The change of nutrient situation in the Prydz Bay waters along longitude 73°E, Antarctica, in the context of global environmental change

摘要

The spatial and temporal characteristics of nutrient concentrations and their influencing factors along longitude 73 degrees E in Prydz Bay were explored. Nutrient concentrations gradually increased from the continental shelf to the open ocean in summer surface water, and the stable environment in the bay, the chlorophyll a and the ice melting were responsible for this distribution characteristic. There was also clear annual variation of nutrients in the surface water. Average concentrations of nutrients showed the highest values in 2010, while they were the lowest in 2009, which may be influenced by El Nino. In the vertical distribution, there were close relationships between chlorophyll a PO4-P, SiO3-Si, S, and NO3-N depths respectively. Moreover, the variation of water masses also influenced the distribution of nutrients. Overall, the spatial and temporal characteristics of nutrients were closely related to environmental change, and especially to the ice melting in the Prydz Bay.