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从水文数据改进了全球海洋循环,热传输和混合的估计
1MIT, Cambridge, Massachusetts 02139, USA. ganacho@ifremer.fr
Nature
|December 2, 2000
概括
海洋通过运输热量和营养物质来调节气候. 新的数据和建模揭示了全球海洋循环模式和垂直混合,为气候变化研究提供了关键的参考.
科学领域:
- 海洋学 海洋学 海洋学
- 气候科学 气候科学
- 地质物理学 地质物理学
背景情况:
- 海洋通过热量,淡水和营养物质的运输,在调节全球气候方面发挥着至关重要的作用.
- 了解海洋循环路径,机制和稳定性对于评估当前气候状况和未来变化至关重要.
- 世界海洋循环实验 (WOCE) 最近提供了高质量的全球水文数据,以绘制当前海洋循环的地图.
研究的目的:
- 改进全球海洋循环和热流的估计.
- 解决全球垂直混合在等平面表面.
- 为具有量化不确定性的气候研究建立一个新的参考状态.
主要方法:
- 整合WOCE的高分辨率跨洋水文数据.
- 利用当前的计量器数据,气候风场和生物地化学平衡.
- 应用一个反向模型,改进先验误差估计.
主要成果:
- 全球垂直混合系数在 (3-12) x 10(-4) m2 s(-1) 范围内得到解决.
- 在北大西洋,净深水产量估计为 (15 +/- 12) x 10 ((6) m3 s ((-1).
- 在南大洋,深水净产量估计为 (21 +/- 6) x 10 ((6) m3 s ((-1).
结论:
- 该研究提供了对全球海洋循环和热流的改进估计.
- 这些发现为未来的气候研究提供了一个新的,严格量化的参考状态.
- 已解决的垂直混合和深水生产率提高了我们对海洋在气候调节中的作用的理解.
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