温水池的海洋热量含量调节了海洋与大陆之间的水分传输
Zhimin Jian1, Yue Wang2, Haowen Dang3
1State Key Laboratory of Marine Geology, Tongji University, Shanghai, China. jian@tongji.edu.cn.
Nature
|October 19, 2022
概括
印度-太平洋热池 (IPWP) 的海洋热量含量影响全球气候. 轨道阳光照射变化驱动上海热量含量 (OHC) 的变化,在36万年内放大季风气候周期.
科学领域:
- 古气候学
- 海洋学
- 气候变化
背景情况:
- 印度太平洋热池 (IPWP) 通过水蒸气和潜在的热量释放对全球气候产生重大影响.
- 上海热量含量 (OHC) 与现代气候变化有关,但其长期变化和水气候影响尚未得到充分探索.
研究的目的:
- 在过去的36万年中调查IPWP上层OHC的长期变化.
- 了解IPWP OHC,轨道阳光和季风气候之间的关系.
- 探索海洋-大陆水文循环的机制.
主要方法:
- 结合地化学代理和短暂的气候模拟.
- 在36万年间分析的IPWP上 (0-200m) OHC变化.
- 使用同位素支持的空海合模型.
主要成果:
- 在过去的36万年里,IPWP上方的OHC变化显示出主导的前行和较弱的倾斜周期,与午线阳光倾斜相关.
- 只有30%-40%的OHC增加是由于冰的体积变化.
- 较高的OHC与IPWP表面水氧同位素丰富和东亚降水量减少相关.
结论:
- 由轨道阳光照射驱动的IPWP上方OHC变化,在 precessional时间尺度上放大了海洋-大陆水文周期.
- OHC变化,而不是表面温度,是通过湿度和潜热趋同的这种放大的主要驱动因素.
- 由阳光照射调节的上层OHC和季风变化的合对于轨道时间尺度上的全球水气候调节至关重要.
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