Spatially calibrating polycyclic aromatic hydrocarbons (PAHs) as proxies of area burned by vegetation fires: Insights from comparisons of historical data and sedimentary PAH fluxes

Vachula, Richard S.; Karp, Allison T.; Denis, Elizabeth H.; Balascio, Nicholas L.; Canuel, Elizabeth A.; Huang, Yongsong

doi:10.1016/j.palaeo.2022.110995

Spatially calibrating polycyclic aromatic hydrocarbons (PAHs) as proxies of area burned by vegetation fires: Insights from comparisons of historical data and sedimentary PAH fluxes

Journal Article · Thu Apr 14 00:00:00 EDT 2022 · Palaeogeography, Palaeoclimatology, Palaeoecology

DOI:https://doi.org/10.1016/j.palaeo.2022.110995· OSTI ID:1868031

Vachula, Richard S. ^[1]; Karp, Allison T. ^[2]; ^[3]; Balascio, Nicholas L. ^[4]; Canuel, Elizabeth A. ^[5]; Huang, Yongsong ^[6]

College of William and Mary, Williamsburg, VA (United States); College of William and Mary, Williamsburg, VA (United States). Virginia Inst. of Marine Science; Auburn Univ., AL (United States)
Yale Univ., New Haven, CT (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
College of William and Mary, Williamsburg, VA (United States)
College of William and Mary, Williamsburg, VA (United States). Virginia Inst. of Marine Science
Brown Univ., Providence, RI (United States)

Many regions worldwide have experienced increasing wildfire activity in recent years and climate changes are predicted to result in more frequent and severe fires. Reconstruction of past fire activity offers paleoenvironmental context for modern and future burning. Pyrogenic polycyclic aromatic hydrocarbons (PAHs) have been increasingly used as a molecular biomarker for fire occurrence in the paleorecord and offer opportunity for nuanced reconstructions of fire characteristics. A suite of PAHs are produced during combustion, and the emission amount and assemblage is influenced by many variables including fuel type, fire temperature, and oxygen availability. Despite recent advances in understanding the controls and taphonomy of these biomass burning markers, the spatial scale of this proxy is unknown. In this paper, measurements of PAH fluxes preserved in a lake sediment archive from the Sierra Nevada, California were compared with a historical geographic information system dataset of area burned up to 150 km distance from the lake to determine the spatial scales for which these biomarkers are reliable proxies of burning. Comparisons of PAH fluxes with charcoal accumulation rates in the same sediments suggest that pyrogenic particulate transport modulates low to mid-molecular weight PAHs via adsorption. Overall, the results indicate that PAH records integrate a combination of spatial signals of area burned and measurement of individual PAHs may enable cross-scale paleofire reconstructions.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1868031

Report Number(s):: PNNL-SA-166890

Journal Information:: Palaeogeography, Palaeoclimatology, Palaeoecology, Journal Name: Palaeogeography, Palaeoclimatology, Palaeoecology Vol. 596; ISSN 0031-0182

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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54 ENVIRONMENTAL SCIENCES
Geographic Information System
biomarker
calibration
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fire
paleofire
polycyclic aromatic hydrocarbons
proxy

Spatially calibrating polycyclic aromatic hydrocarbons (PAHs) as proxies of area burned by vegetation fires: Insights from comparisons of historical data and sedimentary PAH fluxes

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