Warm plankton soup and red herrings:Calcareous nannoplankton cellular communities and the Paleocene-Eocene Thermal Maximum
| Autor: | Sarah A. Alvarez, Samantha J. Gibbs, Rosie M. Sheward, Alex J. Poulton, Paul R. Bown |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Geological Phenomena
010504 meteorology & atmospheric sciences Earth Planet General Mathematics Climate Change General Physics and Astronomy chemistry.chemical_element feedback 010502 geochemistry & geophysics 01 natural sciences Atmosphere Calcification Physiologic calcareous nannoplankton 14. Life underwater Biomass Palaeocene–Eocene Thermal Maximum 0105 earth and related environmental sciences Fossils Global warming fungi General Engineering oligotrophic gyres Temperature Biosphere Articles Nutrients Plankton Oceanography shelf chemistry 13. Climate action palaeobiology Carbon isotope excursion Environmental science Carbon Calcareous Research Article |
| Zdroj: | Gibbs, S J, Sheward, R, Bown, P R, Poulton, A J & Alvarez, S 2018, ' Warm plankton soup and red herrings : Calcareous nannoplankton cellular communities and the Paleocene-Eocene Thermal Maximum ', Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, vol. 376, no. 2130, 20170075 . https://doi.org/10.1098/rsta.2017.0075 Philosophical transactions. Series A, Mathematical, physical, and engineering sciences |
| Popis: | 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 CO 2 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’. |
| Databáze: | OpenAIRE |
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