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An ice core 103 m long was extracted in 1980 from an altitude of 5340 m on the icefield plateau of Mount Logan, Yukon Territory (Iat 60'35'N, long 140'30'W). The firn-ice transitIOn occurs at a depth of 65 ID, corresponding to about the year 1880.The chemistry of this upper 65 m is apparently dominated by acid-ion species, the peaks in which are provisionally identified with several documented volcanic events. Although the analyses cover only selected discontinuous intervals, it appears that there is no significant long-term trend in the background acidity level of the precipitation at this location over the past century, in contrast to the results from the North American Arctic and Greenland.Nitrate ion concentration shows pseudo-seasonal variations, which may be associated with stratospheric-tropospheric interactions, although other seasonally linked mechanisms are possible. This result has also been reported for ice-core sequences from Greenland. Other nitrate pulses are tentatively associated with local vo lcanic events and a possi ble meteorite even t (the en try of Tunguska in 1908). One of the largest short-term sources of sulfate ions is probably from volcanic activity on the north Pacific rim. Background volcanically-q uiet nitrate and sulfate ion concentrations are compared with similar Greenland data in an attempt to throw further light on the origin of the acids.Since the moisture for this precipitation originates primarily in the Gulf of Alaska, the data has particular relevance to that region. Short-term climatic changes, as reflected by the oxygen isotope (S 18 0) record, show some response to the major volcanic-«cid events. The influences affecting the S 18 0 record are listed but not discussed.

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