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Water Masses and Circulation in the Tropical Pacific off Central Mexico and Surrounding Areas

机译：墨西哥中部及周边地区热带太平洋的水团和环流

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摘要

The seasonal variations and the interactions of the water masses in the tropical Pacific off central Mexico (TPCM) and four surrounding areas were examined based on an extensive new hydrographic database. The regional water masses were redefined in terms of absolute salinity (S-A) and conservative temperature (Theta) according to the Thermodynamic Equation of Seawater 2010 (TEOS-10). Hydrographic data and the evaporation-minus (precipitation + runoff) balance were used to investigate the origin and seasonality of two salinity minima in the area. The shallow(50-100 m) salinity minimum originates with the California Current System and becomes saltier as it extends southeastward and mixes with tropical subsurface waters while the surface salinity minimum extends farther north in the TPCM in summer and fall because of the northward advection of tropical surface waters. The interactions between water masses allow a characterization of the seasonal pattern of circulation of the Mexican Coastal Current (MCC), the tropical branch of the California Current, and the flows through the entrance of the Gulf of California. The seasonality of the MCC inferred from the distribution of the water masses largely coincides with the geostrophic circulation forced by an annual Rossby wave.
机译：基于广泛的新水文数据库，研究了墨西哥中部热带太平洋（TPCM）和四个周边地区的季节变化和水团之间的相互作用。根据2010年海水热力学方程（TEOS-10），根据绝对盐度（S-A）和保守温度（Theta）重新定义了区域水团。利用水文数据和蒸发负值（降水量+径流量）平衡来调查该地区两个盐度最小值的来源和季节性。浅水盐度最小值（50-100 m）起源于加利福尼亚洋流系统，随着向东南延伸并与热带地下水混合而变得更咸，而夏季盐度最小值最小值在TPCM中向北延伸，夏季和秋季由于南太平洋对流平流而下降。热带地表水域。水团之间的相互作用可以表征墨西哥沿海水流（MCC），加利福尼亚水流的热带分支以及流经加利福尼亚湾入口的水流的季节性模式。由水团的分布推断出的MCC的季节性与一年一度的Rossby波强迫的地转循环相吻合。

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  • 来源
    《Journal of Physical Oceanography》 |2016年第10期|3069-3081|共13页
  • 作者

    Portela Esther; Beier Emilio; Barton Eric D.; Castro Ruben; Godinez Victor; Palacios-Hernandez Emilio; Fiedler Paul C.; Sanchez-Velasco Laura; Trasvina Armando;

  • 作者单位

    Ctr Invest Cient & Educ Super Ensenada, Dept Oceanog Fis, Carretera Ensenada Tijuana 3918, Ensenada 22860, Baja California, Mexico;

    Ctr Invest Cient & Educ Super Ensenada, Unidad La Paz, La Paz, Baja California, Mexico;

    CSIC, Inst Invest Marinas, Vigo, Galicia, Spain;

    Univ Autonoma Baja California, Fac Ciencias Marinas, Ensenada, Baja California, Mexico;

    Ctr Invest Cient & Educ Super Ensenada, Dept Oceanog Fis, Carretera Ensenada Tijuana 3918, Ensenada 22860, Baja California, Mexico;

    Univ Guadalajara, Dept Phys, Guadalajara, Jalisco, Mexico;

    NOAA, Southwest Fisheries Sci Ctr, La Jolla, CA USA;

    Inst Politecn Nacl, Ctr Interdisciplinario Ciencias Marinas, Dept Plancton & Ecol Marina, La Paz, Mexico;

    Ctr Invest Cient & Educ Super Ensenada, Unidad La Paz, La Paz, Baja California, Mexico;

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