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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Influence of post-Tehuano oceanographic processes in the dynamics of the CO_2 system in the Gulf of Tehuantepec, Mexico
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Influence of post-Tehuano oceanographic processes in the dynamics of the CO_2 system in the Gulf of Tehuantepec, Mexico

机译：特瓦诺后海洋学过程对墨西哥特万特佩克湾CO_2系统动力学的影响

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摘要

This investigation reports, for the first time, results of CO_2 system variables in the Gulf of Tehuantepec, located in the Mexican tropical Pacific. We quantified the post-Tehuano concentration of dissolved inorganic carbon (DIC) and pH (April 2013). These values were used to calculate pCO_2, aragonite saturation (Ω_(Ar)), and air-sea CO_2 fluxes (FCO_2). The intense vertical stratification was found to contribute to the biogeochemical processes in surface waters (<70 m). However, in post-Tehuano conditions, high pCO_2 (~1000 μatm) and DIC concentrations (2200 μmol kg~(-1)), as well as low Ω_(Ar) (~1.1) and pH (~7.5), remain in surface waters for a few days after Tehuano winds have weakened. We identified four oceanographic areas: (a) a highly mixed region due to previous Tehuano events; (b) coastal upwelling in the western region; (c) mesoscale eddies; (d) a poleward surface coastal current. The first three promoted the influence of Subtropical Subsurface Water in the chemistry of surface waters, whereas the coastal current contributed to the horizontal advection of DIC. The calculated CO_2 fluxes ranged from -2.3 mmol m~(-2) d~(-1) in areas with stratified waters to over 25 mmol m~(-2) d~(-1) for mixed areas. Positive values indicate an ocean-to-atmosphere flux. Our findings suggest that the Gulf of Tehuantepec is a major source of CO_2 into the atmosphere.
机译：这项调查首次报告了位于墨西哥热带太平洋的特温特佩克湾的CO_2系统变量的结果。我们量化了特瓦诺后溶解无机碳（DIC）和pH的浓度（2013年4月）。这些值用于计算pCO_2，文石饱和度（Ω_（Ar））和海气CO_2通量（FCO_2）。发现强烈的垂直分层有助于地表水（<70 m）中的生物地球化学过程。但是，在特瓦诺（Tehuano）后的条件下，仍然存在较高的pCO_2（〜1000μatm）和DIC浓度（2200μmolkg〜（-1）），以及低Ω_（Ar）（〜1.1）和pH（〜7.5）。特瓦诺（Tehuano）风减弱后，地表水持续了几天。我们确定了四个海洋学区域：（a）由于先前的特瓦诺事件造成的高度混杂地区; （b）西部地区的沿海上升流; （c）中尺度涡旋; （d）极地表面沿海潮流。前三个因素促进了亚热带地下水对地表水化学的影响，而沿海水流则对DIC的水平对流做出了贡献。计算得出的CO_2通量范围从分层水域的-2.3 mmol m〜（-2）d〜（-1）到混合区域的25 mmol m〜（-2）d〜（-1）。正值表示海洋到大气的通量。我们的发现表明，特万特佩克湾是大气中CO_2的主要来源。

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