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An improved global model for air-sea exchange of mercury: high concentrations over the North Atlantic.
Environ Sci Technol. 2010 Nov 15; 44(22):8574-80.ES

Abstract

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 Hg⁰/Hg(II) 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.

Authors+Show Affiliations

National Environmental Research Institute, Aarhus University, Roskilde, Denmark.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20973542

Citation

Soerensen, Anne L., et al. "An Improved Global Model for Air-sea Exchange of Mercury: High Concentrations Over the North Atlantic." Environmental Science & Technology, vol. 44, no. 22, 2010, pp. 8574-80.
Soerensen AL, Sunderland EM, Holmes CD, et al. An improved global model for air-sea exchange of mercury: high concentrations over the North Atlantic. Environ Sci Technol. 2010;44(22):8574-80.
Soerensen, A. L., Sunderland, E. M., Holmes, C. D., Jacob, D. J., Yantosca, R. M., Skov, H., Christensen, J. H., Strode, S. A., & Mason, R. P. (2010). An improved global model for air-sea exchange of mercury: high concentrations over the North Atlantic. Environmental Science & Technology, 44(22), 8574-80. https://doi.org/10.1021/es102032g
Soerensen AL, et al. An Improved Global Model for Air-sea Exchange of Mercury: High Concentrations Over the North Atlantic. Environ Sci Technol. 2010 Nov 15;44(22):8574-80. PubMed PMID: 20973542.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - An improved global model for air-sea exchange of mercury: high concentrations over the North Atlantic. AU - Soerensen,Anne L, AU - Sunderland,Elsie M, AU - Holmes,Christopher D, AU - Jacob,Daniel J, AU - Yantosca,Robert M, AU - Skov,Henrik, AU - Christensen,Jesper H, AU - Strode,Sarah A, AU - Mason,Robert P, Y1 - 2010/10/25/ PY - 2010/10/27/entrez PY - 2010/10/27/pubmed PY - 2011/2/15/medline SP - 8574 EP - 80 JF - Environmental science & technology JO - Environ Sci Technol VL - 44 IS - 22 N2 - 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 Hg⁰/Hg(II) 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. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/20973542/An_improved_global_model_for_air_sea_exchange_of_mercury:_high_concentrations_over_the_North_Atlantic_ L2 - https://doi.org/10.1021/es102032g DB - PRIME DP - Unbound Medicine ER -