CONCENTRATION CHARACTERISTICS OF SOLUBLE IMPURITIES IN THE SURFACE SNOW OF COLLINS ICE CAP, KING GEORGE ISLAND, ANTARCTICA

摘要

Measurements carried out for the upper 10m firn/ice obtained at the main dome of Collins Ice Cap, King George Island, Antarctica revealed the direct relation of soluble impurities of snow mass to the composition of atmosphere aerosols. It was indicated that sea salt source dominates the atmosphere aerosol around Collins Ice Cap. The simultaneous variation shown by the concentration profiles of Na+, K+, Mg2+, Ca2+, SO₄2-, CI-, Br- and very close EF values （≈1） suggested their common marine source and similar deposition process. Besides the possible surface contamination,NH₄+varied uniformly along deeper part of the core in concentration, which could be considered as background value of ammonium. A satisfactory explanation for NO₃- concentration profile has not reached at present.