Abstract
The ratio of noncrustal Mn/noncrustal V is five times greater for Eurasian aerosol than for eastern North American aerosol. When a decrease of this ratio during transport and aging is allowed for, the aerosol of the Norwegian Arctic in winter is seen to be compatible with a Eurasian source and incompatible with an eastern North American source. Winter aerosol of the North American Arctic seems to be affected by an additional source within Eurasia, with a still-higher Mn/V ratio. Chemical and meteorological evidence suggests that this latter source area is in the central U.S.S.R.
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