气候变化领域集成服务门户(CCPortal): Vanishing coccolith vital effects with alleviated carbon limitation

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DOI	https://doi.org/10.1594/PANGAEA.861255
	Vanishing coccolith vital effects with alleviated carbon limitation
	Hermoso; Michael; Chan; I Z X; McClelland; H L O; Heureux; AMC; Rickaby; Rosalind E M
发布日期	2016-06-07
数据集类型	dataset
英文关键词	Biomass/Abundance/Elemental composition ; Bottles or small containers/Aquaria ( 20 L) ; Calcidiscus leptoporus ; Chromista ; Coccolithus pelagicus ; Emiliania huxleyi ; Growth/Morphology ; Haptophyta ; Laboratory experiment ; Laboratory strains ; North Atlantic ; Pelagos ; Phytoplankton ; Pleurochrysis placolithoides ; Single species
英文简介	By recreating a range of geologically relevant concentrations of dissolved inorganic carbon (DIC) in the laboratory, we demonstrate that the magnitude of the vital effects in both carbon and oxygen isotopes of coccolith calcite of multiple species relates to ambient DIC concentration. Under high DIC levels, all the examined coccoliths exhibit significantly reduced isotopic offsets from inorganic calcite compared to the substantial vital effects expressed at low (preindustrial and present-day) DIC concentrations. The supply of carbon to the cell exerts a primary control on biological fractionation in coccolith calcite via the modulation of coccolithophore growth rate, cell size and carbon utilisation by photosynthesis and calcification, altogether accounting for the observed interspecific differences between coccolith species. These laboratory observations support the recent hypothesis from field observations that the appearance of interspecific vital effect in coccolithophores coincides with the long-term Neogene decline of atmospheric CO2 concentrations and bring further valuable constraints by demonstrating a convergence of all examined species towards inorganic values at high pCO2 regimes. This study provides palaeoceanographers with a biogeochemical framework that can be utilised to further develop the use of calcareous nannofossils in palaeoceanography to derive sea surface temperature and pCO2 levels, especially during periods of relatively elevated pCO2 concentrations, as they prevailed during most of the Meso-Cenozoic.
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/216835
推荐引用方式 GB/T 7714	Hermoso,Michael,Chan,et al. Vanishing coccolith vital effects with alleviated carbon limitation.2016-06-07.https://doi.org/10.1594/PANGAEA.861255.