High-latitude fire activity of recent decades derived from microscopic charcoal and black carbon in Greenland ice cores
High-latitude fire activity of recent decades derived from microscopic charcoal and black carbon in Greenland ice cores
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DOI：
10.1177/09596836221131711
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发表时间：
2022-11
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影响因子：
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通讯作者：
S. Brugger;N. Chellman;C. McConnell;J. McConnell
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作者：
S. Brugger;N. Chellman;C. McConnell;J. McConnell
气温变暖和干旱期延长导致高纬度生态系统火灾频率和强度迅速变化。相关的烟羽存款黑暗的粒子从格陵兰冰盖上的不完全燃烧，减少了二氧化碳，但也提供了一个详细的记录古火灾的历史。在这里，我们将一种新兴的微观木炭技术与现有的黑碳和铅污染测量相结合，应用于最近几十年从格陵兰岛南部到中部的10个冰芯阵列。我们发现，微观木炭沉积是高度可变的网站之间，有几个记录表明最近增加的生物量燃烧可能在北方森林生态系统中不断增长的火灾活动。这与在相同冰芯中测量的黑碳减少趋势形成对比，这与工业化石燃料排放的贡献一致。铅污染的下降趋势和微观球状碳颗粒（SCP），化石燃料排放的微化石示踪剂的发生，进一步支持我们的解释，黑碳在该地区的影响，在最近几十年的工业排放。我们的结论是，冰中的微观木炭分析可能有助于解开生物质燃烧的化石燃料排放在工业时期，并有可能有助于更好地了解区域高纬度火灾制度。
Warming temperatures and prolonged drought periods cause rapid changes of fire frequencies and intensities in high-latitude ecosystems. Associated smoke plumes deposit dark particles from incomplete combustion on the Greenland ice sheet that reduce albedo but also provide a detailed record of paleofire history. Here, we apply an emerging microscopic charcoal technique in combination with established black carbon and lead pollution measurements to an array of 10 ice cores from southern to central Greenland that span recent decades. We found that microscopic charcoal deposition is highly variable among sites, with a few records suggesting recently increasing biomass burning possibly in response to growing fire activity in boreal forest ecosystems. This stands in contrast to decreasing trends in black carbon measured in the same ice cores, consistent with contributions from industrial fossil fuel emissions. Decreasing trends of lead pollution and occurrence of microscopic spheroidal carbonaceous particles (SCP), a microfossil tracer of fossil fuel emissions, further support our interpretation that black carbon in this region is influenced by industrial emissions during recent decades. We conclude that microscopic charcoal analyses in ice may help disentangle biomass burning from fossil-fuel emissions during the industrial period and have potential to contribute to better understanding of regional high-latitude fire regimes.