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首页> 外文期刊>Paleoceanography >Refining ancient carbon dioxide estimates: Significance of coccolithophore cell size for alkenone-based pCO(2) records
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Refining ancient carbon dioxide estimates: Significance of coccolithophore cell size for alkenone-based pCO(2) records

机译：完善古代二氧化碳估算值：基于烯酮的pCO（2）记录的cococolithophore细胞大小的意义

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摘要

Long-term alkenone-based pCO(2) records are widely applied in paleoclimate evaluations. These pCO2 estimates are based on records of the carbon isotope fractionation that occurs during marine haptophyte photosynthesis (epsilon(p37:2)). In addition to the concentration of aqueous CO2 (CO2( aq)) the magnitude of e epsilon(p37:2): 2 is also influenced by algal growth rates and cell geometry. To date, the influence of haptophyte cell geometry on the expression of ancient e epsilon(p37:2): values has received little attention. This study evaluates changes in cell geometry of ancient alkenone- producing algae at Deep See Drilling Project Site 516 in the southwest Atlantic Ocean by analyzing individual coccolith dimensions, which are proportional to algal cell volume and surface area. We show that during part of the early Miocene, mean cell sizes of alkenone- producing algae were smaller relative to modern Emiliania huxleyi. Cell size variations coincide with significant changes in e epsilon(p37:2): 2, with a distinct 6% decrease in e epsilon(p37:2): at similar to 20.3 Ma associated with a 27% increase in haptophyte cell sizes. These changes in cell size impact e epsilon(p37:2):-based interpretations of growth rate variation and CO2( aq)) estimates for this southwest Atlantic site. After correcting for cell geometry, CO2(aq) estimates at Site 516 are consistent with those reported from other oligotrophic sites during this time, resulting in overall low atmospheric pCO2 estimates (< 350 ppmv) for the early Miocene.
机译：长期基于烯酮的pCO（2）记录被广泛应用于古气候评估。这些pCO2估算值基于海洋触藻植物光合作用过程中发生的碳同位素分馏记录（ε（p37：2））。除了水溶液中的二氧化碳（CO2（aq））浓度外，ε（p37：2）：2的大小还受藻类生长速率和细胞几何形状的影响。迄今为止，触生植物的细胞几何形状对古代ε表达的影响（p37：2）：很少受到关注。这项研究通过分析与藻类细胞体积和表面积成比例的单个可可脂尺寸，评估了西南大西洋深部钻探项目站点516上古代产烯酮的藻类的细胞几何结构变化。我们显示，在中新世早期，相对于现代Emililiania huxleyi，产烯酮的藻类的平均细胞大小较小。细胞大小变化与eepsilon（p37：2）：2的显着变化相符，而e epsilon（p37：2）则明显减少6％：与20.3 Ma相似，触藻植物细胞大小增加27％。这些细胞大小的变化会影响该西南大西洋站点的ε变化（p37：2）：基于增长率的解释和CO2（aq）的估计。在校正了单元的几何形状之后，站点516处的CO2（aq）估算值与此期间的其他贫营养站点报告的估算值相符，导致中新世早期大气pCO2估算值总体较低（<350 ppmv）。

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