Reconstruction of the Gulf Stream from 1940 to the present and correlation with the North Atlantic Oscillation
Reconstruction of the Gulf Stream from 1940 to the present and correlation with the North Atlantic Oscillation
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1940年至今墨西哥湾流的重建及其与北大西洋涛动的相关性
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
A. Barth
中科院分区：
文献类型：
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作者：
Sylvain Watelet;J. Beckers;A. Barth
通过对1940年以来70°~ 50°W范围内的墨西哥湾流路径进行观测重建，研究了墨西哥湾流对北大西洋涛动（NAO）的响应。利用来自世界海洋数据库（WOD）、SeaDataNet、国际海洋探索理事会（ICES）、Hydrobase3和Argo浮标的现场数据，创建了一个包含4000多万条条目的统一数据库。在数据插值变分分析软件（DIVA）中实现的变分逆方法可以生成北大西洋（NA）温度和盐度月度分析的时间序列。利用这些时间序列推导出两个GS指数：代表位置的GS北壁（GSNW）指数和代表其移动的GS三角洲（GSD）指数。研究发现，自1940年以来，GSNW与NAO在1年（NAO早于GS）的滞后期呈显著相关（0.37），GSD与NAO在0年（0.50和0.43）的滞后期呈显著相关（0.50和0.43）。
AbstractIn this study, the Gulf Stream (GS)’s response to the North Atlantic Oscillation (NAO) is investigated by generating an observation-based reconstruction of the GS path between 70° and 50°W since 1940. Using in situ data from the World Ocean Database (WOD), SeaDataNet, International Council for the Exploration of the Sea (ICES), Hydrobase3, and Argo floats, a harmonized database of more than 40 million entries is created. A variational inverse method implemented in the software Data Interpolating Variational Analysis (DIVA) allows the production of time series of monthly analyses of temperature and salinity over the North Atlantic (NA). These time series are used to derive two GS indices: the GS north wall (GSNW) index for position and the GS delta (GSD) index as a proxy of its transport. This study finds a significant correlation (0.37) between the GSNW and the NAO at a lag of 1 year (NAO preceding GS) since 1940 and significant correlations (0.50 and 0.43) between the GSD and the NAO at lags of 0...