High-latitude Southern Hemisphere fire history during the mid- to late Holocene (6000-750BP)

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Abstract

<p><strong>Abstract.</strong> We determined the specific biomass burning biomarker levoglucosan in an ice core from the TALos Dome Ice CorE drilling project (TALDICE) during the mid- to late Holocene (6000–750&amp;thinsp;BP). The levoglucosan record is characterized by a long-term increase with higher rates starting at <span class="inline-formula">∼</span>&amp;thinsp;4000&amp;thinsp;BP and peaks between 2500 and 1500&amp;thinsp;BP. The anomalous increase in levoglucosan centered at <span class="inline-formula">∼</span>&amp;thinsp;2000&amp;thinsp;BP is consistent with other Antarctic biomass burning records. Multiple atmospheric phenomena affect the coastal Antarctic Talos Dome drilling site, where the Southern Annular Mode (SAM) is the most prominent as the Southern Annular Mode Index (SAM<span class="inline-formula"><sub>A</sub></span>) correlates with stable isotopes in precipitation throughout the most recent 1000 years of the ice core. If this connection remains throughout the mid- to late Holocene, then our results demonstrate that changes in biomass burning, rather than changes in atmospheric transport, are the major influence on the TALDICE levoglucosan record. Comparisons with charcoal syntheses help evaluate fire sources, showing a greater contribution from southern South American fires than from Australian biomass burning. The levoglucosan peak centered at <span class="inline-formula">∼</span>&amp;thinsp;2000&amp;thinsp;BP occurs during a cool period throughout the Southern Hemisphere, yet during a time of increased fire activity in both northern and southern Patagonia. This peak in biomass burning is influenced by increased vegetation in southern South America from a preceding humid period, in which the vegetation desiccated during the following cool, dry period. The Talos Dome ice core record from 6000 to <span class="inline-formula">∼</span>&amp;thinsp;750&amp;thinsp;BP currently does not provide clear evidence that the fire record may be strongly affected by anthropogenic activities during the mid- to late Holocene, although we cannot exclude at least a partial influence.</p>

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APA

Battistel, D., Kehrwald, N. M., Zennaro, P., Pellegrino, G., Barbaro, E., Zangrando, R., … Barbante, C. (2018). High-latitude Southern Hemisphere fire history during the mid- to late Holocene (6000-750BP). Climate of the Past, 14(6), 871–886. https://doi.org/10.5194/cp-14-871-2018

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