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Contemporary and preindustrial mass budgets of mercury in the Hudson Bay Marine System: the role of sediment recycling.
Sci Total Environ. 2008 Nov 15; 406(1-2):190-204.ST

Abstract

Based on extensive sampling of the rivers, troposphere, seawater and sediments, mercury (Hg) mass budgets are constructed for both contemporary and preindustrial times in the Hudson Bay Marine System (HBS) to probe sources and pathways of Hg and their responses to the projected climate change. The contemporary total Hg inventory in the HBS is estimated to be 98 t, about 1% of which is present in the biotic systems and the remainder in the abiotic systems. The total contemporary Hg influx and outflux, around 6.3 t/yr each, represent a 2-fold increase from the preindustrial fluxes. The most notable changes are in the atmospheric flux, which has gone from a nearly neutral (0.1 t/yr) to source term (1.5 t/yr), increased river inputs (which may also reflect increased atmospheric deposition to the HBS watershed) and in the sedimentary burial flux which has increased by 2.4 t/yr over preindustrial values, implying that much of the modern Hg loading entering this system is buried in the sediments. The capacity to drive increased Hg loading from the atmosphere to sediment burial may be supported by the resuspension of an extraordinarily large flux (120 Mt/yr) of shallow water glacigenic sediments uncontaminated by anthropogenic Hg, which could scavenge Hg from the water column before being transported to the deeper accumulative basins. Under the projected climate warming in the region, the rate of the sediment recycling pump will likely increase due to enhanced Hg scavenging by increasing biological productivity, and thus strengthen atmosphere-ocean Hg exchanges in the HBS.

Authors+Show Affiliations

Department of Environment and Geography, University of Manitoba, Winnipeg, Canada MB R3T 2N2.No 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

18765159

Citation

Hare, Alexander, et al. "Contemporary and Preindustrial Mass Budgets of Mercury in the Hudson Bay Marine System: the Role of Sediment Recycling." The Science of the Total Environment, vol. 406, no. 1-2, 2008, pp. 190-204.
Hare A, Stern GA, Macdonald RW, et al. Contemporary and preindustrial mass budgets of mercury in the Hudson Bay Marine System: the role of sediment recycling. Sci Total Environ. 2008;406(1-2):190-204.
Hare, A., Stern, G. A., Macdonald, R. W., Kuzyk, Z. Z., & Wang, F. (2008). Contemporary and preindustrial mass budgets of mercury in the Hudson Bay Marine System: the role of sediment recycling. The Science of the Total Environment, 406(1-2), 190-204. https://doi.org/10.1016/j.scitotenv.2008.07.033
Hare A, et al. Contemporary and Preindustrial Mass Budgets of Mercury in the Hudson Bay Marine System: the Role of Sediment Recycling. Sci Total Environ. 2008 Nov 15;406(1-2):190-204. PubMed PMID: 18765159.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Contemporary and preindustrial mass budgets of mercury in the Hudson Bay Marine System: the role of sediment recycling. AU - Hare,Alexander, AU - Stern,Gary A, AU - Macdonald,Robie W, AU - Kuzyk,Zou Zou, AU - Wang,Feiyue, Y1 - 2008/09/02/ PY - 2008/04/15/received PY - 2008/07/12/revised PY - 2008/07/15/accepted PY - 2008/9/4/pubmed PY - 2009/1/23/medline PY - 2008/9/4/entrez SP - 190 EP - 204 JF - The Science of the total environment JO - Sci Total Environ VL - 406 IS - 1-2 N2 - Based on extensive sampling of the rivers, troposphere, seawater and sediments, mercury (Hg) mass budgets are constructed for both contemporary and preindustrial times in the Hudson Bay Marine System (HBS) to probe sources and pathways of Hg and their responses to the projected climate change. The contemporary total Hg inventory in the HBS is estimated to be 98 t, about 1% of which is present in the biotic systems and the remainder in the abiotic systems. The total contemporary Hg influx and outflux, around 6.3 t/yr each, represent a 2-fold increase from the preindustrial fluxes. The most notable changes are in the atmospheric flux, which has gone from a nearly neutral (0.1 t/yr) to source term (1.5 t/yr), increased river inputs (which may also reflect increased atmospheric deposition to the HBS watershed) and in the sedimentary burial flux which has increased by 2.4 t/yr over preindustrial values, implying that much of the modern Hg loading entering this system is buried in the sediments. The capacity to drive increased Hg loading from the atmosphere to sediment burial may be supported by the resuspension of an extraordinarily large flux (120 Mt/yr) of shallow water glacigenic sediments uncontaminated by anthropogenic Hg, which could scavenge Hg from the water column before being transported to the deeper accumulative basins. Under the projected climate warming in the region, the rate of the sediment recycling pump will likely increase due to enhanced Hg scavenging by increasing biological productivity, and thus strengthen atmosphere-ocean Hg exchanges in the HBS. SN - 0048-9697 UR - https://www.unboundmedicine.com/medline/citation/18765159/Contemporary_and_preindustrial_mass_budgets_of_mercury_in_the_Hudson_Bay_Marine_System:_the_role_of_sediment_recycling_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(08)00764-X DB - PRIME DP - Unbound Medicine ER -