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南西风和南极气候从北方被迫发生突然的冰河时代转移

Christo Buizert¹, Michael Sigl², Mirko Severi³

¹College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA. buizertc@oregonstate.edu.

|November 30, 2018

概括

南半球的西风随着北大西洋气候的突然变化而变化,通过海洋循环和碳交换影响全球气候. 这项研究揭示了南极温度对这些事件的两种反应方式.

科学领域:

古气候学
气候变化
大气科学

背景情况:

南半球西风对全球气候调节至关重要,影响海洋上升,碳循环和冰盖的稳定性.
这些风的假设转移与北大西洋突然气候事件 (丹斯加德-奥斯格尔周期) 的热带汇聚区变化并行.
与这些周期相关的确切大气循环反应和南极温度效应仍未完全理解.

研究的目的:

调查南极温度对丹斯加德-奥斯格尔 (DO) 周期的反应.
澄清南半球大气循环在气候突然变化的作用.
为南半球西风转移及其全球气候影响提供观测证据.

主要方法:

五个冰芯的同步使用火山标记建立一个精确的时间线.
分析南极温度记录和过量以推断过去的气候状况.
观察到的南极温度异常与已知的气候模式比较,如双极波动和南极环形模式.

主要成果:

南极的温度反应包括两个不同的模式:滞后的海洋"双极摇摆"和同步的大气模式.
大气模式的温度异常类似于南方环状模式, 而不是太平洋-南美模式.
南半球西风与北半球气候变化的同步,盆地范围的迁移.

结论:

为了解北半球突然气候变化的南极周边温度变化提出了一个概念框架.
观测证据证实南半球西部风的急剧变化,对全球海洋循环和大气二氧化碳产生重大影响.
这些发现强调了理解Dansgaard-Oeschger周期的全球视角的必要性,而不仅仅是北大西洋的重点.

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