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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >200 000 yr diatom records from Atlantic upwelling sites reveal maximum productivity during LGM and a shift in phytoplankton community structure at 185 000 yr
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200 000 yr diatom records from Atlantic upwelling sites reveal maximum productivity during LGM and a shift in phytoplankton community structure at 185 000 yr

机译：来自大西洋上升流地点的20万年硅藻记录揭示了LGM期间的最大生产力以及185,000年浮游植物群落结构的变化

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摘要

Time series of diatom accumulation rates (DAR) and assemblage composition for the last 200 000 yr from the Atlantic major coastal upwelling loci of the eastern boundary currents and eastern Equator are compared together with independent proxies of export production, to upper ocean productivity and to nutrient concentration and utilization. Fluctuations in DAR are concomitant at all sites and in good correspondence to the other independent productivity proxies indicating glacial periods as the most productive times of the past 200 000 yr in both hemispheres of the eastern Atlantic. Maximum productivity, about one order of magnitude higher than at present, occurred at the last glacial maximum (LGM). Despite the 'Atlantic' similarities in both coastal and equatorial upwelling types, important regional and site specific variations emerge. In the southern Hemisphere site, a contradiction of proxies, diatoms and Corg, is noted at the base of stage 6 (185 000 yr). The good correlation found between the Corg and the benthic foraminifera fluxes is interpreted as a reflection of a shift in the phytoplankton community structure related to either a change in the N:P:Si ratio, or similar nutrient conditions associated with increased water column stratification.
机译：比较了东部边界洋流和赤道东部大西洋主要沿海上升地点的最后20万年的硅藻累积速率（DAR）和组合物的时间序列，以及出口生产，高洋生产力和养分的独立代表。集中和利用。 DAR的波动在所有地点都伴随着，并且与其他独立的生产力指标很好地吻合，表明冰川期是东大西洋两个半球过去20万年中生产力最高的时期。在上一个冰期最高峰（LGM）发生了最大生产力，比目前高出大约一个数量级。尽管沿海和赤道上升流类型都具有“大西洋”相似性，但仍会出现重要的区域和特定地点差异。在南半球遗址，在第6阶段（185,000年）的基础上注意到了代理，硅藻和Corg的矛盾。在Corg和底栖有孔虫通量之间发现的良好相关性被解释为反映了浮游植物群落结构变化的反映，该​​变化与N：P：Si比的变化或与增加水柱分层相关的相似养分状况有关。

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