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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Influences of riverine and upwelling waters on the coastal carbonate system off Central Chile and their ocean acidification implications
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Influences of riverine and upwelling waters on the coastal carbonate system off Central Chile and their ocean acidification implications

机译：河流和上升水对智利中部沿海碳酸盐系统的影响及其对海洋酸化的影响

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A combined data set, combining data from field campaigns and oceanographic cruises, was used to ascertain the influence of both river discharges and upwelling processes, covering spatial and temporal variation in dissolved inorganic carbon (DIC) and aragonite saturation state. This work was conducted in one of the most productive river-influenced upwelling areas in the South Pacific coasts (36°S). Additionally, further work was also conducted to ascertain the contribution of different DIC sources, influencing the dynamics of DIC along the land-ocean range. Six sampling campaigns were conducted across seven stations at the Biobío River basin, covering approximately 200km. Three research cruises were undertaken simultaneously, covering the adjacent continental shelf, including 12 sampling stations for hydrographic measurements. Additionally, six stations were also sampled for chemical analyses, covering summer, winter, and spring conditions over 2010 and 2011. Our results evidenced that seaward extent of the river plume was more evident during the winter field campaign, when highest riverine DIC fluxes were observed. The carbonate system along the river-ocean continuum was very heterogeneous varying over spatial and temporal scales. High DIC and pCO_2 were observed in river areas with larger anthropogenic effects. CO_2 supersaturation at the river plume was observed during all campaigns due to the influence of low pH river waters in winter/spring and high-pCO_2 upwelling waters in summer. δ~(13)C_(DIC) evidenced that main DIC sources along the river and river plume corresponded to the respiration of terrestrial organic matter. We have linked this natural process to the carbonate saturation on the adjacent river-influenced coastal area, suggesting that Ω_(aragonite) undersaturation in surface/subsurface waters is largelymodulated by the influence of both river discharge and coastal upwelling events in this productive coastal area. Conditions of low Ω_(aragonite) might impact negatively physiological traits for marine organisms, such as bivalves, gastropods, and crustaceans. Therefore, local populations from river-influenced sites could be inherently more tolerant to ocean acidification than organisms living in regions with lower Ω_(aragonite) variability.
机译：结合了来自野战活动和海洋航行的数据的组合数据集被用于确定河流流量和上升过程的影响，涵盖溶解性无机碳（DIC）和文石饱和状态的时空变化。这项工作是在南太平洋沿岸（36°S）受河流影响最大的上升流地区之一进行的。此外，还进行了进一步的工作来确定不同DIC来源的贡献，从而影响DIC在陆地-海洋范围内的动态。在比奥比奥河流域的七个站进行了六次采样运动，覆盖了约200公里。同时进行了三个研究航行，覆盖了邻近的大陆架，包括12个用于水文测量的采样站。此外，还对六个站点进行了化学分析采样，涵盖了2010年和2011年的夏季，冬季和春季状况。我们的结果表明，在冬季野外运动期间，当观察到最高的河流DIC通量时，河羽的向海范围更加明显。沿河-海洋连续体的碳酸盐体系在空间和时间尺度上变化很大。在人为影响较大的河流地区观察到较高的DIC和pCO_2。由于冬季/春季低pH值河水和夏季高pCO_2上升流水的影响，在所有运动中均观察到河羽中的CO_2过饱和。 δ〜（13）C_（DIC）证明了沿河和河羽的主要DIC来源与陆地有机物的呼吸作用相对应。我们将此自然过程与邻近的河流影响的沿海地区的碳酸盐饱和度联系起来，表明在这个生产性沿海地区，地表/地下水的Ω_（文石）欠饱和度很大程度上受到河流排放量和沿海上升事件的影响。低Ω_（文石）的条件可能会对海洋生物（例如双壳类，腹足类和甲壳类动物）的生理特性产生负面影响。因此，与生活在Ω_（文石）变异性较低的地区的生物相比，来自河流影响地区的当地居民对海洋酸化的耐受性更高。

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