Wakeham, S. G.. Skidaway Institute of Oceanography, email@example.com
Owens, K. G.. Skidaway Institute of Oceanography,
BIOMARKERS IN SUSPENDED PARTICULATE MATTER OF THE SOUTHERN OCEAN
The organic geochemistry component of the U. S. JGOFS AESOPS program is directed towards determining the composition and flux of the major biochemicals that comprise the bulk of the particulate organic materials cycled in the water column and ultimately buried in underlying sediments. As part of this program, lipid biomarkers have been measured in suspended particulate matter samples collected during cruise NBP-96-5 (sediment trap deployment cruise) along a transect from the Ross Sea (76 deg S) to New Zealand (53 deg S) in November, 1996. Samples from the surface (5 m) and chlorophyll maximum (25-50 m) were collected at sites that include the marginal ice zone, the ice-free region south of the Antarctic polar front (APF), and the South Pacific north of the APF. Distributions of hydrocarbons, sterols, long-chain alkenones and fatty acids varied along the transect, consistent with a changing phytoplankton community and with significant inputs of biomarkers from the haptophytes, Phaeocystis spp.and Emiliania huxleyi, and sea-ice diatoms, notably Nitzchia spp. Biomarkers derived from E. huxleyi were found only north of 60 deg S. The latitudinal distribution of lipid biomarkers in suspended particulate matter will be extremely useful in interpreting lipid compositions of sediment traps deployed in the Southern Ocean, analyses of which are still underway.
Day: Wednesday, Feb. 3
Location: Sweeney Center