Scaled biotic disruption during early Eocene global warming events
Scaled biotic disruption during early Eocene global warming events
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DOI：
10.5194/bg-9-4679-2012
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发表时间：
2012-01-01
期刊：
影响因子：
4.9
通讯作者：
Zachos, J. C.
中科院分区：
文献类型：
--
作者：
Gibbs, S. J.;Bown, P. R.;Zachos, J. C.
古新世晚期和始新世早期的高温是与全球碳循环的大规模扰动相关的短暂变暖事件，被认为是当前人为气候变化的部分类似物。由于不同事件的碳释放量各不相同，因此它们是探索碳循环扰动、气候变化和生物反应之间关系的理想自然实验。在这里，我们量化了始新世早期三百万年的海洋生物变异性，其中包括五次高温，利用一种方法，使我们能够通过从背景到主要灭绝事件的场景整合不同浮游生物群的记录。我们的长期钙质超小型浮游生物记录表明，生物破坏对气候变化的影响与各种高温期间释放的碳量有关。重要的是，只有三个最大的高温事件，即古新世-始新世最热事件 (PETM)、始新世最热事件 2 (ETM2) 和 I1 事件，显示出高于背景的方差，这表明碳输入的幅度和相关的气候变化需要超过阈值才能造成严重的生物破坏。
Late Paleocene and early Eocene hyperthermals are transient warming events associated with massive perturbations of the global carbon cycle, and are considered partial analogues for current anthropogenic climate change. Because the magnitude of carbon release varied between the events, they are natural experiments ideal for exploring the relationship between carbon cycle perturbations, climate change and biotic response. Here we quantify marine biotic variability through three million years of the early Eocene that include five hyperthermals, utilizing a method that allows us to integrate the records of different plankton groups through scenarios ranging from background to major extinction events. Our long time-series calcareous nannoplankton record indicates a scaling of biotic disruption to climate change associated with the amount of carbon released during the various hyperthermals. Critically, only the three largest hyperthermals, the Paleocene-Eocene Thermal Maximum (PETM), Eocene Thermal Maximum 2 (ETM2) and the I1 event, show above-background variance, suggesting that the magnitude of carbon input and associated climate change needs to surpass a threshold value to cause significant biotic disruption.