Historical interrelated variations of mercury and aquatic organic matter in lake sediment cores from a subArctic lake in Yukon, Canada: further evidence toward the algal-mercury scavenging hypothesis

Environmental Science & Technology
Gary A SternP M Outridge

Abstract

This study investigates the role of climate-driven aquatic productivity increases in conrolling the sedimentary accumulation of mercury (Hg) in Kusawa Lake, Yukon, Canada. Organic geochemistry data reveals a significant link between the increasing trends of Hg and of labile algal-derived organic matter (OM) over the centuries and in particular over recent decades. Sedimentary Hg accumulation rates continue to increase even though atmospheric concentrations of Hg have remained the same or even declined. Together, these findings indicate that the significant rise in Hg content recorded in the sediments since the early 1950s may not be representative of increasing atmospheric Hg levels but are strongly influenced by elevated concentrations of algal-derived OM in the water-column. These likely increase the scavenging rate of "available" Hg from the water column. Therefore, recent increases in algal productivity may result in overestimation of the historical rates of atmospheric Hg deposition recorded in the sediments. This study confirms earlier published findings from two High Arctic lakes, and shows that the Hg-OM scavenging hypothesis may also apply to sub-Arctic lakes.

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Citations

Jun 13, 2012·Environmental Science & Technology·Colin A CookeJason P Briner
Jul 6, 2014·The Science of the Total Environment·John ChételatShannon van der Velden
Feb 14, 2012·The Science of the Total Environment·Amanda E PosteRobert E Hecky
Oct 16, 2013·Environmental Toxicology and Chemistry·Séverine Le FaucheurVera I Slaveykova
Apr 23, 2016·The Science of the Total Environment·Paul E DrevnickBrent B Wolfe
Nov 23, 2011·The Science of the Total Environment·Gary A SternChristian Zdanowicz
Oct 1, 2014·Environmental Science and Pollution Research International·Jing YangXiang-Zhou Meng
Oct 1, 2010·Photosynthesis Research·James FarquharAndrey Bekker
Jul 24, 2020·Environmental Monitoring and Assessment·V G GopikrishnaMahesh Mohan
Oct 19, 2020·The Science of the Total Environment·Dandan DuanKe Pan
Dec 31, 2019·The Science of the Total Environment·Colin A CookeMae Sexauer Gustin
Dec 5, 2009·Environmental Science & Technology·J CarrieG A Stern
Jul 12, 2011·Environmental Science & Technology·P M OutridgeR W Macdonald
Mar 2, 2011·Environmental Science & Technology·Vanessa J A PhillipsWilliam O Hobbs
Jan 8, 2011·Environmental Science & Technology·Jane L KirkFan Yang

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