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首页> 外文期刊>Paleoceanography >Quantification of factors impacting seawater and calcite delta O-18 during Heinrich Stadials 1 and 4
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Quantification of factors impacting seawater and calcite delta O-18 during Heinrich Stadials 1 and 4

机译：Heinrich Stadals 1和4期间影响海水和方解石三角洲O-18的因素的量化

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摘要

We perform idealized experiments of a Heinrich Stadial using an oxygen-isotope-enabled Earth System Climate Model. Our results compare relatively well with the planktic and benthic delta O-18 records of Heinrich Stadials 1 and 4. We find that changes in surface delta O-18(c) can be equally attributed to the "temperature effect" due to fractionation during calcification; the "circulation and climate effect" due to changes in circulation, precipitation, and evaporation; and the "meltwater effect" due to the addition and subsequent advection of depleted fresh water from continental ice sheets. In contrast, the meltwater effect and circulation and climate effect have only a small impact on benthic delta O-18(c) during the cessation of the Atlantic Meridional Overturning Circulation (AMOC). Significant temperature changes simulated in both the deep Atlantic and Pacific Oceans substantially influence benthic delta 18O(c) during that time. During the AMOC recovery, however, anomalously low delta O-18(w) surface waters are advected to the deep Atlantic, thus generating a large (similar to 0.5 parts per thousand) delta O-18(c) decrease in the deep North Atlantic. This is in contrast to a hypothesis that links such depletion seen in Atlantic sediment cores during the last glacial stadials to deepwater formation caused by brine rejection and sea ice formation.
机译：我们使用启用了氧同位素的地球系统气候模型对Heinrich Stadial进行了理想化的实验。我们的结果与Heinrich Stadials 1和4的浮游三角洲和底栖三角洲O-18记录相比相对较好。我们发现，由于钙化过程中的分馏，表面三角洲O-18（c）的变化同样可以归因于“温度效应”。 ;由于循环，降水和蒸发量变化而产生的“循环和气候效应”;和“融水效应”，这是由于大陆冰原消耗的淡水增加并随后平流所致。相反，在停止大西洋子午向翻转循环（AMOC）的过程中，融水效应以及环流和气候效应对底栖三角洲O-18（c）的影响很小。在此期间，在大西洋深部和太平洋中模拟的明显温度变化极大地影响了底栖三角洲18O（c）。然而，在AMOC回收期间，异常低的O-18（w）地表水被平流到大西洋深处，因此在北大西洋深处产生了大的O-18（c）减少量（约千分之0.5） 。这与一个假设相反，该假设将大西洋末次冰期中大西洋沉积物芯中的这种损耗与盐水排泄和海冰形成引起的深水形成联系起来。

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