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It is a preview of subscription content, log in by means of an institution to examine entry. Entry this articleThis may be due to dust storm action in central Asia. The buy of important ionic concentrations in the snow packs was determined for being Ca2+ > SO4 two??> NH4 + > NO3 ??> Cl?? Na+ > Mg2+ > K+. Ca2+ was the dominant cation; SO4 two??was t