Very high Middle Miocene surface productivity on the U.S. mid-Atlantic shelf amid glacioeustatic sea level variability

Very high Middle Miocene surface productivity on the U.S. mid-Atlantic shelf amid glacioeustatic sea level variability
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在冰川海平面变化的情况下,美国大西洋中部大陆架的中中新世表面生产力非常高

DOI:
10.1016/j.palaeo.2022.111249
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发表时间:
2022
期刊:
Palaeoecology
影响因子:
--
通讯作者:
Herbert, Timothy D.
Herbert, Timothy D.
中科院分区:
--
文献类型:
--
作者:
Robinson, Marci M.;Dowsett, Harry J.;Herbert, Timothy D.

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中新世气候最适值(MCO)为了解气候系统在高温和大气二氧化碳水平升高下的运行方式提供了重要的见解。尽管MCO对了解区域和全球气候动力学具有重要意义,但北大西洋西部的古温度或古生态记录很少。本文介绍了北大西洋西部,特别是美国马里兰州南部的巴尔的摩天然气和电力(BG&E)海洋沉积物岩心的定量MCO古生态数据。我们研究了烯酮类和浮游有孔虫,并记录了大陆架MCO和中中新世气候转变(MMCT)的第一次海面温度(SST)和生产力估计。浮游有孔虫物种多样性和地表生产力水平的增加伴随着MCO的高海平面间隔,表明沿海上升流。冷却事件与BG&E核的不整合面相关,反映了海平面低洼;这些和沉积旋回将记录与南极冰盖的生长和衰变的偏心速度联系在一起。这一动态记录不仅捕捉了暖暖MMCT期间海温、海平面和沿海生产力的变率,以及MMCT期间全球温度向较冷的转变,而且还显示了在高海平面间隔内和间隔期间当地条件的变率。
The Miocene Climatic Optimum (MCO) provides important insights into how the climate system operates under elevated temperatures and atmospheric CO2levels. Few western North Atlantic paleotemperature or paleoecological records exist from the MCO, despite their importance for understanding both regional and global climate dynamics. Here we present quantitative MCO paleoecological data from the western North Atlantic, specifically from the Baltimore Gas & Electric (BG&E) marine sediment core from southern Maryland, USA. We examine alkenones and planktic foraminifera and document the first sea surface temperature (SST) and productivity estimates for the MCO and the Middle Miocene Climate Transition (MMCT) from the continental shelf. Increased levels of planktic foraminifer species diversity and surface productivity accompany high sea level intervals of the MCO, indicating coastal upwelling. Cooling episodes correlate to unconformities in the BG&E core that reflect sea level lowstands; these and sedimentary cycles tie the record to eccentricity-paced Antarctic ice sheet growth and decay. This dynamic record not only captures the variability in SST, sea level and coastal productivity during the warm MCO and the transition to cooler global temperatures during the MMCT, but it also demonstrates the variability in local conditions within and between intervals of high sea level.
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