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Speciated Mercury at Marine, Coastal, and Inland Sites in New England – Part 1: Temporal Variability : Volume 11, Issue 12 (08/12/2011)

By Mao, H.

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Book Id: WPLBN0003995803
Format Type: PDF Article :
File Size: Pages 36
Reproduction Date: 2015

Title: Speciated Mercury at Marine, Coastal, and Inland Sites in New England – Part 1: Temporal Variability : Volume 11, Issue 12 (08/12/2011)  
Author: Mao, H.
Volume: Vol. 11, Issue 12
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Talbot, R., & Mao, H. (2011). Speciated Mercury at Marine, Coastal, and Inland Sites in New England – Part 1: Temporal Variability : Volume 11, Issue 12 (08/12/2011). Retrieved from http://worldlibrary.in/


Description
Description: Department of Chemistry, State University of New York, College of Environmental Science and Technology, Syracuse, NY 13219, USA. A comprehensive analysis was conducted using long-term continuous measurements of gaseous elemental mercury (Hgo), reactive mercury (RGM), and particulate phase mercury (HgP) at coastal (Thompson Farm, denoted as TF), marine (Appledore Island, denoted as AI), and elevated inland (Pac Monadnock, denoted as PM) sites from the AIRMAP Observatories. Decreasing trends in background Hgo were identified in the 7- and 5-yr records at TF and PM with decline rates of 3.3 parts per quadrillion by volume (ppqv) yr−1 and 6.3 ppqv yr−1, respectively. Common characteristics at these sites were the reproducible annual cycle of Hgo with its maximum in winter-spring and minimum in fall as well as a decline/increase trend in the warm/cool season. The coastal site TF differed from the other two sites with its exceptionally low levels (as low as below 50 ppqv) in the nocturnal inversion layer probably due to dissolution in dew water. Year-to-year variability was observed in the warm season decline in Hgo at TF varying from a minimum total seasonal loss of 20 ppqv in 2010 to a maximum of 92 ppqv in 2005, whereas variability remained small at AI and PM. Measurements of Hgo at PM, an elevated inland rural site, exhibited the smallest diurnal to annual variability among the three environments, where peak levels rarely exceeded 250 ppqv and the minimum was typically 100 ppqv. It should be noted that summertime diurnal patterns at TF and AI are opposite in phase indicating strong sink(s) for Hgo during the day in the marine boundary layer, which is consistent with the hypothesis of Hgo oxidation by halogen radicals there. Mixing ratios of RGM in the coastal and marine boundary layers reached annual maximum in spring and minimum in fall, whereas at PM levels were generally below the limit of detection (LOD) except in spring. RGM levels at AI were higher than at TF and PM indicating a stronger source strength(s) in the marine environment. Mixing ratios of HgP at AI and TF were close in magnitude to RGM levels and were mostly below 1 ppqv. Diurnal variation in HgP was barely discernible at TF and AI in spring and summer with higher levels during the day and smaller but above the LOD at night.

Summary
Speciated mercury at marine, coastal, and inland sites in New England – Part 1: Temporal variability

Excerpt
Cole, A. S. and Steffen, A.: Trends in long-term gaseous mercury observations in the Arctic and effects of temperature and other atmospheric conditions, Atmos. Chem. Phys., 10, 4661–4672, doi:10.5194/acp-10-4661-2010, 2010.; Ebinghaus, R., Kock, H. H., Coggins, A. M., Spain, T. G., Jennings, S. G., and Temme, C.: Long-term measurements of atmospheric mercury at Mace Head, Irish west coast, between 1995 and 2001, Atmos. Environ., 36, 5267–5276, 2002.; Ebinghaus, R., Jennings, S. G., Kock, H. H., Derwent, R. G., Manning, A. J., and Spain, T. G.: Decreasing trend in total gaseous mercury observations in baseline air at Mace Head, Ireland, from 1996 to 2009, Atmos. Environ., 45, 3475–3480, 2011.; Feddersen, D. M., Talbot, R., and Mao, H.: Size distribution of particulate mercury in marine and continental atmospheres, Atmosphere, in preparation, 2011.; Fu, X., Feng, X., Zhu, W., Zheng, W., Wang, S., and Lu, J. Y.: Total particulate and reactive gaseous mercury in ambient air on the eastern slope of the Mt. Gongga, China, Appl. Geochem., 23, 408–418, 2008.; Kim, S. Y.: Continental outflow of polluted air from the U.S. to the North Atlantic and mercury cycling in various Atmospheric environments, Ph.D. dissertation, 114 pp., University of New Hampshire, September 2010.; Landis, M. S., Stevens, R. K., Schaedlich, F., and Prestbo, E. M.: Development and characterization of an annular denuder methodology for the measurement of divalent inorganic reactive gaseous mercury in ambient air, Environ. Sci. Technol., 36, 3000–3009, 2002.; Laurier, F. J. G., Mason, R. P., and Whalin, L.: Reactive gaseous mercury formation in the North Pacific Ocean's marine boundary layer: A potential role of halogen chemistry, J. Geophys. Res., 108, 4529, doi:10.1029/2003JD003625, 2003.; Laurier, F. and Mason, R.: Mercury concentration and speciation in the coastal and open ocean boundary layer, J. Geophys. Res., 112, D06302, doi:10.1029/2006JD007320, 2007.; Lombard, M. A. S., Bryce, J. G., Mao, H., and Talbot, R.: Mercury deposition in Southern New Hampshire, 2006–2009, Atmos. Chem. Phys., 11, 7657–7668, doi:10.5194/acp-11-7657-2011, 2011.; Mason, R. P. and Sheu, G.-R.: Role of the ocean in the global mercury cycle, Global Bio. Cycles, 16, 1093, doi:10.1029/2001GB001440, 2002.; Mason, R. P., Laurier, F. J. G., Whalin, L., and Sheu, G.–R.: The role of ocean-atmosphere exchange in the global mercury cycle, J. Phys. IV France, 107, 835–838, doi:10.1051/jp4:20030428, 2003.; Mao, H. and Talbot, R.: O3 and CO in New England: Temporal variations and relationships, J. Geophys. Res., 109, D21304, doi:10.1029/2004JD004913, 2004.; Mao, H. and Talbot, R.: Long-term variation in speciated mercury at marine, coastal and inland sites in New England – Part 3: Relationships with Atmospheric Chemical Compounds, to be submitted to Atmos. Chem. Phys. Discuss., 2011.; Mao, H., Talbot, R. W., Sigler, J. M., Sive, B. C., and Hegarty, J. D.: Seasonal and diurnal variations of Hg$^{\rm o}$ over New England, Atmos. Chem. Phys., 8, 1403–1421, doi:10.5194/acp-8-1403-2008, 2008.; Schroeder, W. H. and Munthe, J.: Atmospheric mercury – an overview, Atmos. Environ., 5, 809–822, 1998.; Mao, H., Talbot, R., Hegarty, J., and Koermer, J.: Speciated mercury at marine, coastal, and inland sites in New England – Part 2: Relationships with atmospheric physical parameters, Atmos. Chem. Phys. Discuss., 11, 28395–28443,

 

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