Abstract Sea surface temperature (SST) variability was analyzed in the Northwestern Gulf of Mexico over the period 1982–2018. This analysis was carried out by the combination of reanalysis databases (OISST1/4 and CFSR) and a hydrodynamic model (ROMS). SST warming is detected throughout the year with the exception of the Louisiana-Texas shelf where a cooling is observed during winter months (November–February). The existence of a different SST trend near coast with respect to open ocean is related to Mississippi and Atchafalaya River plumes. The bigger differences, between plume area cooling and ocean warming, are detected under the plume reinforcement driven by an increment in the freshwater discharge. The plume reinforcement increases the stratification and reduces the vertical mixing, favoring the atmospheric cooling of coastal SST during winter.

中文翻译：

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密西西比河和阿查法拉亚河羽流对墨西哥湾西北部冬季沿海降温的影响

摘要 分析了 1982 年至 2018 年期间墨西哥湾西北部的海面温度 (SST) 变化。该分析是通过再分析数据库（OISST1/4 和 CFSR）和水动力模型（ROMS）的组合进行的。除了路易斯安那 - 德克萨斯大陆架在冬季（11 月至 2 月）观察到降温外，全年都可以检测到海温变暖。相对于公海，海岸附近存在不同的 SST 趋势与密西西比河和阿查法拉亚河羽流有关。羽流区域冷却和海洋变暖之间的更大差异是在淡水排放增加驱动的羽流强化下检测到的。羽流强化增加了分层并减少了垂直混合，有利于冬季沿海 SST 的大气冷却。