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 switch. additionally they include an archive of geochemical facts, which could definitely delineate a few of the forcing components that govern weather swap. even though, our skill to interpret those info is significantly curtailed via lack of information of the procedures governing the move of chemical species from the air to the snow. This ebook outlines the capability and difficulties of ice center chemistry and discusses the methods fascinated by air-snow move. It offers the kingdom of present wisdom and an schedule for destiny research.
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Extra info for Chemical Exchange Between the Atmosphere and Polar Snow
Atmos Environ 22:317-331 Legrand, M, and Kirchner, S (1988) Polar atmospheric circulation and chemistry of recent (19571983) south polar precipitation. Geophys Res Lett 15: 879-882 Legrand, M, Feniet-Saigne, C, Saltzman, ES, and Germain, C (1991) Ice-core record of oceanic emissions of dimethyl sulphide during the last climate cycle. Nature 350: 144-146 Legrand, M, Feniet-Saigne, C, Saltzman, ES, and Germain, C (l992a) Spatial and temporal variations of methanesulfonic acid and non sea salt sulphate in Antarctic ice.
There are no potential precursors in the ice and their solubility in water is small, so that even liquid extraction systems do work. Next on the list of chemical trace gases to be measured are CO and H2. Because of their low concentrations, experimental difficulties in extracting the gas from the ice in sufficient amounts without affecting the concentration have thus to my knwledge prevented a successful measurements. Looking at our transfer function scheme in establishing the transfer function for stable gases, the major difficulties arises from the last step, transformation within the ice.
53 300+ ' --~--~----~----~+ 250 200 J ~150 0.. ___+ . , -24 o o 0' .......... '. -26 -28 -30 -32 -34 T . --+-----~----~----r__+ WIN, SPRING Figure 3: Phase shift 15 18 0 - H202 SUMMER AUTUMN WIN, in a pit from Dye 3 (from Beer et al.. 1991) The H20 2 lags one or two month behind the 8 18 0 peak (Beer et ai, 1991 , Sigg 1990). In the Siple core, Antarctica, no clear shift between the H20 2 and 8 18 0 summer peak is seen (Sigg, 1990), whereas in the high accumulation core from Law Dome the H20 2 seems to preceed the 15 18 0 signal by approx.
Chemical Exchange Between the Atmosphere and Polar Snow by Eric W. Wolff (auth.), Eric W. Wolff, Roger C. Bales (eds.)