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Volume 13, issue 4 | Copyright
Clim. Past, 13, 395-410, 2017
https://doi.org/10.5194/cp-13-395-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 20 Apr 2017

Research article | 20 Apr 2017

Aromatic acids in a Eurasian Arctic ice core: a 2600-year proxy record of biomass burning

Mackenzie M. Grieman1, Murat Aydin1, Diedrich Fritzsche2, Joseph R. McConnell3, Thomas Opel2,4, Michael Sigl5, and Eric S. Saltzman1 Mackenzie M. Grieman et al.
  • 1Department of Earth System Science, University of California, Irvine, Irvine, California, 92697-3100, USA
  • 2Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany
  • 3Division of Hydrologic Sciences, Desert Research Institute, Reno, Nevada, USA
  • 4Permafrost Laboratory, Department of Geography, University of Sussex, Brighton, UK
  • 5Laboratory of Environmental Chemistry, Paul Scherrer Institut, Villigen, Switzerland

Abstract. Wildfires and their emissions have significant impacts on ecosystems, climate, atmospheric chemistry, and carbon cycling. Well-dated proxy records are needed to study the long-term climatic controls on biomass burning and the associated climate feedbacks. There is a particular lack of information about long-term biomass burning variations in Siberia, the largest forested area in the Northern Hemisphere. In this study we report analyses of aromatic acids (vanillic and para-hydroxybenzoic acids) over the past 2600 years in the Eurasian Arctic Akademii Nauk ice core. These compounds are aerosol-borne, semi-volatile organic compounds derived from lignin combustion. The analyses were made using ion chromatography with electrospray mass spectrometric detection. The levels of these aromatic acids ranged from below the detection limit (0.01 to 0.05ppb; 1ppb = 1000ngL−1) to about 1ppb, with roughly 30% of the samples above the detection limit. In the preindustrial late Holocene, highly elevated aromatic acid levels are observed during three distinct periods (650–300BCE, 340–660CE, and 1460–1660CE). The timing of the two most recent periods coincides with the episodic pulsing of ice-rafted debris in the North Atlantic known as Bond events and a weakened Asian monsoon, suggesting a link between fires and large-scale climate variability on millennial timescales. Aromatic acid levels also are elevated during the onset of the industrial period from 1780 to 1860CE, but with a different ratio of vanillic and para-hydroxybenzoic acid than is observed during the preindustrial period. This study provides the first millennial-scale record of aromatic acids. This study clearly demonstrates that coherent aromatic acid signals are recorded in polar ice cores that can be used as proxies for past trends in biomass burning.

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Wildfires impact ecosystems, climate, and atmospheric chemistry. Records that predate instrumental records and industrialization are needed to study the climatic controls on biomass burning. In this study, we analyzed organic chemicals produced from burning of plant matter that were preserved in an ice core from the Eurasian Arctic. These chemicals are elevated during three periods that have similar timing to climate variability. This is the first millennial-scale record of these chemicals.
Wildfires impact ecosystems, climate, and atmospheric chemistry. Records that predate...
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