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古新世-始新世极热期野火活动的时空演变
作者:小柯机器人 发布时间:2025/1/8 13:33:10

中国科学院地质与地球物理研究所王旭团队在最新研究中,报道了中国古新世-始新世极热期野火活动的时空演变。该研究于2025年1月6日发表于《中国科学:地球科学》杂志。

据介绍,古新世-始新世极热期(PETM)是新生代最显著的变暖事件,是当前由化石燃料燃烧产生的人为二氧化碳排放驱动的全球变暖的地质模拟。作为地球生态系统的主要破坏者,野火活动影响着生态系统的平衡、全球碳循环和气候变化。因此,研究PETM时期野火的演变及其驱动机制,对于预测全球变暖情景下的野火活动,以及了解野火扰动背景下的碳循环具有重要意义。目前对始新世始新世野火的研究主要集中在北半球,特别是欧洲和北美,在中国大陆的研究还很有限。

本研究通过分析南阳盆地北沟剖面和抚顺盆地西露天剖面的黑碳(BC)和碳同位素浓度(δ13C),重建了干旱/半干旱和湿润地区森林火灾的时空演变。研究人员将这些发现与前人对研究区古气候的研究结果相结合,以阐明野火发生的驱动机制。结果显示,在始新世PETM开始时,南阳盆地野火活动减弱,负碳同位素期野火活动较弱,但在南阳盆地有短暂的复苏。在PETM恢复阶段,野火活动逐渐增加,恢复到PETM前的水平。

此外,持续的低野火状态可能是由极端高温和降水,以及由此产生的植被演替引起的。在PETM恢复阶段,增加的野火活动通过BC的埋藏,将生物-大气碳循环的“短期碳汇”转化为“长期碳汇”。碳汇转化的这一过程可能起到了负反馈机制的作用,有助于碳固存并最终从PETM中恢复。

附:英文原文

Title: Spatiotemporal evolution of wildfire activity during the Paleocene-Eocene Thermal Maximum in China

Author: Xue-Ting WANG, Zuoling CHEN, Linlin CUI, Xu WANG

Issue&Volume: 2025/01/06

Abstract: The Paleocene-Eocene Thermal Maximum (PETM) was the most prominent warming event in the Cenozoic and serves as a geological analog for the current global warming driven by anthropogenic CO2 emissions from burning fossil fuels. As a primary disruptor of Earth’s ecosystems, wildfire activity affects the balance of ecosystems, the global carbon cycle, and climate change. Therefore, studying the evolution and driving mechanisms of wildfires during the PETM is essential for predicting wildfire activity under global warming scenarios and for understanding the carbon cycle in the context of wildfire disturbances. Current research on wildfires during the PETM has mainly focused on the Northern Hemisphere, particularly Europe and North America, whereas studies on Chinese mainland remain limited. In this study, we analyzed black carbon (BC) concentration and carbon isotope (δ13C) in the Beigou section of the Nanyang Basin and the Xilutian section of the Fushun Basin to reconstruct the spatiotemporal evolution of wildfires in arid/semi-arid and humid zones. We integrated these findings with those of previous studies on the paleoclimate of the research area to elucidate the driving mechanisms behind wildfire occurrences. Our results indicate that wildfire activity weakened at the onset of the PETM, with the negative carbon isotope period characterized by low wildfire activity, except for a brief resurgence in the Nanyang Basin. During the recovery phase of the PETM, wildfire activity gradually increased, returning to the pre-PETM levels. The prolonged low wildfire state was likely caused by extremely high temperatures and precipitation as well as the resulting vegetation succession. During the PETM recovery phase, increased wildfire activity transformed “short-term carbon sinks” of the biological-atmospheric carbon cycle into “long-term carbon sinks” through the burial of BC. This process of carbon sink conversion may have acted as a negative feedback mechanism, contributing to carbon sequestration and the eventual recovery from the PETM.

DOI: 10.1007/s11430-024-1472-5

Source: https://www.sciengine.com/10.1007/s11430-024-1472-5

期刊信息

Science China Earth Sciences《中国科学:地球科学》,创刊于1952年。隶属于施普林格·自然出版集团,最新IF:5.7

官方网址:https://www.sciengine.com/SCES/home
投稿链接:https://mc03.manuscriptcentral.com/sces


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