Warm plankton soup and red herrings: calcareous nannoplankton cellular communities and the Palaeocene-Eocene Thermal Maximum.
Warm plankton soup and red herrings: calcareous nannoplankton cellular communities and the Palaeocene-Eocene Thermal Maximum.
复制标题
温暖的浮游生物汤和红色鲱鱼：钙质的Nannoplankton细胞群落和古新世 - 欧新新世的热量最大。
DOI：
10.1098/rsta.2017.0075
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发表时间：
2018-10-13
期刊：
影响因子：
--
通讯作者：
Alvarez SA
中科院分区：
文献类型：
--
作者：
Gibbs SJ;Sheward RM;Bown PR;Poulton AJ;Alvarez SA
过去的全球变暖事件，如古新世-始新世热极大期（PETM-56 Ma），归因于大量碳释放到海洋、大气和生物圈，而恢复归因于硅酸盐风化和有机碳埋藏的结合。浮游植物纳米浮游生物是有机碳和无机碳的主要贡献者，但它们在这一恢复过程中的作用仍然知之甚少，并且由于它们对海洋钙化的贡献而变得复杂。生物钙化不仅涉及长期碳埋藏，还涉及与海水缓冲和海洋酸化响应相关的短期正、负气候反馈。在此，我们利用保存的化石球球的特殊记录，重建了三个不同的纳米浮游生物群落（Bass河-外陆架，Maud上升-最上层深海，Shatsky上升-开阔海洋）在PETM开始和恢复过程中的细胞大小分布、生物量（颗粒有机碳，POC）和（颗粒）无机碳（PIC）产量。每个样地的群落响应随其分类组成和群落总生物量的变化而变化。我们的研究结果表明，纳米浮游生物PIC:POC在短期气候反馈中没有作用，因此，它们作为环境二氧化碳来源的重要性是转移注意力的。然而，特别是在陆架位置向更多的小细胞转移可能导致更高的碳转移效率，并且在PETM恢复期间，浮游生物的生产力和跨陆架的出口对碳固存具有显著的调节作用。这篇文章是讨论会议“超级热：我们地质历史上快速和极端的全球变暖”的一部分。
Past global warming events such as the Palaeocene–Eocene Thermal Maximum (PETM—56 Ma) are attributed to the release of vast amounts of carbon into the ocean, atmosphere and biosphere with recovery ascribed to a combination of silicate weathering and organic carbon burial. The phytoplanktonic nannoplankton are major contributors of organic and inorganic carbon but their role in this recovery process remains poorly understood and complicated by their contribution to marine calcification. Biocalcification is implicated not only in long-term carbon burial but also both short-term positive and negative climatic feedbacks associated with seawater buffering and responses to ocean acidification. Here, we use exceptional records of preserved fossil coccospheres to reconstruct cell size distribution, biomass production (particulate organic carbon, POC) and (particulate) inorganic carbon (PIC) yields of three contrasting nannoplankton communities (Bass River—outer shelf, Maud Rise—uppermost bathyal, Shatsky Rise—open ocean) through the PETM onset and recovery. Each of the sites shows contrasting community responses across the PETM as a function of their taxic composition and total community biomass. Our results indicate that nannoplankton PIC:POC had no role in short-term climate feedback and, as such, their importance as a source of CO2 to the environment is a red herring. It is nevertheless likely that shifts to greater numbers of smaller cells at the shelf site in particular led to greater carbon transfer efficiency, and that nannoplankton productivity and export across the shelves had a significant modulating effect on carbon sequestration during the PETM recovery. This article is part of a discussion meeting issue ‘Hyperthermals: rapid and extreme global warming in our geological past’.
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影响因子：
--
作者：
Bralower, TJ
通讯作者：
Bralower, TJ
影响因子：
5.3
作者：
Gibbs, Samantha J.;Stoll, Heather M.;Bralower, Timothy J.
通讯作者：
Bralower, Timothy J.
影响因子：
--
作者：
Kelly, DC;Zachos, JC;Schellenberg, SA
通讯作者：
Schellenberg, SA
影响因子：
64.8
作者：
Davies, Andrew;Kemp, Alan E. S.;Pike, Jennifer
通讯作者：
Pike, Jennifer
影响因子：
--
作者：
Bralower, Timothy J.;Self-Trail, Jean M.
通讯作者：
Self-Trail, Jean M.