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Drivers of surface ocean mercury concentrations and air-sea exchange in the West Atlantic Ocean.
Environ Sci Technol. 2013 Jul 16; 47(14):7757-65.ES

Abstract

Accurately characterizing net evasion of elemental mercury (Hg(0)) from marine systems is essential for understanding the global biogeochemical mercury (Hg) cycle and the pool of divalent Hg (Hg(II)) available for methylation. Few high resolution measurements of Hg(0) are presently available for constraining global and regional flux estimates and for understanding drivers of spatial and temporal variability in evasion. We simultaneously measured high-resolution atmospheric and surface seawater Hg(0) concentrations as well as the total Hg distribution during six cruises in the West Atlantic Ocean between 2008 and 2010 and examined environmental factors affecting net Hg(0) formation and evasion. We observed the lowest fraction of Hg as Hg(0) (7.8 ± 2.4%) in the near-coastal and shelf areas that are influenced by riverine inputs. Significantly higher %Hg(0) observed in open ocean areas (15.8 ± 3.9%) may reflect lower dissolved organic carbon (DOC) in offshore environments, which is known to affect both the reducible Hg(II) pool and redox kinetics. Calculated Hg(0) evasion changed by more than a factor of 3 between cruises (range: 2.1 ± 0.7 to 6.8 ± 5.1 ng m(-2) h(-1)), driven mainly by variability in Hg(0) and wind speed. Our results suggest that further mechanistic understanding of the role of DOC on Hg redox kinetics in different types of marine environments is needed to explain variability in Hg(0) concentrations and improve global estimates of air-sea exchange.

Authors+Show Affiliations

Department of Environmental Health, Harvard School of Public Health , Boston, Massachusetts 02215, USA. alsoeren@hsph.harvard.eduNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

23758558

Citation

Soerensen, Anne L., et al. "Drivers of Surface Ocean Mercury Concentrations and Air-sea Exchange in the West Atlantic Ocean." Environmental Science & Technology, vol. 47, no. 14, 2013, pp. 7757-65.
Soerensen AL, Mason RP, Balcom PH, et al. Drivers of surface ocean mercury concentrations and air-sea exchange in the West Atlantic Ocean. Environ Sci Technol. 2013;47(14):7757-65.
Soerensen, A. L., Mason, R. P., Balcom, P. H., & Sunderland, E. M. (2013). Drivers of surface ocean mercury concentrations and air-sea exchange in the West Atlantic Ocean. Environmental Science & Technology, 47(14), 7757-65. https://doi.org/10.1021/es401354q
Soerensen AL, et al. Drivers of Surface Ocean Mercury Concentrations and Air-sea Exchange in the West Atlantic Ocean. Environ Sci Technol. 2013 Jul 16;47(14):7757-65. PubMed PMID: 23758558.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Drivers of surface ocean mercury concentrations and air-sea exchange in the West Atlantic Ocean. AU - Soerensen,Anne L, AU - Mason,Robert P, AU - Balcom,Prentiss H, AU - Sunderland,Elsie M, Y1 - 2013/07/02/ PY - 2013/6/14/entrez PY - 2013/6/14/pubmed PY - 2014/3/19/medline SP - 7757 EP - 65 JF - Environmental science & technology JO - Environ Sci Technol VL - 47 IS - 14 N2 - Accurately characterizing net evasion of elemental mercury (Hg(0)) from marine systems is essential for understanding the global biogeochemical mercury (Hg) cycle and the pool of divalent Hg (Hg(II)) available for methylation. Few high resolution measurements of Hg(0) are presently available for constraining global and regional flux estimates and for understanding drivers of spatial and temporal variability in evasion. We simultaneously measured high-resolution atmospheric and surface seawater Hg(0) concentrations as well as the total Hg distribution during six cruises in the West Atlantic Ocean between 2008 and 2010 and examined environmental factors affecting net Hg(0) formation and evasion. We observed the lowest fraction of Hg as Hg(0) (7.8 ± 2.4%) in the near-coastal and shelf areas that are influenced by riverine inputs. Significantly higher %Hg(0) observed in open ocean areas (15.8 ± 3.9%) may reflect lower dissolved organic carbon (DOC) in offshore environments, which is known to affect both the reducible Hg(II) pool and redox kinetics. Calculated Hg(0) evasion changed by more than a factor of 3 between cruises (range: 2.1 ± 0.7 to 6.8 ± 5.1 ng m(-2) h(-1)), driven mainly by variability in Hg(0) and wind speed. Our results suggest that further mechanistic understanding of the role of DOC on Hg redox kinetics in different types of marine environments is needed to explain variability in Hg(0) concentrations and improve global estimates of air-sea exchange. SN - 1520-5851 UR - https://www.unboundmedicine.com/medline/citation/23758558/Drivers_of_surface_ocean_mercury_concentrations_and_air_sea_exchange_in_the_West_Atlantic_Ocean_ L2 - https://doi.org/10.1021/es401354q DB - PRIME DP - Unbound Medicine ER -