst.edu

 
EXPORT OF BIOGENIC AND LITHOGENIC PARTICLES TO THE INTERIOR OF OPEN SOUTHERN OCEAN ALONG 170 W.
 
Biogenic particles exported to the ocean's interior at the AESOPS sediment trap stations along 170 W were approximately 25 g m-2 yr-1 except at M-4 (63 S), the northern boundary of the APF zone where the biogenic flux was as large as 88.5 g m-2 yr-1 and at M-1 (53 S) where it was only 3.8 g m-2 yr-1 (at 1 km). Export flux was characterized by a large proportion of opal of up to 74% - with 13% of CaCO3 at M-4. At the M-1 this relationship was reversed; 72% CaCO3 with less than 10% opal. The annual organic carbon export at 1 km was 2 g m-2 yr-1 at the stations to the south of M-4. Organic carbon flux at M-1 station was far smaller than at other AESOPS stations (0.4 g m-2 yr-1). The large summer export bloom began in December and continued to March at M-5, 4 and 3. At M-2, the balance between these two components oscillated, possibly due to the meandering APF, while at M-1 carbonate particles prevailed throughout the year. Aluminum flux in the open Southern ocean was 1 to 10 mg m-2 yr-1 and was extremely small.
 
Day: Friday, Feb. 5
Time: 04:00 - 04:15pm
Location: Sweeney Center
 
Code: SS31FR0400S