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在最后的间冰期期间的区域和全球海面温度
Jeremy S Hoffman1, Peter U Clark2, Andrew C Parnell3
1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA. jhoffman@smv.org.
概括
最后一个冰期 (LIG) 的全球海平面比今天高. 峰值LIG海面温度比19世纪晚期高0.5°C,与最近几十年相似.
科学领域:
- 古气候学
- 海洋学
- 气候科学
背景情况:
- 过去的间冰期 (LIG) 的海平面比现在更高.
- 之前的LIG全球温度重建显示出显著的不确定性,估计差异很大.
- 准确的LIG温度数据对于了解过去的气候动态和未来的预测至关重要.
研究的目的:
- 在LIG期间重建区域和全球海面温度 (SST) 的时空变化.
- 解决LIG全球温度估计中的不确定性.
- 调查LIG区域SST变化的驱动因素.
主要方法:
- 使用一个海面温度 (SST) 记录网络.
- 在LIG时期重建的区域和全球SSTs (129到116万年前).
- 分析了北极阳光和双极波动对热带外的SST的影响.
主要成果:
- 峰值LIG全球年均SST比1870年至1889年的平均温度高0.5±0.3°C.
- 全球LIG的SST与1995年至2014年的平均值没有区别.
- 外热带气候变暖是由北极阳光和双极波动驱动的.
- 热带LIG SST的温度略低于1870年至1889年的平均值,这是由于阳光照射的减少.
结论:
- 全球LIG温度仅略高于工业化前时期.
- 在LIG期间的区域SST变化受到不同的气候机制的影响.
- 这项研究提升了我们对LIG气候及其驱动因素的理解.
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