Abstract:

Physical and chemical factors, chlorophyll a in water column were measured in the Great Wall Bay, King George Island,Antarctica during austral summer in 1988-1989.Routine samples of water were taken at five sites with water depth ranges from 14 to over 100m. Water temperature and pH ranged from -1.6 to 2.2°C and from 8.0 to 9.1 respectively. Transparency of sea water ranged from 4m to 13m. Concentrations of phosphate, nitrate and nitrite ranged from 0.738 to 4.873μg P/L,6.181 to 25.945μg N/L and 0.017 to 0.273 μg N/L respectively. Chlorophyll a concentration in water column ranged from 0.21 to 2.67 mg/m 3.The maximum of chlorophyll a(2.67 mg/m 3) was observed at surface water on 26 November 1988 at site 5. In comparison with the water, chlorophyll-a concentration in the fast ice was higher,which ranged from 2.55 to 56.84 mg/m 3 and most of them were concentrated in the interior layer of sea ice rather than in the bottom layer which often observed in other sea ice such as Davis, Syowa, Casey and McMurdo Sound etc.