Past Carbonate Preservation Events in the Deep Southeast Atlantic Ocean (Cape Basin) and Their Implications for Atlantic Overturning Dynamics and Marine Carbon Cycling

Julia Gottschalk; David A. Hodell; Luke C. Skinner; Simon J. Crowhurst; Samuel L. Jaccard; Christopher Charles

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Past Carbonate Preservation Events in the Deep Southeast Atlantic Ocean (Cape Basin) and Their Implications for Atlantic Overturning Dynamics and Marine Carbon Cycling

机译：通过深度东南大西洋（Cape Basin）的碳酸盐保存事件及其对大西洋推翻动态和海洋碳循环的影响

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Micropaleontological and geochemical analyses reveal distinct millennial-scale increases in carbonate preservation in the deep Southeast Atlantic (Cape Basin) during strong and prolonged Greenland interstadials that are superimposed on long-term (orbital-scale) changes in carbonate burial. These data suggest carbonate oversaturation of the deep Atlantic and a strengthened Atlantic Meridional Overturning Circulation (AMOC) during the most intense Greenland interstadials. However, proxy evidence from outside the Cape Basin indicates that AMOC changes also occurred during weaker and shorter Greenland interstadials. Here we revisit the link between AMOC dynamics and carbonate saturation in the deep Cape Basin over the last 400 kyr (sediment cores TN057-21, TN057-10, and Ocean Drilling Program Site 1089) by reconstructing centennial changes in carbonate preservation using millimeter-scale X-ray fluorescence (XRF) scanning data. We observe close agreement between variations in XRF Ca/Ti, sedimentary carbonate content, and foraminiferal shell fragmentation, reflecting a common control primarily through changing deep water carbonate saturation. We suggest that the high-frequency (suborbital) component of the XRF Ca/Ti records indicates the fast and recurrent redistribution of carbonate ions in the Atlantic basin via the AMOC during both long/strong and short/weak North Atlantic climate anomalies. In contrast, the low-frequency (orbital) XRF Ca/Ti component is interpreted to reflect slow adjustments through carbonate compensation and/or changes in the deep ocean respired carbon content. Our findings emphasize the recurrent influence of rapid AMOC variations on the marine carbonate system during past glacial periods, providing a mechanism for transferring the impacts of North Atlantic climate anomalies to the global carbon cycle via the Southern Ocean.

机译：微燕麦族和地球化学分析揭示了在碳酸盐渣中长期（轨道规模）变化的强大和长时间的格陵兰壁龛中碳酸酯保存中碳酸盐矿产保存中的碳酸盐水平的巨大巨大增加。这些数据建议在最强烈的格陵兰博物馆期间深入大西洋和加强大西洋经典推翻循环（AMOC）的碳酸盐饱和度。但是，来自博物馆外部的代理证据表明，在较弱和更短的格陵兰博物系中也发生了AMOC变化。在这里，我们通过在使用毫米尺度重建碳酸盐保存的百年变化，通过重建百分比的变化，重新审视深斗盆地在深斗盆地（沉积核TN057-21，TN057-10和海洋钻井计划站点1089）中的碳酸盐饱和度之间的联系X射线荧光（XRF）扫描数据。我们观察XRF Ca / Ti，沉积碳酸酯含量和面包素壳碎片变化之间的密切一致，反映了通过改变深水碳酸酯饱和度的常见控制。我们建议XRF CA / TI记录的高频（亚孔）组分表明在长/强和短/弱/弱北大西洋气候异常期间通过AMOC在大西洋盆地中的碳酸盐离子的快速和经常性再分配。相反，低频（轨道）XRF CA / TI组分被解释为反映通过碳酸盐补偿和/或深海呼吸碳含量的变化进行缓慢的调节。我们的研究结果强调了在过去的冰川期间海洋碳酸盐系统的快速变化的反复性影响，提供了一种通过南洋将北大西洋气候异常转移到全球碳周期的影响的机制。

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《Paleoceanography》 |2018年第6期|共21页
作者
Julia Gottschalk; David A. Hodell; Luke C. Skinner; Simon J. Crowhurst; Samuel L. Jaccard; Christopher Charles;
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作者单位

Godwin Laboratory for Palaeoclimate Research Earth Sciences Department University of Cambridge Cambridge UK;

Godwin Laboratory for Palaeoclimate Research Earth Sciences Department University of Cambridge Cambridge UK;

Godwin Laboratory for Palaeoclimate Research Earth Sciences Department University of Cambridge Cambridge UK;

Godwin Laboratory for Palaeoclimate Research Earth Sciences Department University of Cambridge Cambridge UK;

Institute of Geological Sciences and Oeschger Center for Climate Change Research University of Bern Bern Switzerland;

Scripps Institute of Oceanography University of California San Diego La Jolla CA USA;

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原文格式 PDF
正文语种 eng
中图分类海洋学;
关键词
Past Carbonate; Preservation Events; Deep Southeast;

机译：过去的碳酸盐;保存事件;深度深;

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1. Past Carbonate Preservation Events in the Deep Southeast Atlantic Ocean (Cape Basin) and Their Implications for Atlantic Overturning Dynamics and Marine Carbon Cycling [J] . Julia Gottschalk, David A. Hodell, Luke C. Skinner, Paleoceanography . 2018,第6期

机译：通过深度东南大西洋（Cape Basin）的碳酸盐保存事件及其对大西洋推翻动态和海洋碳循环的影响
2. Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11 [J] . Dickson A.J., Leng M.J., Maslin M.A., Paleoceanography . 2010,第3期

机译：海洋同位素第11期期间大西洋翻转环流和Agulhas泄漏对东南大西洋上层海洋水文学的影响
3. New age constraints on Aptian evaporites and carbonates from the South Atlantic: Implications for Oceanic Anoxic Event 1a [J] . Tedeschi Leonardo R., Jenkyns Hugh C., Robinson Stuart A., Geology . 2017,第6期

机译：南大西洋的APTIAN蒸发器和碳酸盐的新时代限制：对海洋缺氧事件1A的影响
4. Relationships between satellite derived oceanic events and the albacore tuna (Thunnus alalunga, Bonaterre 1788) artisanal fishing grounds in the North East Atlantic [C] . J. Coca, A. G. Ramos Remote Sensing of the Ocean and Sea Ice 2004 . 2004

机译：卫星衍生的海洋事件与东北大西洋的长鳍金枪鱼（Thunnus alalunga，Bonaterre 1788）手工捕鱼场之间的关系
5. LATE QUATERNARY GLACIAL CYCLES IN THE BAHAMIAN DEEP BASINS AND IN THE ADJACENT ATLANTIC OCEAN (ARAGONITE, DISSOLUTION). [D] . DROXLER, ANDRE WILLY. 1984

机译：巴哈马深流盆地和大西洋附近的晚第四纪冰川周期（文石，溶解）。
6. Culturally transmitted song exchange between humpback whales (Megaptera novaeangliae) in the southeast Atlantic and southwest Indian Ocean basins [O] . Melinda L. Rekdahl, Ellen C. Garland, Gabriella A. Carvajal, 2018

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7. Past Carbonate Preservation Events in the Deep Southeast Atlantic Ocean (Cape Basin) and Their Implications for Atlantic Overturning Dynamics and Marine Carbon Cycling [O] . Julia Gottschalk, David A. Hodell, Luke C. Skinner, 2018

机译：过去东南大西洋（博物馆）的碳酸盐保存事件及其对大西洋推翻动态和海洋碳循环的影响

Past Carbonate Preservation Events in the Deep Southeast Atlantic Ocean (Cape Basin) and Their Implications for Atlantic Overturning Dynamics and Marine Carbon Cycling

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