Abstract
The Chemistry of High Elevation Fog (CHEF) programme is operational twelve months a year on two mountains (Mt. Tremblant and Roundtop Mtn.) in Quebec, Canada and for four months on a third mountain (Mt. Epaule), all having maximum elevations of 970 m. Measurements include: fog water chemistry, precipitation chemistry, ozone concentrations and meteorological observations. Field observations indicate that the summit of Roundtop Mtn. is in cloud about 44% of the time. The mountain (above 457 m) has an estimated forest exposure to acidic fog of 105 km2 h y-1, In autumn 1985 the daily median Roundtop summit fog pH was 3.8 (mean 3.7), and the median precipitation pH 4.55 (mean 4.3). At Mt. Tremblant the values were 3.9 (mean 3.8) and 4.3 (mean 4.25) respectively. In spring 1986 the daily median fog pH on Mt. Tremblant was 4.0 (mean 4.0) and the precipitation pH 4.5 (mean 4.4). The NO3 -/SO4 = equivalents ratios in the spring fog water and precipitation were in the 0.4 to 0.5 range with concentrations of NO3 - and SO4 = enhanced by a factor of 5 to 10 in the fog water.
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© 1988 Kluwer Academic Publishers
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Schemenauer, R.S., Schuepp, P.H., Kermasha, S., Cereceda, P. (1988). Measurements of the Properties of High Elevation Fog in Quebec, Canada. In: Unsworth, M.H., Fowler, D. (eds) Acid Deposition at High Elevation Sites. NATO ASI Series, vol 252. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3079-7_19
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DOI: https://doi.org/10.1007/978-94-009-3079-7_19
Publisher Name: Springer, Dordrecht
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