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Boreal blazes: Biomass burning and vegetation types archived in the Juneau Icefield

Environmental Research Letters
By: , and 

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Abstract

The past decade includes some of the most extensive boreal forest fires in the historical record. Warming temperatures, changing precipitation patterns, the desiccation of thick organic soil layers, and increased ignition from lightning all contribute to a combustive combination. Smoke aerosols travel thousands of kilometers, before blanketing the surfaces on which they fall, such as the Juneau Icefield. However, many aerosols found in smoke plumes are also produced by other processes and therefore can be ambiguous indicators of fire activity. Here, we use the monosaccharide anhydrides levoglucosan, mannosan, and galactosan as specific indicators of biomass burning to unambiguously demonstrate that fire aerosols reach the Juneau Icefield and are integrated into the snowpack. Back trajectories and satellite observations demonstrate that smoke plumes originating in central Alaska and eastern Siberia affect the Juneau Icefield. These regional sources of fire differ from other combustion aerosols deposited on the Juneau Icefield, such as black carbon, that originate from local fossil fuel burning. Ratios of levoglucosan/mannosan (L/M) and levoglucosan/(mannosan + galactosan) (L/(M + G)) demonstrate that while the majority of fire aerosols reaching the Juneau Icefield originate from softwood burning, grasslands and hardwood forests are also sources. The presence of these hardwoods suggests that fire aerosols may reach the Juneau Icefield from locations as far away as East Asia.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Boreal blazes: Biomass burning and vegetation types archived in the Juneau Icefield
Series title Environmental Research Letters
DOI 10.1088/1748-9326/ab8fd2
Volume 15
Issue 8
Year Published 2020
Language English
Publisher IOP Science
Contributing office(s) Geosciences and Environmental Change Science Center, Toxic Substances Hydrology Program, WMA - Earth System Processes Division
Description 085005, 15 p.
Country United States
State Alaska
Other Geospatial Juneau icefield
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