A Holocene black carbon ice-core record of biomass burning in the Amazon Basin from Illimani, Bolivia

A Holocene black carbon ice-core record of biomass burning in the Amazon Basin from Illimani, Bolivia
复制标题

玻利维亚伊利马尼亚马逊盆地生物质燃烧的全新世黑碳冰芯记录

DOI：
--
复制
发表时间：
2019
期刊：
Climate of the Past
影响因子：
4.3
通讯作者：
M. Schwikowski
M. Schwikowski
中科院分区：
地球科学2区
文献类型：
--
作者：
D. Osmont;M. Sigl;A. Eichler;T. Jenk;M. Schwikowski

文献摘要

被引文献

相似文献

抽象的。亚马逊流域是全球水资源的主要贡献者之一 生物质燃烧排放。然而，区域古火趋势仍然存在 特别不为人知。由于靠近亚马逊盆地，安第斯冰 岩心适合重建南美洲的古火趋势 提高我们对火灾、气候和火灾之间复杂联系的理解 人类。在这里，我们展示了第一个耐火黑碳 (rBC) 冰芯 安第斯山脉的记录作为亚马逊生物质燃烧排放的代表 盆地，源自于 6300 m a.s.l 钻探的冰芯。来自伊利马尼 玻利维亚安第斯山脉的冰川，跨越整个全新世直至 上次冰消是在 13 万年前。 Illimani rBC 记录显示 季节性强，雨季数值低，数值高 在旱季，由于加强生物质燃烧的结合 亚马逊河流域的排放量减少，伊利马尼地区的降水量减少。 重新分析发现显着的正（负）相关性 东部地区气温（降水）数据 玻利维亚和巴西西部的火灾活动频繁。重组BC 长期趋势通过以下方式间接反映区域气候变化： 改变生物质燃烧排放，因为它们表现出更高（更低）的浓度 在暖干（冷湿）时期，与气候一致 例如新仙女木期、8.2 ka事件、全新世 气候最适宜、中世纪温暖期和小冰期。最高的 整个记录的 rBC 浓度发生在全新世气候期间 最佳时间在公元前 7000 年至 3000 年之间，表明这种异常温暖和 干旱期导致了生物质燃烧活动的高水平，这在历史上是前所未有的。 过去 13 万年的背景。最近的 rBC 水平，自公元 1730 年以来不断上升 在气温升高和森林砍伐的背景下，类似于 中世纪温暖时期的那些。没有观察到火灾活动减少 在20世纪，与全球生物质燃烧相矛盾 基于木炭数据的重建。
Abstract. 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.