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| Titel |
Fire in ice: two millennia of boreal forest fire history from the Greenland NEEM ice core |
| VerfasserIn |
P. Zennaro, N. Kehrwald, J. R. McConnell, S. Schüpbach, O. J. Maselli, J. Marlon, P. Vallelonga, D. Leuenberger, R. Zangrando, A. Spolaor, M. Borrotti, E. Barbaro, A. Gambaro, C. Barbante |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 10, no. 5 ; Nr. 10, no. 5 (2014-10-29), S.1905-1924 |
| Datensatznummer |
250117063
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| Publikation (Nr.) |
 copernicus.org/cp-10-1905-2014.pdf |
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| Zusammenfassung |
| Biomass burning is a major source of greenhouse gases and influences
regional to global climate. Pre-industrial fire-history records from black
carbon, charcoal and other proxies provide baseline estimates of biomass
burning at local to global scales spanning millennia, and are thus useful to
examine the role of fire in the carbon cycle and climate system. Here we use
the specific biomarker levoglucosan together with black carbon and ammonium
concentrations from the North Greenland Eemian (NEEM) ice cores
(77.49° N, 51.2° W; 2480 m a.s.l) over the past 2000 years
to infer changes in boreal fire activity. Increases in boreal fire activity
over the periods 1000–1300 CE and decreases during 700–900 CE coincide
with high-latitude NH temperature changes. Levoglucosan concentrations in
the NEEM ice cores peak between 1500 and 1700 CE, and most levoglucosan
spikes coincide with the most extensive central and northern Asian droughts
of the past millennium. Many of these multi-annual droughts are caused by
Asian monsoon failures, thus suggesting a connection between low- and high-latitude climate processes. North America is a primary source of biomass
burning aerosols due to its relative proximity to the Greenland Ice Cap.
During major fire events, however, isotopic analyses of dust,
back trajectories and links with levoglucosan peaks and regional drought
reconstructions suggest that Siberia is also an important source of
pyrogenic aerosols to Greenland. |
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