U.S.Geological Survey, 5957 Lakeside Boulevard, Indianapolis, IN 46278, USA.
Environ Pollut. 2012 Feb;161:261-71. doi: 10.1016/j.envpol.2011.05.030. Epub 2011 Jul 13.
Annual and weekly mercury (Hg) concentrations, precipitation depths, and Hg wet deposition in the Great Lakes region were analyzed by using data from 5 monitoring networks in the USA and Canada for a 2002-2008 study period. High-resolution maps of calculated annual data, 7-year mean data, and net interannual change for the study period were prepared to assess spatial patterns. Areas with 7-year mean annual Hg concentrations higher than the 12 ng per liter water-quality criterion were mapped in 4 states. Temporal trends in measured weekly data were determined statistically. Monitoring sites with significant 7-year trends in weekly Hg wet deposition were spatially separated and were not sites with trends in weekly Hg concentration. During 2002-2008, Hg wet deposition was found to be unchanged in the Great Lakes region and its subregions. Any small decreases in Hg concentration apparently were offset by increases in precipitation.
利用美国和加拿大 5 个监测网络在 2002-2008 年研究期间的数据，分析了大湖区的年际和周际汞（Hg）浓度、降水量和 Hg 湿沉降。制作了计算得出的年数据、7 年平均值数据和研究期间净年际变化的高分辨率地图，以评估空间模式。根据 12 纳克/升水质标准，将 Hg 浓度高于 7 年平均值的 4 个州的区域绘制在地图上。统计确定了测量的周际数据的时间趋势。Hg 湿沉降的周际数据具有显著 7 年趋势的监测站点在空间上是分开的，并且与周际 Hg 浓度的趋势站点不同。在 2002-2008 年期间，大湖区及其次区域的 Hg 湿沉降没有变化。Hg 浓度的任何微小下降显然都被降水量的增加所抵消。
