Wind-driven coastal-trapped waves off southern Tamaulipas and northern Veracruz, western Gulf of Mexico, during winter 2012-2013

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• 作者：David Rivas ^{drivas@cicese.mx}
• 关键词：Coastal mooring observations ; Western Gulf of Mexico ; Near-coastal variability ; CTW model
• 刊名：Estuarine, Coastal and Shelf Science
• 出版年：2017
• 出版时间：5 February 2017
• 年：2017
• 卷：185
• 期：Complete
• 页码：1-10
• 全文大小：2677 K
• 卷排序：185

文摘

Four months of observations from a near-coastal mooring, deployed off southern Tamaulipas-northern Veracruz coast (western Gulf of Mexico) during winter 2012–2013, provide velocity and pressure series in a coastal region where apparently no in-situ measurements have been formally reported. The observations show numerous events of intense alongshore velocities with magnitudes typically exceeding 30 cm s−1, related to intensified winds associated with cold fronts invading the western Gulf during fall-winter, via coastal-trapped motions coming from northern locations. These motions can be explained by a time-dependent coastal-trapped wave (CTW) mode, using a phase speed (∼4 m s−1) which is consistent with analyses of correlation/lag of historical sea level data, CTW dynamic modes, and sensitivity to such a phase speed. The CTW time-dependent mode reproduces most of the variability of the sea level and hence the alongshore barotropic velocity observed at the mooring, and it can also be used to estimate the contribution of remote regions to the variance observed at the central portion of the western Gulf (the mooring's location). More than half of that variance is generated in the southernmost coast of Texas and northernmost coast of Tamaulipas, and ∼40% is generated in the central and southern portions of Tamaulipas coast. Thus, the method described in this paper is useful not only to explain the near-coastal flow variability but it also presents the potential predictability of intensified-flow events in the western Gulf of Mexico.