热带十年变化营养供应和植物浮游生物社区在中赤道太平洋在晚期Holocene期间的变化
T P Guilderson1, D S Glynn2, M D McCarthy2
1Ocean Sciences Department, University of California - Santa Cruz, 1156 High Street, Santa Cruz, CA, USA. tguilder@ucsc.edu.
Scientific reports
|February 20, 2024
概括
这项研究使用 (δ15N) 和碳 (δ13C) 同位素重建了2000年的中赤道太平洋 (CEP) 海流. 研究结果显示,植物浮游生物群落的变化与当前的强度变化有关.
科学领域:
- 古海洋学是古海洋学.
- 海洋生物地质化学海洋生物地质化学
- 气候科学 气候科学
背景情况:
- 中央赤道太平洋 (CEP) 的海洋流影响全球气候和生态系统.
- 电流强度的变化,例如北方赤道逆流 (NECC),具有重大影响.
- 了解过去的当前动态对于预测未来的气候和生态变化至关重要.
研究的目的:
- 重建基线 δ15N和 δ13C的出口生产在金曼礁在过去的2000年.
- 分析同位素记录与海洋电流强度 (NECC,SEC,NEC) 之间的关系.
- 调查热带太平洋十年变化 (TPDV) 对这些记录的影响及其与过去气候事件的相关性.
主要方法:
- 从金曼礁的海洋沉积物中重建δ15N和δ13C同位素比率.
- 在过去的2000年中进行了10年以下的分辨率分析.
- 使用厄尔尼诺-拉尼娜动态和TPDV作为数据解释的框架.
主要成果:
- CEP δ15N和 δ13C记录显示多十年 (50-60年) 的变化与TPDV一致.
- 在 δ15N 的一个多世纪的特征与美国西部在中世纪晚期气候异常期间的干旱雨季序列保持一致.
- 同位素数据表明,与NECC强度相关的植物浮游生物群落 (原核生物/小浮游生物与真核生物) 的准可预测的切换.
结论:
- 在晚期Holocene中,NECC的强度变化几乎可以预测.
- 这些变化反映在同位素特征中,影响了植物浮游生物群落结构.
- 这些发现将过去的太平洋当前动态与更广泛的气候模式和生态系统转变联系起来.
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