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在观测和模型中,Dansgaard-Oeschger事件的格陵兰空间指纹

Christo Buizert¹, Todd A Sowers², Kyle Niezgoda^1,3

¹College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis OR 97331.

Proceedings of the National Academy of Sciences of the United States of America

|October 21, 2024

概括

普莱斯托时代的冰河时代出现了急剧的气候变化,称为Dansgaard-Oeschger (DO) 振荡. 新的冰芯数据显示,亚极旋转的海冰,而不是北欧海,推动了格陵兰的气候变化.

科学领域:

古气候学古气候学
气候动力学气候动力学
地球系统科学地球系统科学

背景情况:

普世冰河时代表现出突然的丹斯加尔德-奥斯格尔 (DO) 气候振荡,作为地球系统临界点的关键例子.
格陵兰岛的冰芯对于理解DO变异性至关重要,但温度变化估计在地理上是有限的.

研究的目的:

使用新的冰芯数据,在格陵兰地区空间描述DO事件的大小.
整合多代理数据和气候模型,以全面了解DO影响.

主要方法:

来自格陵兰南部和东部的校准冰芯同位素记录 (δ15N-N2),以改进当地温度重建.
结合新的同位素数据与现有记录 (δ18O,多过剩,积累率) 进行多代理指纹.
利用同位素支持的气候模型和湿度标记实验来确定DO变化的关键驱动因素.

主要成果:

冬季亚极旋转的海冰变化被确定为对格陵兰岛的DO影响的关键因素,既足够又必要.
格陵兰的DO同位素信号主要由蒸汽来源分布的变化来解释,挑战了传统的场地温度视为δ18O的主要控制点的传统观点.

结论:

该研究提供了一个全面的多代理,数据模型合成格陵兰岛突然的DO气候变化.
亚极旋转中的冬季海冰是格陵兰的DO事件的更重要的驱动因素,而不是以前认为的.

关键词:

在DansgaardOeschger循环的过程中格陵兰岛 - 格陵兰岛是什么?冰芯是冰的核心.古代气候是一种古气候.水的同位素是水的同位素.

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