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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Controls on Carbonate System Dynamics in a Coastal Plain Estuary: A Modeling Study
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Controls on Carbonate System Dynamics in a Coastal Plain Estuary: A Modeling Study

机译：对沿海普通河口碳酸盐系统动态的控制：建模研究

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摘要

The study of acidification in Chesapeake Bay is challenged by the complex spatial and temporal patterns of estuarine carbonate chemistry driven by highly variable freshwater and nutrient inputs. A new module was developed within an existing coupled hydrodynamic-biogeochemical model to understand the underlying processes controlling variations in the carbonate system. We present a validation of the model against a diversity of field observations, which demonstrated the model's ability to reproduce large-scale carbonate chemistry dynamics of Chesapeake Bay. Analysis of model results revealed that hypoxia and acidification were observed to cooccur in midbay bottom waters and seasonal cycles in these metrics were regulated by aerobic respiration and vertical mixing. Calcium carbonate dissolution was an important buffering mechanism for pH changes in late summer, leading to stable or slightly higher pH values in this season despite persistent hypoxic conditions. Model results indicate a strong spatial gradient in air-sea CO_2 fluxes, where the heterotrophic upper bay was a strong CO_2 source to atmosphere, the mid bay was a net sink with much higher rates of net photosynthesis, and the lower bay was in a balanced condition. Scenario analysis revealed that reductions in riverine nutrient loading will decrease the acid water volume (pH < 7.5) as a consequence of reduced organic matter generation and subsequent respiration, while bay-wide dissolved inorganic carbon (DIC) increased and pH declined under scenarios of continuous anthropogenic CO_2 emission. This analysis underscores the complexity of carbonate system dynamics in a productive coastal plain estuary with large salinity gradients.
机译：Chesapeake湾的酸化研究受到高度可变淡水和营养输入驱动的酯碳酸酯化学的复杂空间和时间图案的挑战。在现有耦合的流体动力学 - 生物地球技术模型中开发了一种新模块，以了解控制碳酸盐系统变化的底层过程。我们展示了模型的验证，以防止场景的多样性，这证明了模型再现切萨皮克湾的大规模碳酸盐化学动态的能力。模型结果的分析表明，观察到缺氧和酸化在中间底部水域中的Cooccur和这些度量的季节性循环受到有氧呼吸和垂直混合的调节。碳酸钙溶解是夏季晚期pH变化的重要缓冲机制，尽管存在持续的缺氧条件，本赛季的pH值稳定或略高。模型结果表明，空中海洋CO_2助焊剂中的一个强大的空间梯度，其中杂养上海湾是一个强大的CO_2源到大气，中间海湾是一种净水槽，净光合作用率得多，较低的海湾处于平衡状态健康）状况。情景分析显示，由于减少有机物质产生和随后的呼吸，河流营养负荷的减少将降低酸水量（pH <7.5），而在连续的情况下，湾宽溶解的无机碳（DIC）增加和pH值下降人为co_2排放。该分析强调了碳酸盐系统动态在具有大盐度梯度的生产沿海普通河口中的复杂性。

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    Chunqi Shen; Jeremy M. Testa; Ming Li; Wei-Jun Cai; George G. Waldbusser; W. Michael Kemp; Jeffrey Cornwell; Baoshan Chen; Jean Brodeur; Jianzhong Su;

  • 作者单位

    Chesapeake Biological Laboratory University of Maryland Center for Environmental Science Solomons MD USA;

    Chesapeake Biological Laboratory University of Maryland Center for Environmental Science Solomons MD USA;

    Horn Point Laboratory University of Maryland Center for Environmental Science Cambridge MD USA;

    School of Marine Science and Policy University of Delaware Newark DE USA;

    College of Earth Ocean and Atmosphere Science Oregon State University Corvallis OR USA;

    Horn Point Laboratory University of Maryland Center for Environmental Science Cambridge MD USA;

    Horn Point Laboratory University of Maryland Center for Environmental Science Cambridge MD USA;

    School of Marine Science and Policy University of Delaware Newark DE USA;

    School of Marine Science and Policy University of Delaware Newark DE USA;

    School of Marine Science and Policy University of Delaware Newark DE USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物分布与生物地理学;
  • 关键词

    Controls on; Carbonate System; Dynamics in;

    机译：控制;碳酸盐系统;动态;

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