Intercomparison of the Gulf Stream in ocean reanalyses: 1993-2010
Intercomparison of the Gulf Stream in ocean reanalyses: 1993-2010
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DOI：
10.1016/j.ocemod.2018.02.008
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发表时间：
2018-05-01
期刊：
影响因子：
3.2
通讯作者：
Hameed, Sultan
中科院分区：
文献类型：
--
作者：
Chi, Lequan;Wolfe, Christopher L. P.;Hameed, Sultan
近年来，高分辨率海洋再分析产品的开发取得了重大进展。本文比较了从佛罗里达海峡到大滩以南的墨西哥湾流（GS）的各个方面，特别是佛罗里达海峡运输，哈特拉斯角附近的GS分离，夹叶树线（从新泽西到百慕大）沿线的GS属性，GS路径和GS北壁位置，在13种广泛使用的各种分辨率的全球再分析产品中，包括两种无约束产品。发现再分析产品之间存在很大的差异。HYCOM和GLORYS2v4以其卓越的性能在大多数指标中脱颖而出。在所有讨论的模型中都发现了一些共同的偏差；例如，夹竹桃线附近的GS速度结构过于对称，最大速度与观测值相比过于微弱。不到一半的再分析产品与哈特拉斯角的GS分离纬度、GS输运和夹竹树线的净输运的观测结果显示出显著的相关性（在95%的置信水平上）。通过一个理论模型进一步讨论了横流速度结构，该模型将GS理想化为一个平滑的PV锋。
In recent years, significant progress has been made in the development of high-resolution ocean reanalysis products. This paper compares aspects of the Gulf Stream (GS) from the Florida Straits to south of the Grand Banks-particularly Florida Strait transport, separation of the GS near Cape Hatteras, GS properties along the Oleander Line (from New Jersey to Bermuda), GS path, and the GS north wall positions-in 13 widely used global reanalysis products of various resolutions, including two unconstrained products. A large spread across reanalysis products is found. HYCOM and GLORYS2v4 stand out for their superior performance by most metrics. Some common biases are found in all discussed models; for example, the velocity structure of the GS near the Oleander Line is too symmetrical and the maximum velocity is too weak compared with observations. Less than half of the reanalysis products show significant correlations (at the 95% confidence level) with observations for the GS separation latitude at Cape Hatteras, the GS transport, and net transport across Oleander Line. The cross-stream velocity structure is further discussed by a theoretical model idealizing GS as a smoothed PV front.