NASA issued a Press Release on Arctic mercury at

http://www.nasa.gov/jpl/news/arctic-mercury-20140115/#.UtbYsPZ96nU
http://www.jpl.nasa.gov/news/news.php?release=2014-012

This is based on a new paper published on Nature which Son V. Nghiem co-authored presenting results from the BROMEX field campaign in 2012.