Historical biomass burning: Late 19th century pioneer agriculture revolution in northern hemisphere ice core data and its atmospheric interpretation

Autor: Petr Chylek, B. L. Deck, Gerald Holdsworth, Martin Wahlen, Paul Andrew Mayewski, Bruce D. Johnson, Gregory A. Zielinski, K. Higuchi, Peter Damiano
Rok vydání: 1996
Předmět:
Zdroj: Journal of Geophysical Research: Atmospheres. 101:23317-23334
ISSN: 0148-0227
DOI: 10.1029/96jd01158
Popis: Ice core data from Yukon and Greenland spanning from ∼1750 to 1950 indicate that between ∼1850 and ≤1910 a clear atmospheric signal exists of an episodic biomass burning event that is referred to as the Pioneer Agriculture Revolution. This is best seen in NH 4 + ion and particulate concentrations but also in some limited black carbon concentration data, where for all three quantities maximum levels reach about 3 times the prerevolution background concentrations. Tree cellulose δ 13 C data and some early, controversial, French, air CO 2 data, occurring within the same time interval, are interpreted as providing other independent evidence for the same, mainly North American, late 19th century biomass burning event. Some hitherto problematic northern hemisphere ice core derived CO 2 concentration data may now be interpreted as containing a biomass burn signal, and these data are compared, especially as to the time of occurrence, with all the other results. A global carbon cycle model simulation of atmospheric CO 2 mixing ratios using a maximum input of 3 Gt(C)/yr at northern midlatitudes produces anomalous CO 2 levels close to some of the ice core carbon dioxide values. However, other values in this data set do not reasonably represent fully mixed atmospheric values. This suggests that these values might be transients but still tracers for biomass burning. Nevertheless, it appears possible that interhemispheric CO 2 gradients of similar magnitude to the present one could have existed briefly late last century.
Databáze: OpenAIRE
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