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| DOI | 10.5194/cp-20-1087-2024 |
| A Holocene history of climate, fire, landscape evolution, and human activity in northeastern Iceland | |
| 发表日期 | 2024 |
| ISSN | 1814-9324 |
| EISSN | 1814-9332 |
| 起始页码 | 20 |
| 结束页码 | 4 |
| 卷号 | 20期号:4 |
| 英文摘要 | Paleoclimate reconstructions across Iceland provide a template for past changes in climate across the northern North Atlantic, a crucial region due to its position relative to the global northward heat transport system and its vulnerability to climate change. The roles of orbitally driven summer cooling, volcanism, and human impact as triggers of local environmental changes in the Holocene of Iceland remain debated. While there are indications that human impact may have reduced environmental resilience during late Holocene summer cooling, it is still difficult to resolve to what extent human and natural factors affected Iceland's late Holocene landscape instability. Here, we present a continuous Holocene fire record of northeastern Iceland from proxies archived in St & oacute;ra Vi & eth;arvatn sediment. We use pyrogenic polycyclic aromatic hydrocarbons (pyroPAHs) to trace shifts in fire regimes, paired with continuous biomarker and bulk geochemical records of soil erosion, lake productivity, and human presence. The molecular composition of pyroPAHs and a wind pattern reconstruction indicate a naturally driven fire signal that is mostly regional. Generally low fire frequency during most of the Holocene significantly increased at 3 ka and again after 1.5 ka BP before known human settlement in Iceland. We propose that shifts in vegetation type caused by cooling summers over the past 3 kyr, in addition to changes in atmospheric circulation, such as shifts in North Atlantic Oscillation (NAO) regime, led to increased aridity and biomass flammability. Our results show no evidence of faecal biomarkers associated with human activity during or after human colonisation in the 9th century CE. Instead, faecal biomarkers follow the pattern described by erosional proxies, pointing toward a negligible human presence and/or a diluted signal in the lake's catchment. However, low post-colonisation levels of pyroPAHs, in contrast to an increasing flux of erosional bulk proxies, suggest that farming and animal husbandry may have suppressed fire frequency by reducing the spread and flammability of fire-prone vegetation (e.g. heathlands).Overall, our results describe a fire frequency heavily influenced by long-term changes in climate through the Holocene. They also suggest that human colonisation had contrasting effects on the local environment by lowering its resilience to soil erosion while increasing its resilience to fire. |
| 语种 | 英语 |
| WOS研究方向 | Geology ; Meteorology & Atmospheric Sciences |
| WOS类目 | Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences |
| WOS记录号 | WOS:001225912000001 |
| 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/305781 |
| 作者单位 | University of Colorado System; University of Colorado Boulder; University of Iceland; University of Colorado System; University of Colorado Boulder |
| 推荐引用方式 GB/T 7714 | . A Holocene history of climate, fire, landscape evolution, and human activity in northeastern Iceland[J],2024,20(4). |
| APA | (2024).A Holocene history of climate, fire, landscape evolution, and human activity in northeastern Iceland.CLIMATE OF THE PAST,20(4). |
| MLA | "A Holocene history of climate, fire, landscape evolution, and human activity in northeastern Iceland".CLIMATE OF THE PAST 20.4(2024). |
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