| Summary: | Rising atmospheric CO, concentration have led to greater CO, uptake by the ocean with a decrease in pH of seawater (i.e. ocean acidification). To elucidate the effects of ocean acidification On natural phytoplankton assemblages, CO, manipulated incubation experiments were conducted in the NW subarctic Pacific and Bering Sea in summer of2008 and 2009, respectively. Phytoplankton pigments samples were analyzed by HPLC with the algorithm CHEMT AX. As a result, an increase in pCO, in seawater depressed a specific phytoplankton group at least and the effect differed among the sea areas. Since export flux of organic carbon from the surface to ocean interior (i.e. biological pump) largely depends on the relative abundance of each phytoplankton group. Ocean acidification has a significant impact on the CO, absorption ability in situ. I plan to do more detailed field and laboratory studies to examine physiological conditions in relation to CO, fixation of phytoplankton. 「北海道大学総長賞 （最優秀賞）」受賞
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