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Overview of Spatial and Temporal Distributions of Speciated Mercury

Overview of Spatial and Temporal Distributions of Speciated Mercury. Huiting Mao Department of Chemistry State University of New York College of Environmental Science and Forestry. Great temporal variabilityies & Large heterogeneous spatial distributions of sources & sinks.

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Overview of Spatial and Temporal Distributions of Speciated Mercury

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  1. Overview of Spatial and Temporal Distributions of Speciated Mercury Huiting Mao Department of Chemistry State University of New York College of Environmental Science and Forestry

  2. Great temporal variabilityies &Large heterogeneous spatial distributions of sources & sinks Distinctly different spatiotemporal variations of Hg0, RGM, and Hgp in various environments: • Marine boundary layer • Land: urban, suburban, rural, remote • High elevation, high altitudes • Latitudinal variation

  3. Marine Boundary Layer 2.25 ng m-3 1.5 ng m-3 Increasing TGM from SH to NH, indicating anthropogenic influence Slemr and Langer, 1992, Nature Oct – Nov 1990

  4. Anthropogenic influence on the coasts NH: 1.746± 0.513 ng m-3SH: 1.471±0.842 ng m-3 Xia et al., 2010, AE Anthropogenic; oxidation; volcanic emissions Kang&Xie et al., 2011, AE

  5. Gulf of Maine Tseng et al., 2012, acp (Mao and Talbot, 2012, acp) Annual max in summer – emissions? Mace head: 1996 - 2009 South China Sea – East Asian Monsoon Ebinghaus et al., 2011, AE Slemr et al., 2008,GRL

  6. (Mao and Talbot, 2012, acp) Tseng et al., 2012 Tropical Pacific Wang et al., 2014, acp Gulf of Maine South China Sea Gulf of Maine Holmes et al, 2009, AE

  7. Urban, Suburban, Rural, Remote Northeastern US rural (Mao and Talbot, 2012, acp) Western US: Jun – Aug 2007 Weiss-Penzias et al., 2009, JGR Nair et al., 2011, AE Southeast US: 2005 - 2008 Urban-industrial Rural Suburb Great Lakes: Jul – Nov 2007 Gratz et al., 2013, STOTEN Chicago Holland

  8. Houston, TX Lan et al., 2014, Atmos. Spring 2009 Nanjing, China Zhu et al., 2012, acp Summer 2009 Summer 2009 US Urban Sub-urban Rural Lan et al., 2012, acp

  9. CAMNet: 1995 - 2005 Temmeet al., 2007, AE The largest declines of 17% and 13% over the study period in Montreal, Toronto, respectively, driven by local to regional emission changes

  10. High elevation, High altitudes Mt. Bachelor 2700 m aslSwartzendruber et al. (2006, JGR) Storm Peak, 3200m aslFain et al., 2009, acp Lulin, 2862 asl Sheu et al., 2010, AE GEM: 1.6 ngm−3, RGM: 20 pgm−3Hgp: 9 pgm−3 Mount Gongga 1640 asl Zhu et al., 2008, J. Mt. Sci.

  11. Grand Bay Intensive, North of Gulf of Mexico Pacific Northwest Springtime Arctic Asian side Mao et al., 2011 CA side Ren et al., 2014, Atmos. Radke et al., 2007 Swartzendruber et al., 2008

  12. Latitudinal Variation Talbot et al., 2008, acp

  13. Long-term Trends Mace Head NH: -1.4 % yr-1 -0.028 ± 0.01 ng m-3 yr-1 SH: -2.7% yr-1 Cape Point: −0.034±0.005 ng m-3 yr-1 Decreased legacy emissions? Ebinghaus et al., 2011, AE Slemr et al., 2011, ACP

  14. Trends in TGM at all sites for 2000–2009 and Mace Head, Ireland for 1996–2009. Alert, 2002 - 2009 Increased RGM in Arctic May, Increased TPM in Arctic spring  Increased oxidation Midlatitudes Sub-Arctic Arctic Cole et al., 2013, acp

  15. Decline of Hgo over the NA Ocean “Caused by decreasing Hg inputs from rivers and wastewater and by changes in the oxidant chemistry of the atmospheric marine boundary layer” Soerensen et al., 2012, GRL

  16. Need to Know: • Global distribution of Hg0, RGM, and HgP • The processes controlling spatiotemporal variabilities in speciated Hg in different environments • Long term trends in Hg0 – causes?

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