气候变化领域集成服务门户(CCPortal): A Holocene black carbon ice-core record of biomass burning in the Amazon Basin from Illimani; Bolivia

CCPortal

DOI	10.5194/cp-15-579-2019
	A Holocene black carbon ice-core record of biomass burning in the Amazon Basin from Illimani; Bolivia
	Osmont D.; Sigl M.; Eichler A.; Jenk T.M.; Schwikowski M.
发表日期	2019
ISSN	18149324
起始页码	579
结束页码	592
卷号	15 期号:2
英文摘要	The Amazon Basin is one of the major contributors to global biomass burning emissions. However, regional paleofire trends remain particularly unknown. Due to their proximity to the Amazon Basin, Andean ice cores are suitable to reconstruct paleofire trends in South America and improve our understanding of the complex linkages between fires, climate and humans. Here we present the first refractory black carbon (rBC) ice-core record from the Andes as a proxy for biomass burning emissions in the Amazon Basin, derived from an ice core drilled at 6300 m a.s.l. from the Illimani glacier in the Bolivian Andes and spanning the entire Holocene back to the last deglaciation 13 000 years ago. The Illimani rBC record displays a strong seasonality with low values during the wet season and high values during the dry season due to the combination of enhanced biomass burning emissions in the Amazon Basin and less precipitation at the Illimani site. Significant positive (negative) correlations were found with reanalyzed temperature (precipitation) data for regions in eastern Bolivia and western Brazil characterized by substantial fire activity. rBC long-term trends indirectly reflect regional climatic variations through changing biomass burning emissions as they show higher (lower) concentrations during warm-dry (cold-wet) periods, in line with climate variations such as the Younger Dryas, the 8.2 ka event, the Holocene Climatic Optimum, the Medieval Warm Period and the Little Ice Age. The highest rBC concentrations of the entire record occurred during the Holocene Climatic Optimum between 7000 and 3000 BCE, suggesting that this exceptionally warm and dry period caused high levels of biomass burning activity, unprecedented in the context of the past 13 000 years. Recent rBC levels, rising since 1730 CE in the context of increasing temperatures and deforestation, are similar to those of the Medieval Warm Period. No decrease in fire activity was observed in the 20th century, in contradiction to global biomass burning reconstructions based on charcoal data. © Author(s) 2019.
语种	英语
scopus关键词	biomass burning; black carbon; climate change; concentration (composition); fire history; historical record; Holocene; ice core; Little Ice Age; long-term change; Medieval Warm Period; nature-society relations; paleoclimate; paleoenvironment; reconstruction; seasonality; trend analysis; Younger Dryas; Amazon Basin; Andes; Bolivia; Illimani; La Paz [Bolivia]
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146837
作者单位	Laboratory of Environmental Chemistry, Paul Scherrer Institute, Villigen, 5232, Switzerland; Oeschger Centre for Climate Change Research, University of Bern, Bern, 3012, Switzerland; Department of Chemistry and Biochemistry, University of Bern, Bern, 3012, Switzerland
推荐引用方式 GB/T 7714	Osmont D.,Sigl M.,Eichler A.,et al. A Holocene black carbon ice-core record of biomass burning in the Amazon Basin from Illimani; Bolivia[J],2019,15(2).
APA	Osmont D.,Sigl M.,Eichler A.,Jenk T.M.,&Schwikowski M..(2019).A Holocene black carbon ice-core record of biomass burning in the Amazon Basin from Illimani; Bolivia.Climate of the Past,15(2).
MLA	Osmont D.,et al."A Holocene black carbon ice-core record of biomass burning in the Amazon Basin from Illimani; Bolivia".Climate of the Past 15.2(2019).