The Government of Canada guidelines on mercury in drinking water has a lot of information:
Guidelines for Canadian Drinking Water Quality - Mercury
This might be a helping paper, http://link.springer.com/article/10.1007%2Fs00128-010-0059-0.
The paper is in copyright. I need details. Please send me whole paper if possible.
The attachment containing 3 tables( with names of seas/ oceans/ Hg level) and 16 references may prove helpful.Of course, no excellence is proclaimed on my part as primarily we, all ,are participating in an academic discussion where every body is a winner. Rgds.
it is not clear why atmospheric Hg levels have decreased more rapidly at sub-Arctic and temperate locations than at a polar location. GEM trends in polar regions would reflect any changes in local chemistry (e.g., AMDEs), local emissions, or altered transport of polluted air from lower latitudes as well as trends in hemispheric background GEM.
http://emrlibrary.gov.yk.ca/INAC_Mercury_Report.pdf
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