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首页> 外文期刊>Marine Chemistry >Seasonal behavior of dissolved cadmium and Cd/PO_4 ratio in Todos Santos Bay: A retention site of upwelled waters in the Baja California peninsula, Mexico
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Seasonal behavior of dissolved cadmium and Cd/PO_4 ratio in Todos Santos Bay: A retention site of upwelled waters in the Baja California peninsula, Mexico

机译：托多斯桑托斯湾中溶解镉的季节性行为和Cd / PO_4的比率：墨西哥下加利福尼亚半岛上涌水的保留地

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摘要

This work analyzes the spatial and seasonal variability of dissolved cadmium (Cd_d) and the cadmium to phosphate ratio (Cd/PO_4) in surface waters of Todos Santos Bay (TSB), a semi-enclosed bay within the upwelling zone of the Baja California peninsula (Mexico). The waters inside the bay (17.74 ± 0.42 ℃) were on average warmer than the adjacent Pacific waters (14.67 ± 0.52 ℃) indicating the retentive nature of circulation within TSB. Cd_d and PO_4 concentrations and Cd/PO_4 ratios for this region are comparable to those reported for the California Current System. Cd_d (0.30 ± 0.036 nM) and PO_4 (0.97 ± 0.061 μM) concentrations outside of the bay presented a seasonal signal which was positively correlated with the local coastal upwelling index (CUI), suggesting that the magnitude of temporal variability of Cd_d is partially controlled by the intensity of upwelling. In contrast, average Cd_d (0.15 ± 0.018 nM) and PO_4 (0.51 ± 0.034 μM) concentrations within the bay were approximately 50% less than those of the oceanic region, indicating that both elements are removed inside TSB. The dissolved Cd/PO_4 ratio was not constant on a seasonal scale between the inside and outside of the bay, with higher values in the spring associated with upwelling conditions and greater phytoplankton biomass. Our findings show that there is a decoupling of Cd and PO_4 cycles within TSB during the upwelling season, which is caused by an intensification of biological activity associated with the retention of water inside the bay. To explain the decoupling between Cd and PO_4, we speculate that during the upwelling season this coastal system is temporarily relieved from micronutrient Zn limitation, causing an increase in the dissolved Cd/PO_4 ratio due to preferential uptake of PO_4 by phytoplankton. The seasonal variability of the dissolved Cd/PO_4 ratios suggests that the Cd/Ca proxy must be used with caution to reconstruct past PO_4 concentrations in surface waters of upwelling regions.
机译：这项工作分析了下加利福尼亚州半岛上升流区内的半封闭海湾Todos Santos Bay（TSB）地表水中溶解镉（Cd_d）的空间和季节变化以及镉与磷酸盐的比率（Cd / PO_4） （墨西哥）。海湾内的水域（17.74±0.42℃）平均比相邻的太平洋水域（14.67±0.52℃）温暖，表明TSB内的环流具有保持性。该区域的Cd_d和PO_4浓度以及Cd / PO_4比率与“加利福尼亚现行系统”报道的相当。海湾以外的Cd_d（0.30±0.036 nM）和PO_4（0.97±0.061μM）浓度呈现季节性信号，与当地沿海上升指数（CUI）正相关，表明Cd_d的时间变化幅度受到部分控制由上升流的强度。相反，海湾内的平均Cd_d（0.15±0.018 nM）和PO_4（0.51±0.034μM）浓度比大洋区域的浓度低约50％，这表明这两个元素在TSB内都被去除了。在海湾内部和外部之间的季节性尺度上，溶解的Cd / PO_4比例不是恒定的，春季的更高值与上升流条件和更大的浮游植物生物量有关。我们的研究结果表明，上升流季节TSB中的Cd和PO_4循环解耦，这是由于与海湾内水保留相关的生物活性增强所致。为了解释Cd和PO_4之间的解耦关系，我们推测在上升季节中，该沿海系统暂时摆脱了微量营养元素Zn的限制，由于浮游植物优先吸收PO_4而导致溶解的Cd / PO_4比例增加。溶解的Cd / PO_4比率的季节变化表明，必须谨慎使用Cd / Ca替代物来重建上升流地区地表水中过去的PO_4浓度。

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  • 来源
    《Marine Chemistry》 |2015年第1期|37-48|共12页
  • 作者

    F. Delgadillo-Hinojosa; V. Camacho-Ibar; M.A. Huerta-Diaz; V. Torres-Delgado; P. Perez-Brunius; L. Lares; S.G. Marinone; J.A. Segovia; J.L. Pena-Manjarrez; E. Garcia-Mendoza; R. Castro;

  • 作者单位

    Instituto de Investigaciones Oceanologicas, Universidad Autonoma de Baja California, Campus Sauzal, Carretera Transpeninsular Ensenada-Tijuana, No. 3917, Frac. Playitas, Ensenada, Baja California CP 22860, Mexico;

    Instituto de Investigaciones Oceanologicas, Universidad Autonoma de Baja California, Campus Sauzal, Carretera Transpeninsular Ensenada-Tijuana, No. 3917, Frac. Playitas, Ensenada, Baja California CP 22860, Mexico;

    Instituto de Investigaciones Oceanologicas, Universidad Autonoma de Baja California, Campus Sauzal, Carretera Transpeninsular Ensenada-Tijuana, No. 3917, Frac. Playitas, Ensenada, Baja California CP 22860, Mexico;

    Instituto de Investigaciones Oceanologicas, Universidad Autonoma de Baja California, Campus Sauzal, Carretera Transpeninsular Ensenada-Tijuana, No. 3917, Frac. Playitas, Ensenada, Baja California CP 22860, Mexico;

    Division de Oceanologia, Departamento de Oceanografia Fisica, Centro de Investigacion Cientifica y de Educacion Superior de Ensenada (CICESE), Km 107 Carretera Transpeninsular Ensenada-Tijuana, Ensenada, Baja California CP 22860, Mexico;

    Division de Oceanologia, Departamento de Oceanografia Biologica, Centro de Investigacion Cientifica y de Educacion Superior de Ensenada (CICESE), Km 107 Carretera Transpeninsular Ensenada-Tijuana, Ensenada, Baja California CP 22860, Mexico;

    Division de Oceanologia, Departamento de Oceanografia Fisica, Centro de Investigacion Cientifica y de Educacion Superior de Ensenada (CICESE), Km 107 Carretera Transpeninsular Ensenada-Tijuana, Ensenada, Baja California CP 22860, Mexico;

    Instituto de Investigaciones Oceanologicas, Universidad Autonoma de Baja California, Campus Sauzal, Carretera Transpeninsular Ensenada-Tijuana, No. 3917, Frac. Playitas, Ensenada, Baja California CP 22860, Mexico;

    Centro de Estudios Tecnologicos del Mar en Ensenada, Km. 6.5 Carretera Transpeninsular Ensenada-Tijuana, Ensenada, Baja California, Mexico;

    Division de Oceanologia, Departamento de Oceanografia Biologica, Centro de Investigacion Cientifica y de Educacion Superior de Ensenada (CICESE), Km 107 Carretera Transpeninsular Ensenada-Tijuana, Ensenada, Baja California CP 22860, Mexico;

    Facultad de Ciencias Marinas, Universidad Autonoma de Baja California, Campus Sauzal, Carretera Transpeninsular Ensenada-Tijuana, No. 3917, Frac. Playitas, Ensenada, Baja California CP 22860, Mexico;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cadmium; Phosphate; Cd/PO_4 ratio; Upwelling; Baja California Peninsula;

    机译：镉;磷酸盐;Cd / PO_4比;上升流下加利福尼亚半岛;

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