在最后一次终结期间,北大西洋和日本的异步气候变化
Takeshi Nakagawa1, Hiroyuki Kitagawa, Yoshinori Yasuda
1International Research Center for Japanese Studies, 3-2 Oeyama-cho, Goryo, Nishikyo-ku, Kyoto 610-1192, Japan. nakagawa@mail.dotcom.fr
概括
来自日本的花粉记录揭示了"最后的终结"期间的气候变化. 与北大西洋相比,远东的气候变化表现出独特的时机,受到太阳辐射和大西洋因素的影响.
科学领域:
- 古气候学 古气候学
- 古海洋学是古海洋学.
- 沉积物学的沉积物学
背景情况:
- 最后的终止 (大约. 19,00011,700年前) 是一个显著的全球气候变化时期.
- 了解这个过渡时期的区域气候动态对于重建过去的气候变化至关重要.
- 湖泊沉积物核心提供了过去环境条件的高分辨率档案.
研究的目的:
- 为了重建远东的古气候在最后的终止使用每年分层的湖泊沉积物.
- 将日本的气候事件的时间和性质与北大西洋地区的气候事件进行比较.
- 在此期间调查远东气候变化的驱动因素.
主要方法:
- 分析来自日本苏江湖的每年层层沉积物核心.日本.
- 对花粉进行分析,以重建植被和气候变化.
- 放射性碳测年法,以建立一个时间框架.
主要成果:
- 花粉记录表明,在日本的最后一次终结期间,气候序列部分反映了北大西洋模式,但有明显的时间差异.
- 日本的早期阶段间变暖发生在北大西洋GI-1 (Bölling) 事件发生前几个世纪.
- 在日本,一个类似于新干 (YD) 的寒冷时期发生在北大西洋GS-1 (YD) 事件发生后的几个世纪.
结论:
- 在最后的终结期间,远东地区的气候动态受到北大西洋气候强迫和区域因素的影响,包括太阳辐射.
- 时间上的差异凸显了在脱冰过程中全球气候反应的复杂性和不均性.
- 苏格特苏湖沉积物为了解东亚古气候提供了宝贵的档案.
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