Regional precipitation mercury trends in the eastern USA, 1998-2005: Declines in the Northeast and Midwest, no trend in the Southeast

被引:51
作者
Butler, Thomas J. [1 ]
Cohen, Mark D. [1 ]
Vermeylen, Frangoise M. [2 ]
Likens, Gene E. [3 ]
Schmeltz, David [4 ]
Artz, Richard S. [1 ]
机构
[1] NOAA, Air Resources Lab, Silver Spring, MD 20910 USA
[2] Cornell Univ, Off Stat Consulting, Ithaca, NY USA
[3] Inst Ecosyst Studies, Millbrook, NY 12545 USA
[4] US EPA, Clean Air Markets Div, Washington, DC 20460 USA
关键词
mercury wet deposition; mercury emissions; mercury precipitation concentration;
D O I
10.1016/j.atmosenv.2007.10.084
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Mercury emissions in the USA declined between the 1990s and the beginning of this decade, largely due to the closure of municipal and medical waste incinerators. Declines in emissions have been greater in the Northeastern (NE) than the Midwestern (MW), and Southeastern (SE) regions of the eastern USA. During this time, global emissions of mercury have declined in Europe but have not declined in Asia and Africa. We have examined the patterns and trends in annual volume-weighted mean precipitation concentration for 33 Mercury Deposition Network (MDN) sites in the eastern USA, for the period 1998-2005. Individual linear regressions indicate that, I I of 12 sites in the NE and all nine sites in the MW show declining patterns in mercury concentration, but only nine of these 21 sites show statistically significant downward trends (p<0.10). For the SE, seven of 12 sites show a decreasing pattern, but only two sites show significant downward trends (p<0.10). Random coefficient models were used to test the trends in mercury concentration for each of the three regions as a whole. These results for the NE and the MW are statistically significant (p<0.01), and show annual declines of -1.70 +/- 0.51% (S.E.) per year, and -3.52 +/- 0.74% per year for the NE and MW, respectively. The SE region as a whole shows no significant trend in mercury concentration during the same period. Different mercury transformation and deposition processes in the SE may account for these results. A comprehensive mercury emissions record was not available for the same 1998-2005 time period as the precipitation concentration analysis. Therefore, while the empirical relation between changing regional mercury emissions and changing precipitation mercury concentrations is suggestive, it cannot be confidently assessed at this time. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1582 / 1592
页数:11
相关论文
共 36 条
[1]  
[Anonymous], EPA823R01001 OFF WAT
[2]  
BUTLER T, 2007, MERCURY ENV PATTERNS, P85
[3]   The impact of changing nitrogen oxide emissions on wet and dry nitrogen deposition in the northeastern USA [J].
Butler, TJ ;
Likens, GE ;
Vermeylen, FM ;
Stunder, BJB .
ATMOSPHERIC ENVIRONMENT, 2005, 39 (27) :4851-4862
[4]   Modeling the atmospheric transport and deposition of mercury to the Great Lakes [J].
Cohen, M ;
Artz, R ;
Draxler, R ;
Miller, P ;
Poissant, L ;
Niemi, D ;
Ratté, D ;
Deslauriers, M ;
Duval, R ;
Laurin, R ;
Slotnick, J ;
Nettesheim, T ;
McDonald, J .
ENVIRONMENTAL RESEARCH, 2004, 95 (03) :247-265
[5]  
COHEN MD, 2007, REPORT C MERCURY CON, P162
[6]  
Council NR., 2000, Toxicological effects of methylmercury
[7]  
*ENV CAN, 2004, MERC EM DAT YEAR 200
[8]  
Environment Canada, 2007, NAT POLL REL INV NPR
[9]  
*EPRI, 2004, ATM MERC RES UPD FIN
[10]   Biological mercury hotspots in the northeastern United States and southeastern Canada [J].
Evers, David C. ;
Han, Young-Ji ;
Driscoll, Charles T. ;
Kamman, Neil C. ;
Goodale, M. Wing ;
Lambert, Kathleen Fallon ;
Holsen, Thomas M. ;
Chen, Celia Y. ;
Clair, Thomas A. ;
Butler, Thomas .
BIOSCIENCE, 2007, 57 (01) :29-43