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

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. in addition they include an archive of geochemical facts, which may definitely delineate a few of the forcing components that govern weather swap. besides the fact that, our skill to interpret those info is critically curtailed by means of lack of awareness of the approaches governing the move of chemical species from the air to the snow. This publication outlines the capability and difficulties of ice center chemistry and discusses the procedures concerned with air-snow move. It offers the nation of present wisdom and an schedule for destiny research.

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C. (t) Ice C Fim C Ice The reconstruction of an atmospheric record from the concentration versus depth profile gained from ice cores is similar to an odyssey through a labyrinth with many pitfalls ready to slur over enthusiastic students and researchers. The paper focusses on the discussion of three "Earth system parameters": CO 2, H20 2 and HCHO. It tries to show up some of the major difficulties on our odyssey. NATO ASI Series. Vol. 141 Chemical Exchange Between the Atmosphere and Polar Snow Edited by Eric W Wolff and Roger C.

1988] are reported on the right side. In conclusion, it appears that the trend of Hel and HNO, detected in several East Antarctic shallow snow layers does not reflect changes in atmospheric concentrations of these species and represents "post depositional artefacts" which seem to be very efficient in these sites with low snow acculllulation rates. In contrast, no trend of the mean value is detected for these two species in South Pole snow layers. m,2. y(' (eg 8 cm of equivalent water) is large enough to strongly limit post depositional artefacts.

D 1880 Fig. 6 Nitrate time series of the last decades from South Pole (A), Dominian Range (B), Vostok (C) and Dome C (D ). Adapted from Mayewski and Legrand [1990]. A similar trend near the surface has been identified at Vostok for excess chloride as depicted in Figure 7. g' near the surface [Legrand and Delmas, 1984] remained rather unchanged in deeper layers [Kirchner and De lmas, 1988]. s 100 50 100 Fig. 7 Nitrate from Mayewski and Legrand [1990] and excess chloride from De Angelis and Legrand [1995J over the last decades at Vostok.

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