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在过去的1万年里,太平洋的热量含量
Yair Rosenthal1, Braddock K Linsley, Delia W Oppo
1Institute for Marine and Coastal Sciences and Department of Earth and Planetary Sciences, Rutgers University, 71 Dudley Road, New Brunswick, NJ 08901, USA.
概括
海洋热量含量 (OHC) 显著增加,反映了全球变暖. 沉积物核心揭示了过去的太平洋温度在Holocene Thermal Maximum和中世纪温暖时期比今天要温暖得多.
科学领域:
- 古代海洋学 古代海洋学
- 气候科学 气候科学
- 海洋学 海洋学 海洋学
背景情况:
- 海洋热量含量 (OHC) 和温度的上升是当代全球变暖的关键指标.
- 仪器记录仅涵盖最近几十年,限制了对气候变化的长期理解.
研究的目的:
- 为了重建过去的太平洋温度和过去1万年的OHC变化.
- 为了将古海洋学温度数据与仪器记录进行比较.
主要方法:
- 分析来自太平洋沉积物核心的高分辨率代理记录.
- 重建过去的水体温度.
主要成果:
- 与上个世纪相比,北太平洋和南极洲的中间水分分别在中 Holocene 热极限期间分别比上个世纪更高2.1°C和1.5°C.
- 这些水体在中世纪温暖时期也比小冰河时代和最近几十年更温暖.
- 即使在全球表面温度波动相对较小时,OHC也发生了显著的变化.
结论:
- 过去的海洋温度,特别是OHC,在千年时间尺度上表现出相当大的变化.
- 代理记录为了解当前的海洋变暖趋势及其驱动因素提供了重要的长期背景.
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