晚四级赤道太平洋海洋表面温度变化对气候的影响
1Department of Geological Sciences and Marine Science Institute, University of California, Santa Barbara, CA 93106, USA. Department of Geology, University of California, Davis, CA 95616, USA.
Science (New York, N.Y.)
|September 8, 2000
概括
热带太平洋海面温度在冰河时代变冷,影响了全球气候. 这项研究揭示了与南极温度和大陆冰体积变化相关的显著降温.
科学领域:
- 古海洋学是古海洋学.
- 气候科学 气候科学
- 海洋地质 海洋地质学
背景情况:
- 了解过去的气候变化对于预测未来的气候变化至关重要.
- 热带海面温度 (SST) 在调节全球气候中的作用,特别是在冰川-冰川间周期期间,仍然是活跃的研究领域.
研究的目的:
- 为了重建热带太平洋海面温度 (SSTs) 在最后的冰川最大和之前的冰川-冰川间时期.
- 为了研究热带太平洋SST,南极空气温度和大陆冰体积之间的关系.
- 评估在冰川时期赤道太平洋区域SST梯度和水蒸气运输的变化.
主要方法:
- 在赤道太平洋沉积芯中的浮游生物类植物中分析/和氧同位素数据.
- 使用地球化学代理来重建过去的海面温度 (SST).
- 从地化学数据中提取盐度代理值.
主要成果:
- 热带太平洋的SSTs比最后一个冰川最大时代的温度低2.8±0.7°C.
- 在过去的45万年中,冰川和冰川间的温度差异高达5°C.
- 热带冷却在大陆冰体积的变化之前大约有3000年.
- 在冰川时期,赤道太平洋区域SST梯度类似或更大.
- 增强的水蒸气运输到西太平洋发生在冰川时期.
结论:
- 热带太平洋的冷却在推动冰河时代气候动态方面发挥了重要作用.
- 热带SST的变化与南极气候变化密切相关.
- 这些发现提供了关于过去气候转型期间海洋-大气相互作用和水文循环变化的见解.
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