Search Results - "LEHNHERR, Igor"

Methylmercury biogeochemistry: a review with special reference to Arctic aquatic ecosystems by Lehnherr, Igor

“…There has been increasing concern about mercury (Hg) levels in marine and freshwater organisms in the Arctic, due to the importance of traditional country…”
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Methylation of inorganic mercury in polar marine waters by Lehnherr, Igor, St. Louis, Vincent L., Hintelmann, Holger, Kirk, Jane L.

“…Monomethylmercury is a neurotoxin that accumulates in marine organisms. Incubation experiments suggest that methylation of inorganic mercury accounts for…”
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Ice Core Record of Persistent Short‐Chain Fluorinated Alkyl Acids: Evidence of the Impact From Global Environmental Regulations by Pickard, Heidi M., Criscitiello, Alison S., Persaud, Daniel, Spencer, Christine, Muir, Derek C. G., Lehnherr, Igor, Sharp, Martin J., De Silva, Amila O., Young, Cora J.

“…Short chain perfluoroalkylcarboxylic acids (scPFCAs, CxF2x+1COOH, x ≤ 3) are persistent compounds formed from atmospheric oxidation of fluorotelomer compounds…”
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Characterization of perfluoroalkyl substances in sediment cores from High and Low Arctic lakes in Canada by MacInnis, John J., Lehnherr, Igor, Muir, Derek C.G., Quinlan, Roberto, De Silva, Amila O.

“…Perfluoroalkyl substances (PFASs) are synthetic environmentally-persistent pollutants that are amenable to long-range transport and accumulation in remote…”
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The world’s largest High Arctic lake responds rapidly to climate warming by Lehnherr, Igor, St. Louis, Vincent L., Sharp, Martin, Gardner, Alex S., Smol, John P., Schiff, Sherry L., Muir, Derek C. G., Mortimer, Colleen A., Michelutti, Neil, Tarnocai, Charles, St. Pierre, Kyra A., Emmerton, Craig A., Wiklund, Johan A., Köck, Günter, Lamoureux, Scott F., Talbot, Charles H.

“…Using a whole-watershed approach and a combination of historical, contemporary, modeled and paleolimnological datasets, we show that the High Arctic’s largest…”
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Atmospheric mercury in the Canadian Arctic. Part I: A review of recent field measurements by Steffen, Alexandra, Lehnherr, Igor, Cole, Amanda, Ariya, Parisa, Dastoor, Ashu, Durnford, Dorothy, Kirk, Jane, Pilote, Martin

“…Long-range atmospheric transport and deposition are important sources of mercury (Hg) to Arctic aquatic and terrestrial ecosystems. We review here recent…”
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Determination of Monomethylmercury and Dimethylmercury in the Arctic Marine Boundary Layer by Baya, Pascale A, Gosselin, Michel, Lehnherr, Igor, St.Louis, Vincent L, Hintelmann, Holger

“…Our understanding of the biogeochemical cycling of monomethylmercury (MMHg) in the Arctic is incomplete because atmospheric sources and sinks of MMHg are still…”
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Mercury in Arctic marine ecosystems: Sources, pathways and exposure by Kirk, Jane L., Lehnherr, Igor, Andersson, Maria, Braune, Birgit M., Chan, Laurie, Dastoor, Ashu P., Durnford, Dorothy, Gleason, Amber L., Loseto, Lisa L., Steffen, Alexandra, St. Louis, Vincent L.

“…Mercury in the Arctic is an important environmental and human health issue. The reliance of Northern Peoples on traditional foods, such as marine mammals, for…”
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Differences in Mercury Bioaccumulation between Polar Bears (Ursus maritimus) from the Canadian high- and sub-Arctic by St. Louis, Vincent L, Derocher, Andrew E, Stirling, Ian, Graydon, Jennifer A, Lee, Caroline, Jocksch, Erin, Richardson, Evan, Ghorpade, Sarah, Kwan, Alvin K, Kirk, Jane L, Lehnherr, Igor, Swanson, Heidi K

“…Polar bears (Ursus maritimus) are being impacted by climate change and increased exposure to pollutants throughout their northern circumpolar range. In this…”
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400-Year Record of Atmospheric Mercury from Tree-Rings in Northwestern Canada by Clackett, Sydney P, Porter, Trevor J, Lehnherr, Igor

“…Tree-rings are a promising high-resolution archive for gaseous atmospheric mercury (composed primarily of Hg0) reconstruction, but the influence of cambial age…”
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The tree-ring mercury record of Klondike gold mining at Bear Creek, central Yukon by Clackett, Sydney P., Porter, Trevor J., Lehnherr, Igor

“…Use of elemental mercury (Hg0) to enhance placer gold recovery is an effective method dating back centuries, but is associated with significant atmospheric Hg0…”
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Atmospheric mercury in the Canadian Arctic. Part II: Insight from modeling by Dastoor, Ashu, Ryzhkov, Andrew, Durnford, Dorothy, Lehnherr, Igor, Steffen, Alexandra, Morrison, Heather

“…A review of mercury in the Canadian Arctic with a focus on field measurements is presented in part I (see Steffen et al., this issue). Here we provide insights…”
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Mercury at the top of the world: A 31-year record of mercury in Arctic char in the largest High Arctic lake, linked to atmospheric mercury concentrations and climate oscillations by Hudelson, Karista, Muir, Derek C.G., Köck, Günter, Wang, Xiaowa, Kirk, Jane L., Lehnherr, Igor

“…Lake Hazen, the largest lake north of the Arctic circle, is being impacted by mercury (Hg) pollution and climate change. The lake is inhabited by two…”
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Methylmercury Transport and Fate Shows Strong Seasonal and Spatial Variability along a High Arctic Freshwater Hydrologic Continuum by Varty, Stephanie, Lehnherr, Igor, St Pierre, Kyra, Kirk, Jane, Wisniewski, Victoria

“…The presence of toxic methylmercury (MeHg) in Arctic freshwater ecosystems and foodwebs is a potential health concern for northern Indigenous people…”
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Mercury deposition to lake sediments near historic gold mines in northern Canada by Cheney, Cynthia L., Eccles, Kristin M., Kimpe, Linda E., Lehnherr, Igor, Blais, Jules M.

“…Mercury (Hg) contamination in aquatic systems can lead to adverse human and environmental health outcomes. Yellowknife, a city in Canada’s Northwest…”
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Atmospheric Deposition of Mercury and Methylmercury to Landscapes and Waterbodies of the Athabasca Oil Sands Region by Kirk, Jane L, Muir, Derek C. G, Gleason, Amber, Wang, Xiaowa, Lawson, Greg, Frank, Richard A, Lehnherr, Igor, Wrona, Fred

“…Atmospheric deposition of metals originating from a variety of sources, including bitumen upgrading facilities and blowing dusts from landscape disturbances,…”
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Glacial Melt Inputs of Organophosphate Ester Flame Retardants to the Largest High Arctic Lake by Sun, Yuxin, De Silva, Amila O, St Pierre, Kyra A, Muir, Derek C. G, Spencer, Christine, Lehnherr, Igor, MacInnis, John J

“…Organophosphate esters (OPEs) have been detected in the Arctic environment, but the influence of glacial melt on the environmental behavior of OPEs in…”
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Mercury in the marine environment of the Canadian Arctic: Review of recent findings by Braune, Birgit, Chételat, John, Amyot, Marc, Brown, Tanya, Clayden, Meredith, Evans, Marlene, Fisk, Aaron, Gaden, Ashley, Girard, Catherine, Hare, Alex, Kirk, Jane, Lehnherr, Igor, Letcher, Robert, Loseto, Lisa, Macdonald, Robie, Mann, Erin, McMeans, Bailey, Muir, Derek, O'Driscoll, Nelson, Poulain, Alexandre, Reimer, Ken, Stern, Gary

“…This review summarizes data and information which have been generated on mercury (Hg) in the marine environment of the Canadian Arctic since the previous…”
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Importance of Ultraviolet Radiation in the Photodemethylation of Methylmercury in Freshwater Ecosystems by Lehnherr, Igor, St. Louis, Vincent L

“…Photodemethylation (PD) is thought to be the most important biogeochemical sink of methylmercury (MeHg) in freshwater lakes. However, we possess little…”
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Proglacial freshwaters are significant and previously unrecognized sinks of atmospheric CO2 by St Pierre, Kyra A, St Louis, Vincent L, Schiff, Sherry L, Lehnherr, Igor, Dainard, Paul G, Gardner, Alex S, Aukes, Pieter J K, Sharp, Martin J

“…Carbon dioxide (CO2) emissions from freshwater ecosystems are almost universally predicted to increase with climate warming. Glacier-fed rivers and lakes,…”
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