Park, M. M. Pukyong National University, mopark@dolphin.pknu.ac.kr
Bidigare, R. M. University of Hawaii, bidigare@iniki.soest.hawaii.edu
Hales, B. B. Oregon State University, bhales@oce.orst.edu

 
DISTRIBUTION OF ALGAL PIGMENTS IN THE ROSS SEA DURING THE 1997 SPRING BLOOMDISTRIBUTION OF ALGAL PIGMENTS IN THE ROSS SEA DURING THE 1997 SPRING BLOOM
 
We participated in several AESOPS cruises to identify the factors which control phytoplankton distributions in the Ross Sea. To achieve this goal, we used pigment biomarkers as proxies for phytoplankton biomass and composition. Here we report the initial results obtained during November-December 1997, a period which encompassed the development of the spring bloom. Pigment concentrations were determined along a transect (169E - 178W, 76.5S) occupied during YD331-335 and YD342-345. SeaSoar measurements of a variety of physico-chemical parameters were made during the intervening period (YD336-337). Two zones of elevated chlorophyll were identified. The first was located 175-250 km off the coast of Victoria Land and was dominated by Phaeocystis antarctica (19'-hexanoyloxyfucoxanthin), chlorophytes (lutein) and cryptophytes (alloxanthin). The second was located 300-400 km off the coast and was dominated by diatoms (fucoxanthin) and dinoflagellates (peridinin). The SeaSoar data revealed that these zones were separated by an intrusion of modified Circumpolar Deep Water which flowed onto the Ross Sea shelf. While both zones were characterized by depletions in pCO2, the removal of macro-nutrients was highly dependent upon algal composition. The pigment patterns reported here are very different from those reported for the Ross Sea during summertime.
 
Day: Wednesday, Feb. 3
Time: Poster
Location: Sweeney Center
 
Code: SS31WE0219S