(
2012-05)
Drevnick, Paul E.; Yang, Handong; Lamborg, Carl H.; Rose, Neil L.
In this study we used lake sediments, which faithfully record Hg inputs, to derive estimates of
net atmospheric Hg deposition to Svalbard, Norwegian Arctic. With the exception of one site
affected by local pollution, the study lakes show twofold to fivefold increases in sedimentary Hg
accumulation since 1850, likely due to long-range atmospheric transport and deposition of
anthropogenic Hg. Sedimentary Hg accumulation in these lakes is a linear function of the ratio
of catchment area to lake area, and we used this relationship to model net atmospheric Hg flux:
preindustrial and modern estimates are 2.5±3.3 μg/m2/y and 7.0±3.0 μg/m2/y, respectively. The
modern estimate, by comparison with data for Hg wet deposition, indicates that atmospheric
mercury depletion events (AMDEs) or other dry deposition processes contribute approximately
half (range 0-70%) of the net flux. Hg from AMDEs may be moving in significant quantities
into aquatic ecosystems, where it is a concern because of contamination of aquatic food webs.
