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Assessing biogeochemical impacts and environmental conditions associated with cross-shelf high chlorophyll plumes in the northern Gulf of Mexico.

机译：评估与墨西哥湾北部交叉架高叶绿素羽相关的生物地球化学影响和环境条件。

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摘要

The northern Gulf of Mexico is a complex marine system subject to episodic physical phenomena such as loop current eddies. Flow fields generated by these eddies can result in cross-shelf exchanges between riverine influenced shelf waters and the offshore water column. This study considers the impacts of high chlorophyll plumes (HCPs) resulting from cross-shelf exchanges to the bio-optical properties of affected waters, and how these plumes are influenced by their environment. The seasonal, interannual and decadal chlorophyll cycles of the Gulf of Mexico and the northern Gulf of Mexico are described to provide context for evaluating the ecological effects of HCPs. To determine the ecological effects of such exchanges, a regional 2007 cross-shelf exchange event is investigated using remotely sensed observations. The offshore ratio of bio-optical signals observed during the exchange event implies a divergence in surface water composition from the typical composition. To explore the impact of this composition change on the regional carbon budget, net primary productivity (NPP) estimates during the exchange event are compared with the climatological estimates, revealing increases of up to 330% for the corresponding time period. Select HCP CHL fields are compared with physical parameters and environmental conditions to explore drivers of HCP formation and conditions affecting HCP characteristics. This work supports suppositions that HCPs form as the result of a complex river-wind-circulation system and adds to the current understanding of CHL dynamics in the northern Gulf of Mexico by showing an association between HCP frequency and environmental conditions.
机译：墨西哥湾北部是一个复杂的海洋系统，容易受到诸如环流涡流等周期性物理现象的影响。这些涡流产生的流场会导致受河流影响的架子水与近海水柱之间的跨架交换。这项研究考虑了跨架交换产生的高叶绿素羽流（HCP）对受影响水域生物光学特性的影响，以及这些羽流如何受到环境的影响。描述了墨西哥湾和墨西哥湾北部的季节性，年际和年代际叶绿素循环，为评估HCP的生态效应提供了背景。为了确定此类交流的生态影响，使用遥感观测资料调查了2007年区域跨架交换事件。在交换事件中观察到的生物光学信号的离岸率意味着地表水成分与典型成分之间存在差异。为了探讨这种成分变化对区域碳预算的影响，将交换事件期间的净初级生产力（NPP）估计值与气候估计值进行比较，揭示出相应时间段内最多增加330％。将选定的HCP CHL字段与物理参数和环境条件进行比较，以探索HCP形成的驱动因素和影响HCP特性的条件。这项工作支持了HCP形成于复杂的河风循环系统的假设，并通过显示HCP频率与环境条件之间的联系，增加了对墨西哥湾北部CHL动力学的当前了解。

著录项

  • 作者

    Jones, Erin Brooke.;

  • 作者单位

    The University of Southern Mississippi.;

  • 授予单位 The University of Southern Mississippi.;
  • 学科 Physical oceanography.;Biology.;Biological oceanography.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 177 p.
  • 总页数 177
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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