大西洋南部翻转循环在北北 26.5 度的时间变化
Stuart A Cunningham1, Torsten Kanzow, Darren Rayner
1National Oceanography Centre, Empress Dock, Southampton SO14 3ZH, UK. scu@noc.soton.ac.uk
概括
大西洋南部翻转循环 (MOC) 显示出明显的年比年变化,平均为18.7 Sv. 持续的测量揭示了其年内变化,这对于了解气候变化影响至关重要.
科学领域:
- 海洋学 海洋学 海洋学
- 气候科学 气候科学
- 物理海洋学 物理海洋学
背景情况:
- 大西洋南部翻转循环 (MOC) 对全球气候调节至关重要.
- 人们认识到MOC对全球变暖的脆弱性,但其短期变异性仍然不明确.
- 以前的MOC变化评估依赖于稀疏的数据,限制了十年级气候变化推断.
研究的目的:
- 量化大西洋MOC的年内变化.
- 建立一个高分辨率的监控能力,对MOC年间变化进行监控.
主要方法:
- 自2004年以来,利用了来自快速气候变化 (RAPID) 阵列的连续MOC测量.
- 来自海湾流运输和地表层Ekman运输时间序列的综合数据.
- 沿 26.5 度北角部署了停泊仪器,用于跨大西洋的 MOC 评估.
主要成果:
- 年平均MOC强度被确定为18.7 ± 5.6 sverdrups (Sv).
- 观察到的MOC流量发生了显著的变化,从4.0到34.9 Sv.
- 证明了跨年MOC变化可以以1.5SV的精度监测.
结论:
- 持续的MOC监测为其短期变化提供了前所未有的洞察力.
- 了解MOC的动态范围对于准确的气候变化影响评估至关重要.
- 快速阵列使MOC波动的可靠跟踪成为气候建模的关键.
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