Document Detail

Mercury Export from the Yukon River Basin and Potential Response to a Changing Climate.
MedLine Citation:
PMID:  21910490     Owner:  NLM     Status:  Publisher    
We measured mercury (Hg) concentrations and calculated export and yield from the Yukon River Basin (YRB) to quantify Hg flux from a large, permafrost-dominated, high-latitude watershed. Exports of Hg averaged 4400 kg Hg yr-1. The average annual yield for the YRB during the study period was 5.17 ug m-2 yr-1, which is 3 to 32 times more than Hg yields reported for 8 other major northern hemisphere river basins. The vast majority (90%) of Hg export is associated with particulates. Half of the annual export of Hg occurred during the spring with about 80% of 34 samples exceeding the US EPA Hg standard for adverse chronic effects to biota. Dissolved and particulate organic carbon exports explained 81% and 50%, respectively, of the variance in Hg exports, and both were significantly (p<0.001) correlated with water discharge. Recent measurements indicate that permafrost contains a substantial reservoir of Hg. Consequently climate warming will likely accelerate the mobilization of Hg from thawing permafrost increasing the export of organic-carbon associated Hg, and thus potentially exacerbating the production of bioavailable methylmercury from permafrost-dominated northern river basins.
Paul F Schuster; Robert G Striegl; George R Aiken; David P Krabbenhoft; John F Dewild; Kenna Butler; Ben Kamark; Mark Dornblaser
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-9-12
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-9-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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