来自中国胡鲁洞穴的高分辨率绝对日期的普莱斯托时代末季风记录
Y J Wang1, H Cheng, R L Edwards
1College of Geography Science, Nanjing Normal University, Nanjing 210097, China.
概括
斯塔拉格米特氧同位素记录显示,东亚季风的强度与过去7.5万年的格陵兰岛温度变化密切相关. 这表明北大西洋和东亚之间存在着联系的气候系统.
科学领域:
- 古气候学 古气候学
- 玩弄他们的科学科学.
- 气候动力学 气候动力学
背景情况:
- 对岩的氧同位素分析为过去的气候条件提供了代理.
- 格陵兰岛的冰芯提供了北半球温度波动的成熟记录.
- 东亚季风 (EAM) 在区域气候和水文学中发挥着关键作用.
研究的目的:
- 研究东亚季风强度与格陵兰岛温度之间的关系.
- 为了比较古气候事件的时间记录在洞穴和冰芯.
- 探索北大西洋气候和EAM动态之间的远程连接.
主要方法:
- 从南京胡鲁洞穴收集的五颗石岩中分析氧同位素比率.
- 使用- (230Th) 的放射测年法来建立时间控制.
- 斯塔拉格米特同位素数据与现有的格陵兰冰芯记录的比较 (例如,格陵兰冰盖项目二 - GISP2).
主要成果:
- 来自Hulu洞穴的斯塔拉格米特氧同位素记录显示与格陵兰冰芯记录有很强的相关性.
- EAM变化的时间,日期为230Th,与GISP2核心的温度变化在现在前11000年至30,000年之间保持一致.
- 这种一致性表明,在研究期间,EAM强度和格陵兰岛的温度在一致性上波动.
结论:
- 该研究表明,北大西洋气候 (用格陵兰岛温度表示) 与东亚季风之间存在显著的合.
- 来自热带海洋的南方热量和湿度传输,即EAM的来源,将这些地理上遥远的气候系统联系起来.
- 这些发现支持古气候重建的可靠性,并突出了全球气候模式的相互联系.
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