Download Chemical Exchange Between the Atmosphere and Polar Snow by Eric W. Wolff (auth.), Eric W. Wolff, Roger C. Bales (eds.) PDF

By Eric W. Wolff (auth.), Eric W. Wolff, Roger C. Bales (eds.)

Polar ice cores have supplied great advances in our wisdom of previous weather swap. additionally they include an archive of geochemical facts, which may definitely delineate the various forcing elements that govern weather swap. although, our skill to interpret those info is seriously curtailed by way of lack of awareness of the tactics governing the move of chemical species from the air to the snow. This publication outlines the aptitude and difficulties of ice center chemistry and discusses the methods curious about air-snow move. It supplies the nation of present wisdom and an time table for destiny research.

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Ice caps and glaciers accumulate past precipitation. Cores are intentionally taken from places where a uniform deposition of snow occurs, which allows a good dating of the core. Counting years with seasonally varying parameters and converting depth scales to age scales is an old passion of the ice core community and sometimes a controversial area. Establishment of a depth to age scale is of course a prerequest for the interpretation of any ice core records. For the following discussion, let me assume that such a relation exists and is known.

T l of formate, acetate, nitrate and chloride respectively (Figure 11). g- I for formate, acetate, nitrate and chloride respectively (Figure 11). From these calculations, both riming and co-condensation processes seem able to explain the fresh snow content of HCI, HCOOH, and CH 3COOH. In contrast, for HN0 3, neither of these scenario is consistent with the high nitric acid content of fresh snow. Domine and Thibert [1996] have measured the diffusion coefficient of HCI and HN0 3 in ice at - 15°C, which is close to the mean summer Summit temperature, and found values in the range of lO-12 and 10 10 cm Is, respectively.

To my knowledge no HCHO measurements have been done on an Antarctic core covering the last few hundred years. Again the "Australian" core from Law Dome seems the most promising core material for such an analysis.

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