120 Years of AMOC Variability Reconstructed From Observations Using the Bernoulli Inverse
120 Years of AMOC Variability Reconstructed From Observations Using the Bernoulli Inverse
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DOI：
10.1029/2021gl093893
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发表时间：
2021-09-28
影响因子：
5.2
通讯作者：
Cunningham, Stuart A.
中科院分区：
文献类型：
--
作者：
Fraser, Neil J.;Cunningham, Stuart A.
确定大西洋经向翻转环流（AMOC）的长期性质是理解海洋温度强迫的重要一步，对于将最近观察到的AMOC减缓置于气候变化背景下以及预测未来气候都至关重要。我们提出了一个时间序列的AMOC强度在过去的120年，这是完全来自观测。应用伯努利逆水文产生一般地转环流在北大西洋，而不需要额外的海面高度信息，允许AMOC评估在前卫星时代。AMOC在几十年的时间尺度上变化，导致大西洋海表温度的几十年变率（AMV）2.5年。我们认为隐含的AMOC/AMV耦合的动力学，并假设这两个参数的低频变异性是由大规模的密度异常循环在AMOC。
Determining the long-term nature of the Atlantic Meridional Overturning Circulation (AMOC) presents a major step in understanding ocean temperature forcing, and is crucial both for placing the recently observed AMOC slowdown in the context of climate change and for predicting future climate. We present a time series for AMOC strength over the last 120 years which is derived solely from observations. Application of the Bernoulli inverse to hydrography yields the general geostrophic circulation in the North Atlantic without requiring additional sea surface height information, allowing AMOC evaluation in the pre-satellite era. AMOC varies on a multidecadal timescale, leading the Atlantic Multidecadal Variability (AMV) in sea surface temperature by 2.5 years. We consider the dynamics of the implied AMOC/AMV coupling, and hypothesize that the low-frequency variability in both parameters is driven by large-scale density anomalies circulating in the AMOC.