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pH evolution in sea ice grown at an outdoor experimental facility

机译:在室外实验设施中生长的海冰中的pH值演变

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摘要

The pH of sea ice and brine was experimentally determined during initial ice growth and melt at the Sea-ice Environmental Research Facility (SERF), an outdoor experimental sea ice facility in Winnipeg, Canada. pH measurements were performed potentiometrically and spectroscopically at near-freezing temperatures. Vertical pH profiles from bulk ice cores revealed a consistent C-shaped pattern during columnar ice growth, with highest pH values (>9) in both exterior (top and bottom) ice sections and in frost flowers, and lowest pH (-7) in interior ice sections. Brine pH typically remained below that of the source seawater pH (-8.4). The distinct differences between these ice features and the underlying seawater source demonstrate the effect of the natural freezing process and associated changes in the CO_2-carbonate system on the pH of the sea ice environment. Interpreting this effect provides new insight into the conditions leading to CO_2 exchange across the ocean-sea ice-atmosphere interface. A conceptual model of pH evolution in seawater, sea ice and brine, and frost flowers is proposed to explain the observed pH characteristics of seawater components during sea ice growth and melt.
机译:海冰和盐水的pH在初始冰生长过程中通过实验确定,并在加拿大温尼伯的室外实验海冰设施海冰环境研究设施(SERF)中融化。 pH值的测量是在接近冰点的温度下用电位分光光度法和分光镜进行的。散装冰芯的垂直pH分布显示出柱状冰生长过程中呈一致的C形图案,外部(顶部和底部)冰区和霜花的pH值最高(> 9),而在冰霜花中pH最低(-7)。室内冰块。盐水的pH值通常保持低于源海水的pH值(-8.4)。这些冰特征与潜在的海水源之间的明显差异表明了自然冻结过程的影响以及CO_2-碳酸盐系统中相关变化对海冰环境pH的影响。解释这种影响提供了对导致跨海冰海-大气界面进行CO_2交换的条件的新见解。提出了一个在海水,海冰,盐水和霜花中pH演变的概念模型,以解释在海冰生长和融化过程中观察到的海水成分的pH特性。

著录项

  • 来源
    《Marine Chemistry》 |2013年第20期|46-54|共9页
  • 作者单位

    Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg MB R3T 2N2, Canada;

    Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg MB R3T 2N2, Canada,Department of Chemistry, University of Manitoba, Winnipeg MB R3T2N2, Canada;

    Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg MB R3T 2N2, Canada;

    Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg MB R3T 2N2, Canada;

    Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg MB R3T 2N2, Canada;

    Centre for Earth Observation Science, Department of Environment and Geography, University of Manitoba, Winnipeg MB R3T 2N2, Canada,Department of Geological Sciences, University of Manitoba, Winnipeg MB R3T 2N2, Canada,Greenland Climate Research Centre, Greenland Institute of Natural Resources, 3900 Nuuk, Greenland,Arctic Research Centre, Aarhus University, 8000 Aarhus, Denmark;

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

    Sea ice; Brine; Salinity; Carbon dioxide; pH;

    机译:海冰;盐水;盐度;二氧化碳;pH值;

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