Search Results - "Amos, Helen M"

Legacy impacts of all-time anthropogenic emissions on the global mercury cycle by Amos, Helen M., Jacob, Daniel J., Streets, David G., Sunderland, Elsie M.

“…Elevated mercury (Hg) in marine and terrestrial ecosystems is a global health concern because of the formation of toxic methylmercury. Humans have emitted Hg…”
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Observed decrease in atmospheric mercury explained by global decline in anthropogenic emissions by Zhang, Yanxu, Jacob, Daniel J., Horowitz, Hannah M., Chen, Long, Amos, Helen M., Krabbenhoft, David P., Slemr, Franz, St. Louis, Vincent L., Sunderland, Elsie M.

“…Observations of elemental mercury (Hg⁰) at sites in North America and Europe show large decreases (∼1–2% y⁻¹) from 1990 to present. Observations in background…”
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A new mechanism for atmospheric mercury redox chemistry: implications for the global mercury budget by Horowitz, Hannah M, Jacob, Daniel J, Zhang, Yanxu, Dibble, Theodore S, Slemr, Franz, Amos, Helen M, Schmidt, Johan A, Corbitt, Elizabeth S, Marais, Eloïse A, Sunderland, Elsie M

“…Mercury (Hg) is emitted to the atmosphere mainly as volatile elemental Hg0. Oxidation to water-soluble HgII plays a major role in Hg deposition to ecosystems…”
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Historical Mercury Releases from Commercial Products: Global Environmental Implications by Horowitz, Hannah M, Jacob, Daniel J, Amos, Helen M, Streets, David G, Sunderland, Elsie M

“…The intentional use of mercury (Hg) in products and processes (“commercial Hg”) has contributed a large and previously unquantified anthropogenic source of Hg…”
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A Global 3‐D Ocean Model for PCBs: Benchmark Compounds for Understanding the Impacts of Global Change on Neutral Persistent Organic Pollutants by Wagner, Charlotte C., Amos, Helen M., Thackray, Colin P., Zhang, Yanxu, Lundgren, Elizabeth W., Forget, Gael, Friedman, Carey L., Selin, Noelle E., Lohmann, Rainer, Sunderland, Elsie M.

“…Human activities have released large quantities of neutral persistent organic pollutants (POPs) that may be biomagnified in food webs and pose health risks to…”
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What Goes Up Must Come Down: Integrating Air and Water Quality Monitoring for Nutrients by Amos, Helen M, Miniat, Chelcy F, Lynch, Jason, Compton, Jana, Templer, Pamela H, Sprague, Lori A, Shaw, Denice, Burns, Doug, Rea, Anne, Whitall, David, Myles, LaToya, Gay, David, Nilles, Mark, Walker, John, Rose, Anita K, Bales, Jerad, Deacon, Jeffrey, Pouyat, Richard

“…Excess nitrogen and phosphorus (“nutrients”) loadings continue to affect ecosystem function and human health across the U.S. Our ability to connect atmospheric…”
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GLOBE Observer Data: 2016-2019 by Amos, Helen M, Starke, Matthew J, Rogerson, Tina M, Robles, Marile Colon, Boger, Rebecca, Campbell, Brian, Low, Russanne D, Nelson, Peder, Overoye, David, Taylor, Jessica E, Weaver, Kristen L, Ferrell, Trena M, Kohl, Holli, Schwerin, Theresa G

“…This technical report summarizes the GLOBE Observer dataset from 1 April 2016 to 1 December 2019. GLOBE Observer is an ongoing NASA-sponsored international…”
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Biogeochemical drivers of the fate of riverine mercury discharged to the global and Arctic oceans by Zhang, Yanxu, Jacob, Daniel J., Dutkiewicz, Stephanie, Amos, Helen M., Long, Michael S., Sunderland, Elsie M.

“…Rivers discharge 28 ± 13 Mmol yr−1 of mercury (Hg) to ocean margins, an amount comparable to atmospheric deposition to the global oceans. Most of the Hg…”
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Global Biogeochemical Implications of Mercury Discharges from Rivers and Sediment Burial by Amos, Helen M, Jacob, Daniel J, Kocman, David, Horowitz, Hannah M, Zhang, Yanxu, Dutkiewicz, Stephanie, Horvat, Milena, Corbitt, Elizabeth S, Krabbenhoft, David P, Sunderland, Elsie M

“…Rivers are an important source of mercury (Hg) to marine ecosystems. Based on an analysis of compiled observations, we estimate global present-day Hg…”
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Observational and Modeling Constraints on Global Anthropogenic Enrichment of Mercury by Amos, Helen M, Sonke, Jeroen E, Obrist, Daniel, Robins, Nicholas, Hagan, Nicole, Horowitz, Hannah M, Mason, Robert P, Witt, Melanie, Hedgecock, Ian M, Corbitt, Elizabeth S, Sunderland, Elsie M

“…Centuries of anthropogenic releases have resulted in a global legacy of mercury (Hg) contamination. Here we use a global model to quantify the impact of…”
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Riverine source of Arctic Ocean mercury inferred from atmospheric observations by Fisher, Jenny A., Jacob, Daniel J., Soerensen, Anne L., Amos, Helen M., Steffen, Alexandra, Sunderland, Elsie M.

“…Methylmercury is a potent neurotoxin that accumulates in aquatic food webs. Human activities, including industry and mining, have increased inorganic mercury…”
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Toward an Assessment of the Global Inventory of Present-Day Mercury Releases to Freshwater Environments by Kocman, David, Wilson, Simon J, Amos, Helen M, Telmer, Kevin H, Steenhuisen, Frits, Sunderland, Elsie M, Mason, Robert P, Outridge, Peter, Horvat, Milena

“…Aquatic ecosystems are an essential component of the biogeochemical cycle of mercury (Hg), as inorganic Hg can be converted to toxic methylmercury (MeHg) in…”
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Atmospheric Concentrations and Wet/Dry Loadings of Mercury at the Remote Experimental Lakes Area, Northwestern Ontario, Canada by St. Louis, Vincent L, Graydon, Jennifer A, Lehnherr, Igor, Amos, Helen M, Sunderland, Elsie M, St. Pierre, Kyra A, Emmerton, Craig A, Sandilands, Ken, Tate, Michael, Steffen, Alexandra, Humphreys, Elyn R

“…Mercury (Hg) is a global pollutant released from both natural and human sources. Here we compare long-term records of wet deposition loadings of total Hg (THg)…”
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Progress on Understanding Atmospheric Mercury Hampered by Uncertain Measurements by Jaffe, Daniel A, Lyman, Seth, Amos, Helen M, Gustin, Mae S, Huang, Jiaoyan, Selin, Noelle E, Levin, Leonard, ter Schure, Arnout, Mason, Robert P, Talbot, Robert, Rutter, Andrew, Finley, Brandon, Jaeglé, Lyatt, Shah, Viral, McClure, Crystal, Ambrose, Jesse, Gratz, Lynne, Lindberg, Steven, Weiss-Penzias, Peter, Sheu, Guey-Rong, Feddersen, Dara, Horvat, Milena, Dastoor, Ashu, Hynes, Anthony J, Mao, Huiting, Sonke, Jeroen E, Slemr, Franz, Fisher, Jenny A, Ebinghaus, Ralf, Zhang, Yanxu, Edwards, Grant

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Historical (1850–2010) mercury stable isotope inventory from anthropogenic sources to the atmosphere by Sun, Ruoyu, Streets, David G., Horowitz, Hannah M., Amos, Helen M., Liu, Guijian, Perrot, Vincent, Toutain, Jean-Paul, Hintelmann, Holger, Sunderland, Elsie M., Sonke, Jeroen E.

“…Abstract Mercury (Hg) stable isotopes provide a new tool to trace the biogeochemical cycle of Hg. An inventory of the isotopic composition of historical…”
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Factors driving mercury variability in the Arctic atmosphere and ocean over the past 30 years by Fisher, Jenny A., Jacob, Daniel J., Soerensen, Anne L., Amos, Helen M., Corbitt, Elizabeth S., Streets, David G., Wang, Qiaoqiao, Yantosca, Robert M., Sunderland, Elsie M.

“…Long‐term observations at Arctic sites (Alert and Zeppelin) show large interannual variability (IAV) in atmospheric mercury (Hg), implying a strong sensitivity…”
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Clouds around the World: How a Simple Citizen Science Data Challenge Became a Worldwide Success by Robles, Marilé Colón, Amos, Helen M., Dodson, J. Brant, Bouwman, Jeffrey, Rogerson, Tina, Bombosch, Annette, Farmer, Lauren, Burdick, Autumn, Taylor, Jessica, Chambers, Lin H.

“…Citizen science is often recognized for its potential to directly engage the public in science, and is uniquely positioned to support and extend participants’…”
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Oxygen isotope exchange with quartz during pyrolysis of silver sulfate and silver nitrate by Schauer, Andrew J., Kunasek, Shelley A., Sofen, Eric D., Erbland, Joseph, Savarino, Joel, Johnson, Ben W., Amos, Helen M., Shaheen, Robina, Abaunza, Mariana, Jackson, Terri L., Thiemens, Mark H., Alexander, Becky

“…RATIONALE Triple oxygen isotopes of sulfate and nitrate are useful metrics for the chemistry of their formation. Existing measurement methods, however, do not…”
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Modelling the mercury stable isotope distribution of Earth surface reservoirs: Implications for global Hg cycling by Sun, Ruoyu, Jiskra, Martin, Amos, Helen M., Zhang, Yanxu, Sunderland, Elsie M., Sonke, Jeroen E.

“…Mercury (Hg) stable isotopes are useful to understand Hg biogeochemical cycling because physical, chemical and biological processes cause characteristic Hg…”
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The GLOBE Spring Cloud Challenge: The Power of Citizen Scientist by Robles, Marilé Colón, Amos, Helen M., Dodson, J. Brant, Bouwman, Jeffrey, Rogerson, Tina, Bombosch, Annette, Farmer, Lauren, Burdick, Autumn, Taylor, Jessica, Chambers, Lin H.

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