Abstract: 61 samples of surface suspension of particulate organic carbon (POC) were collected in Prydz Bay by the 29^th China Antarctic scientific expedition. The influencing factors of POC distribution, sources and transport processes were studied through analyzing the distribution of the POC and δ¹³C_POC value and the surface sea temperature, chlorophyll a concentration and sea ice coverage distributions measured by the satellite remote sensing. The results showed that POC concentration in the surface layer of Prydz Bay was 0.28-0.84 mg·L^-1, with an average of 0.48mg·L^-1. δ¹³C_POC values varied from -29.68 ‰ to -26.30 ‰, with an average value of -28.01 ‰. The surface POC distribution in summer shows that high values ??of POC are mainly distributed near ice shelves and POC in western survey area is higher than that in the eastern region. POC content has good correlation with chlorophyll a concentration and sea ice coverage, suggesting that POC was mainly from the phytoplankton production in the local water columns, while the growth of phytoplankton was obviously affected by sea ice. δ¹³C_POC value gradually decreases from east to west of the outside Prydz Bay, while from the shore to the sea δ¹³C_POC value gradually become more negative in the eastern survey area, suggesting that δ¹³C_POC was mainly influenced by the phytoplankton fixation CO₂ rate outside Prydz Bay waters. δ¹³C_POC value in coastal waters near Zhongshan Station was significantly more negative, Terrigenous organic detritus inputs and changes in phytoplankton species might be have contributed to the carbon isotopic values of POC.

Key words: suspended particulate matter, particulate organic carbon (POC), carbon isotopic of particulate organic carbon (δ¹³C_POC), Prydz Bay