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An Improved Global Model for Air-Sea Exchange of Mercury: High Concentrations over the North Atlantic

机译：一种改进的全球海空汞交换模型：北大西洋的高浓度

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摘要

We develop an improved treatment of the surface ocean in the GEOS-Chem global 3-D biogeochemical model for mercury (Hg). We replace the globally uniform subsurface ocean Hg concentrations used in the original model with basin-specific values based on measurements. Updated chemical mechanisms for Hg°/Hg" redox reactions in the surface ocean include both photochemical and biological processes, and we improved the parametrization of particle-associated Hg scavenging. Modeled aqueous Hg concentrations are consistent with limited surface water observations. Results more accurately reproduce high-observed MBL concentrations over the North Atlantic (NA) and the associated seasonal trends. High seasonal evasion in the NA is driven by inputs from Hg enriched subsurface waters through entrainment and Ekman pumping. Globally, subsurface waters account for 40% of Hg inputs to the ocean mixed layer, and 60% is from atmospheric deposition. Although globally the ocean is a net sink for 3.8 Mmol Hg y~(-1), the NA is a net source to the atmosphere, potentially due to enrichment of subsurface waters with legacy Hg from historical anthropogenic sources.
机译：我们在GEOS-Chem全球3-D生物地球化学模型中的汞（Hg）中开发了一种改进的对表层海洋的处理方法。我们将基于测量的特定于盆地的值替换了原始模型中使用的全球统一的地下海洋汞浓度。用于表层海洋中Hg°/ Hg“氧化还原反应的最新化学机理包括光化学过程和生物过程，并且我们改善了与颗粒相关的Hg清除的参数化。模拟的Hg浓度与有限的地表水观测结果一致。结果更精确地再现高观测到的北大西洋（MB）的MBL浓度及相关的季节趋势；北美洲的高季节性逃逸是由富含汞的地下水通过夹带和埃克曼抽水的输入驱动的；在全球范围内，地下水占汞输入的40％到海洋混合层，其中60％来自大气沉积物尽管全球海洋是3.8 Mmol Hg y〜（-1）的净汇，但NA是大气的净源，可能是由于地下水的富集以及来自历史人为来源的遗留汞。

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  • 来源
    《Environmental Science & Technology》 |2010年第22期|p.8574-8580|共7页
  • 作者

    ANNE L. SOERENSEN; ELSIE M. SUNDERLAND; CHRISTOPHER D. HOLMES; DANIEL J. JACOB; ROBERT M. YANTOSCA; HENRIK SKOV; JESPER H. CHRISTENSEN; SARAH A. STRODE; ROBERT P. MASON;

  • 作者单位

    National Environmental Research Institute, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark,School of Engineering and Applied Sciences and Department of Earth and Planetary Sciences, Harvard University, Cambridge Massachusetts 02138, United States;

    School of Engineering and Applied Sciences and Department of Earth and Planetary Sciences, Harvard University, Cambridge Massachusetts 02138, United States,Department of Environmental Health, Harvard University School of Public Health, Boston Massachusetts 02115, United States;

    School of Engineering and Applied Sciences and Department of Earth and Planetary Sciences, Harvard University, Cambridge Massachusetts 02138, United States;

    School of Engineering and Applied Sciences and Department of Earth and Planetary Sciences, Harvard University, Cambridge Massachusetts 02138, United States;

    School of Engineering and Applied Sciences and Department of Earth and Planetary Sciences, Harvard University, Cambridge Massachusetts 02138, United States;

    National Environmental Research Institute, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;

    National Environmental Research Institute, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;

    Department of Atmospheric Sciences, University of Washington, Seattle, Washington 98195, United States;

    Department of Marine Sciences, University of Connecticut, 1080 Shennecossett Road, Groton, Connecticut, 0634, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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