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Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean

机译：南太平洋东部沉积氮同位素的晚期第四纪变化

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摘要

We present high-resolution bulk sedimentary delta N-15 data from the southern edge of the present-day oxygen minimum zone of the eastern South Pacific. The record is interpreted as representing changes in water column nitrogen removal during the last 70,000 years. We found significant fluctuations in the isotopic signal that suggest major reorganizations of the oxygen minimum zone at millennial timescales. These fluctuations were not related to other millennial-scale changes like the Northern Hemisphere's Dansgaard-Oeschger climate swings or local changes in primary productivity, so appear to be dictated by the Southern Hemisphere's climate rhythm. This is preliminarily corroborated by an overall agreement between our delta N-15 data and the sedimentary proxy of ice sheet dynamics in Patagonia, which is in turn correlated with surface water properties at the midlatitude subduction region of the eastern South Pacific intermediate waters. Finally, potential implications on late Quaternary changes in atmospheric CO2 concentrations are discussed.
机译：我们提供了来自南太平洋东部现今氧气最小带南部边缘的高分辨率散装沉积三角洲N-15数据。该记录被解释为代表过去70,000年中水柱脱氮的变化。我们在同位素信号中发现了显着的波动，这表明在千禧年的时间尺度上最小氧区的重大重组。这些波动与北半球的Dansgaard-Oeschger气候波动或初级生产力的局部变化等其他千禧年尺度的变化无关，因此似乎由南半球的气候节奏决定。我们的N-15增量数据与巴塔哥尼亚冰盖动力学的沉积特征之间的总体一致初步证实了这一点，而这反过来又与南太平洋东部中间水域中纬度俯冲区的地表水特性有关。最后，讨论了对大气CO2浓度后期第四纪变化的潜在影响。

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