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首页> 外文期刊>Paleoceanography >Western equatorial Pacific deep water carbonate chemistry during the Last Glacial Maximum and deglaciation: Using planktic foraminiferal Mg/Ca to reconstruct sea surface temperature and seafloor dissolution
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Western equatorial Pacific deep water carbonate chemistry during the Last Glacial Maximum and deglaciation: Using planktic foraminiferal Mg/Ca to reconstruct sea surface temperature and seafloor dissolution

机译：末次冰川最大期和冰消期期间的赤道西太平洋深水碳酸盐化学：使用板状有孔虫Mg / Ca重建海面温度和海底溶解

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摘要

We present a reconstruction of deep-water carbonate saturation state (CO_3~(2-)) in the western equatorial Pacific for the Last Glacial Maximum (LGM) and deglaciation based on changes in the Mg/Ca ratio of planktic foraminifers with increased water depth. Our data suggest there have been changes in bottom water CO_3~(2-) over the past 25,000 years at water depths as shallow as 1.6 km. The CO_3~(2-) reconstruction for the LGM suggests CO_3~(2-) was similar or slightly higher than modern values between 1.6 and 2.0 km, shifting sharply to lower values (an average ～30 mol/kg lower) below 2.5 km. The shift in chemistry between 2.0 and 2.5 km supports a hypothesis that Pacific overturning circulation occurred deeper during the LGM with a slightly more ventilated water mass above 2.0 km. The data are not consistent with enhanced preservation in this region of the deep Pacific at depths greater than 2.5 km, suggesting that the long-held view of better preservation throughout the glacial deep Pacific must be reevaluated. For the deglaciation, we have evidence of a CO _3~(2-) maximum that suggests enhanced deglacial preservation between 1.6 and 4.0 km in comparison to the Holocene and the LGM. The deglacial CO_3~(2-) was as much as 28 mol/kg higher than modern between 1.6 and 4.0 km. Results suggest carbonate burial rates were 1.5 times greater during the deglacial than the over the past 5 kyr.
机译：我们根据浮游有孔虫的镁/钙比随水深的增加而变化，提出了赤道西太平洋最后一次冰期最大值（LGM）和冰消作用下深水碳酸盐饱和状态（CO_3〜（2-））的重建。 。我们的数据表明，在过去的25,000年中，浅水深度为1.6 km时，底水CO_3〜（2-）发生了变化。 LGM的CO_3〜（2-）重建表明，在1.6至2.0 km之间，CO_3〜（2-）与现代值相似或稍高，在2.5 km以下，CO_3〜（2-）急剧向更低的值移动（平均低〜30 mol / kg）。 。化学变化在2.0 km和2.5 km之间，这支持了一个假说，即在LGM期间太平洋倾覆环流发生得更深，而高于2.0 km的通风水量略有增加。数据与深度大于2.5 km的该深太平洋地区的增强保存不一致，这表明必须重新评估长期以来对整个冰川深太平洋更好保存的看法。对于冰消作用，我们有证据表明CO _3〜（2-）最大值表明与全新世和LGM相比，冰期保存增强了1.6至4.0 km。在1.6至4.0 km之间，冰川融化的CO_3〜（2-）比现代高了28 mol / kg。结果表明，冰河时期的碳酸盐埋藏率是过去5年的1.5倍。

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