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By Bancroft W. D.

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5: As in Fig. 4 but for Churchill. strong discontinuity at the time of change in the type of ozonesonde used, the tendency for increasing values during the period prior to 1980 is not evident. Also, during the period after 1980 there are not the nearly uniform decreases seen at Resolute and Churchill. In fact, there is no evidence for increasing ozone amounts at either Goose Bay or Edmonton except in the lowest layer at Edmonton after 1980. This increase is primarily a summer and autumn phenomena (JUN-NOV).

Southon, M. A. Barrie, Stratospheric influence on surface air at Alert: evidence from Be7, BelO and 03, Proc. Fall AGU Meeting, EOS, 73 (43),93, 1992. J. T. Merrill and R. Duce, Seasonal estimates of global atmospheric sea salt distributions, 1. Geophys. , 9ID, 1067-1072, 1986. M. R. Leaitch, 1989, Ground-based cirrus clouds in the Arctic, ill Symp. 011 the Role of Clouds in Atmospheric Chemistry alld Global Climate, 324-327, Anaheim California, Amer. Met Soc. BostollMass, 1989. C. C. Schnell, Tropospheric low-level temperature inversions in the Canadian Arctic, Atmosphere-Ocean, 30 (4), in press, 1992.

W. C. J. Crutzen and RA. Rasmussen, Ozone destruction and photochemical reactions at polar sunrise in the lower Arctic atmosphere, Nature, 334, 138-141, 1988. , Arctic air pollution: an overview of current knowledge, Atmos. , 20, 643-663,1986. , The present climate of the Arctic Ocean and possible past and future states, in The Arctic Seas, (Ed Y. , 1989. G. I. , 1987. J. M. Harris, P. Houmere and S. Bauman, PlXE analysis of south pole aerosol, Nuclear Instrumellls And Methods in Physics Research, B22, 241-247, North Holland Amsterdam, 1987.

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Activation by Charcoal by Bancroft W. D.

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