The influence of past variations in water column denitrification (WCD) in the eastern tropical Pacific (ETP) on the western tropical Pacific (WTP) remains ambiguous, due to the deficiency of enough down-core records of nitrogen isotope (δ 15 N) in the WTP. In this study, sedimentary δ 15 N record down a core from the northern WTP is investigated to revisit this issue. After elucidating the potential presence of multiple forms of N by analyzing bulk parameters and the potential occurrence of alteration by examining amino acids, the bulk sedimentary δ 15 N can be accepted as an available indicator of nitrate δ 15 N. Further, a comprehensive comparison of δ 15 N records in the North Pacific reveals largely similar variations from the last glacial maximum to early Holocene, suggesting a common feature of WCD signals associated with basin-scale processes, likely as a consequence of basin-wide ocean circulations. Our result suggests that the signals of local N 2 fixation in the western Pacific marginal seas would have been constrained by a synchronous glacial-interglacial change of the source WCD signals.

中文翻译：

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与上次冰消期东热带反硝化作用有关的热带西太平洋氮同位素沉积记录

过去热带太平洋东部 (ETP) 水柱反硝化 (WCD) 的变化对热带太平洋西部 (WTP) 的影响仍然不明确，原因是缺乏足够的氮同位素 (δ 15 N) 下核记录。支付宝。在这项研究中，研究了从北部水厂的岩心向下记录的沉积 δ 15 N 以重新审视这个问题。在通过分析大量参数阐明了多种形式 N 的潜在存在和通过检查氨基酸可能发生的改变后，大量沉积 δ 15 N 可以被接受为硝酸盐 δ 15 N 的可用指标。此外，综合比较北太平洋的 δ 15 N 记录揭示了从末次盛冰期到全新世早期的大致相似的变化，表明与盆地尺度过程相关的 WCD 信号的一个共同特征，可能是整个盆地海洋环流的结果。我们的结果表明，西太平洋边缘海的局部 N 2 固定信号会受到源 WCD 信号的同步冰期-间冰期变化的限制。