THE PRELIMINARY STUDY ON THE PRECIPITATION CHEMISTRY AT THE CHINESE GREAT WALL STATION, ANTARCTICA IN 1998^*

This paper reports the analysis results (including pH,conductivity and ion concentrations) of the precipitation samples collected at the Chinese Great Wall Station,Antarctica (62°13'S, 58°58'W,ASL10.0 m) in 1998.The average pH value and conductivity were 5.62 and 85.16 μS/cm,respectively.The pH value and conductivity of precipitation were higher during autumn, but lower during other seasons.The major ions in the precipitation were Cl- and Na+,followed by SO42-,Mg2+,Ca2+,K+,NO3-,NH4+ with the lower concentrations in order.The positive correlation significantly existing between the major ions,except NO3- and NH4+,indicated that those major ions might come from same sources.The fact that the relative abundances of ions in precipitation were very close to that of seawater of Antarctic Ocean indicated that marine aerosol was the dominant source of the ions of precipitation.However,there were yet other sources which may contribute to Ca2+ ion in the precipitation.The precipitation at the area was characterized by marine type chemically.