Biomarker Records in Sediment Core of R12a from the Chukchi Sea during the Last 500 Years

Key words: 
• biomarkers

Abstract: This paper used multibiomarkers to study the R12a core' s top 40 cm samples' phytoplankton and community sampled during the Second Chinese Arctic expedition from the Chukchi Sea in summer, 2003, and to abtain the information of the phytoplankton production and community change since 500 a.The results indicate the total and individual primary productivity increased over the last 500 a. The phytoplankton community structure mostly show the contributions of coccolithforids decreased, the contribution of diatoms increased, and the relative abundances of dinoflagellates not have obvious changes. This may be related with the Chukchi Sea's nutrients structure which is determined by the waters from the north Pacific Ocean and the summer ice cover change in the Chukchi Sea.