By James S. Clark (auth.), James S. Clark, Hélène Cachier, Johann G. Goldammer, Brian Stocks (eds.)

Biomass burning profoundly impacts atmospheric chemistry, the carbon cycle, and weather and should have performed so for hundreds of thousands of years.
Bringing jointly popular specialists from paleoecology, fireplace ecology, atmospheric chemistry, and natural chemistry, the amount elucidates the function of fireside in the course of worldwide alterations of the previous and destiny. themes lined contain: the characterization of combustion items that happen in sediments, together with char, soot/fly ash, and polycyclic fragrant hydrocarbons; the calibration of those parts opposed to atmospheric measurements from wildland and prescribed fireplace emissions; spatial and temporal styles in combustion emissions at scales of person burns to the globe.

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Ecol Mono 60:135-159 Clark JS (1996) The baseline biomass burning emissions of eastern North America. In Levine JS (ed) Biomass Burning and Global Change (in press) Clark JS, Hussey TC (1996) Estimating the mass flux of charcoal from sediment records: the effect of particle size, morphology, and orientation. The Holocene 6:129-144 Clark JS, Hussey TC, Royall PD (1996a) Presettlement analogs for Quaternary fire regimes in eastern North America. Jof PaleolimnoI16:79-96 Clark JS, Robinson J (1993) Paleoecology of fire.

1 c: Q) ::s tT (I! u.. 01 o. 5 Particle diameter - log(mm) Figure 10. , in review). Separating the signals Although "background" and "local" signals may exist in some charcoal profiles there is sure to be overlap. How might we emphasize these two signals to better separate regional patterns from events occurring nearby? One candidate for background is a simple average of accumulation rates across samples in a core. This "temporal" average tends to be dominated by the many years when no fires occur nearby.

Obviously, some of the record is lost when the peat surface burns. Because particle accumulation rates in lakes of eastern North America (Clark and Royall 1994, 1995, Clark et al. , in review) are higher than expected based on current knowledge of fuel loads, fuel consumption, and emission factors, we suspect that sediments in the centers of lakes (where cores are taken) overestimate particle production. If so, organic peats and soil horizons would be expected to yield lower accumulation rates than lake sediments.

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