FATE OF MERCURY IN THE ARCTIC Michael Evan ... - COGCI

omine into the near-surface air. When these surface
emissions of photolyzable bromine encounter an airmass
containing Hg 0 emissions from southern latitudes under
sunlight conditions, mercury depletion/deposition events
will occur. The springtime mercury deposition rates in the
Arctic could therefore be related (in the simplest sense) to
a function of the spatial coverage of annual sea ice, the airmass
transport of mercury emissions to this region, and local
airmass circulation. These phenomena are, in turn, controlled
by average spring and summertime temperatures (as a
surrogate for melting multi-year ice), by multi-year ice
coverage (which is decreasing; 65), by synoptic activity
(increasing), and by variations in the position of the polar
front (56, 66). There is a clear need for increased research on
all these phenomena, especially over the Arctic Ocean, to
determine if mercury depletion/oxidation events in the Arctic,
and possibly also in the free troposphere at mid-latitudes
(48, 67), could play an ever increasing role as an important
sink in the global Hg cycle (13, 14).
Acknowledgments
We thank the sponsors of this project for their continued
support [NOAA Office of Arctic Research, and the U.S. EPA
Offices of International Affairs (methods speciation work at
ORNL and Barrow) and Research and Development (BAMS-
2001 aircraft and Hg-p sampling)]; Dan Endres, Malcolm
Gaylord, and Glen McConville for local support at CMDL; F.
Schaedlich for extended help with Tekran equipment; S.
Oltmans for Barrow ozone data; and Lala Chambers, George
Southworth, and Mary Anna Bogle for snow analyses and
data management. GOME spectra have been supplied to A.R.
by the ESA through the German Aerospace Centre (DFD/
DLR Oberpfaffenhofen Germany). The REA system was
developed under the supervision of H. Skov of NERI-DK and
T. Meyers of NOAA. K.J.S. was supported by a scholarship
from the Arctic Institute of North America and by a fellowship
from the University of Manitoba. M.G. is supported by the
Danish Research Agency and the Department of Atmospheric
Environment, NERI-DK. This is Publication No. Hg-72 of
the ORNL Hg Group.
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