【Title】Distribution of nutrients and Chla in Prydz Bay during the austral summer of 2011
Water samples in Prydz Bay were collected during the Antarctic summer of 2011 and the contents of Chla and nutrients were analyzed. The results showed that the distribution of Chla in the surface water of Prydz Bay was: margin of ice shelf> continental shelf>continental slope and open sea, melting of ice and stability of water body were the main factors that had influence on the Chla distribution in the surface water. The vertical distribution of Chla was relate to the irradiation condition, mostly upper water had high content and decreased with the depth。Horizontal and vertical distribution of phosphate, silicate and nitrate was contrary to that of Chla. Distribution of ammonium in the surface water was contrary to that of main nutrients. The vertical distribution of ammonium at the margin of ice shelf and in the continental shelf was different with that in the continental slope and open sea. The degradation of organic matters mainly control the ammonium content in the water column at the margin of ice shelf and in the continental shelf, however the balance between uptake by phytoplankton and degradation of organic matters controlled that in the continental slope and open sea. According to the contents and distribution of Chla and nutrients, the cause of DCM and the inhibition of ammonium on nitrate uptake in the surface water south of 67.5°S were discussed.