Terrestrial environmental change across the onset of the PETM and the associated impact on biomarker proxies: A cautionary tale

Terrestrial environmental change across the onset of the PETM and the associated impact on biomarker proxies: A cautionary tale
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PETM 爆发期间的陆地环境变化及其对生物标志物代理的相关影响:一个警示故事

DOI:
10.1016/j.gloplacha.2019.102991
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发表时间:
2019
影响因子:
3.9
通讯作者:
Inglis G
Inglis G
中科院分区:
地球科学1区
文献类型:
--
作者:
Inglis G

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古新世-始新世热峰期(PETM,约5600万年前)是新生代最严重的碳循环扰动事件。虽然PETM与地表(高达8 °C)和深海(高达5 °C)的变暖有关,但从这个间隔开始的陆地温度估计相对较少。在PETM期间的水文循环的相关响应也很难约束。在这里,我们使用生物标志物代理(通知模型)重建温度和水文变化的Cobham褐煤(英国)在最新的古新世和早期PETM。先前在这个地点的工作表明,在最晚的古新世(约2000年)温暖的地球温度。22-26 °C)。然而,生物标志物温度代理意味着在PETM开始期间的冷却(约。5-11°C冷却),与其他地方,区域和全球证据不一致。这与pH值的增加相一致(约。2个pH值单位,pH值>7),增加了内涝,火灾大幅减少,泥炭地环境中开放水域的发展。水文和环境的这种深刻变化明显地使生物标志物温度代用指标产生偏差,包括分支GDGT古温度计。这是一个警示故事,说明在没有更广泛地了解其环境背景的情况下,试图解释生物标志物代用记录的危险。
The Paleocene-Eocene Thermal Maximum (PETM; ~ 56 million years ago) is the most severe carbon cycle perturbation event of the Cenozoic. Although the PETM is associated with warming in both the surface (up to 8 °C) and deep ocean (up to 5 °C), there are relatively few terrestrial temperature estimates from the onset of this interval. The associated response of the hydrological cycle during the PETM is also poorly constrained. Here, we use biomarker proxies (informed by models) to reconstruct temperature and hydrological change within the Cobham Lignite (UK) during the latest Paleocene and early PETM. Previous work at this site indicates warm terrestrial temperatures during the very latest Paleocene (ca. 22–26 °C). However, biomarker temperature proxies imply cooling during the onset of the PETM (ca. 5–11 °C cooling), inconsistent with other local, regional and global evidence. This coincides with an increase in pH (ca. 2 pH units with pH values >7), enhanced waterlogging, a major reduction in fires and the development of areas of open water within a peatland environment. This profound change in hydrology and environment evidently biases biomarker temperature proxies, including the branched GDGT paleothermometer. This serves as a cautionary tale on the danger of attempting to interpret biomarker proxy records without a wider understanding of their environmental context.
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