与冰川海洋循环变化的北太平洋淡水事件
E Maier1, X Zhang2, A Abelmann3
1Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany. edith.maier@awi.de.
Nature
|July 12, 2018
概括
北美冰盖的淡水排放影响了北太平洋冰川时期的盐度和温度. 海洋与大气的相互作用调节了这些联系,影响了海因里希时代的气候变化.
科学领域:
- 古代海洋学
- 气候科学
- 冰川时期的动态
背景情况:
- 在冰川时期,淡水偶尔涌入海洋,对海洋循环和气候产生重大影响.
- 北大西洋淡水排放事件与海因里希·斯蒂达尔斯相关,但北太平洋淡水历史仍有争议.
- 了解海因里希时代北太平洋与北大西洋的气候联系对于重建过去的气候变化至关重要.
研究的目的:
- 调查北大西洋循环变化与北太平洋淡水排放之间的联系.
- 为了澄清北太平洋地区在最后一个冰川时期的淡水历史.
- 确定海洋与大气相互作用在北大西洋和北太平洋气候动态的作用.
主要方法:
- 在过去5万年中对藻稳定氧同位素 (δ18O) 的分析,以重建表面海水的δ18O和盐度.
- 检查冰架碎片和海面温度记录.
- 使用同位素支持模型模拟海洋-大气相互作用和淡水排放机制.
主要成果:
- 北太平洋表面海水 δ18O (23‰) 和盐度 (24 PSU) 显著下降在海因里希体育场1和4期间.
- 这些变化与北太平洋东北部的冰碎片增加和海面稍微降温相吻合.
- 东方赤道太平洋的变暖传递了北大西洋信号,在海因里希第1号和第4号冰层中引发了淡水排放.
结论:
- 北大西洋海因里希河流和北太平洋冰层的淡水注入之间存在着强烈的联系.
- 非线性海洋-大气相互作用在调节这些联系方面发挥了复杂的作用.
- 海因里希体育场3的特点是增强背景冷却,与海因里希体育场1和4不同,防止北太平洋变暖并改变淡水排放模式.
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