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W158357011 abstract "Title of Document: FACTORS INFLUENCING SURFACE ATMOSPHERE EXCHANGE OF GASEOUS ELEMENTAL MERCURY IN WESTERN MARYLAND Christopher Warren Moore, Doctor of Philosophy, 2011 Directed By: Dr. Mark S. Castro Program of Marine, Estuarine, and Environmental Science The purpose of this study was to examine the dynamics of the surface – atmosphere exchange of gaseous elemental mercury (GEM) in western Maryland. The site studied was the Piney Reservoir Ambient Air Monitoring Station (PRAAMS) in Garrett County. I used several different techniques to quantify the exchange, including a soil pore air sampling system that I developed, dynamic flux chambers, and the modified Bowen ratio (MBR) technique. I found that GEM exchange dynamics vary widely from the small scale (< 1 m) of the flux chambers to the large scale of the MBR technique. When I scaled the flux chamber measurements up to the annual time scale, I predicted a net GEM emission of 2.0 to 5.3 μg m yr to the atmosphere from PRAAMS, while with the MBR technique I estimated a GEM deposition of 3.3 μg m y. The differences in these estimates highlight the difficulties with measuring the exchange of a substance that can be both deposited to and emitted from soils. It also shows how uncertain the current estimates of this exchange can be. On the other hand, I was able to quantify soil redox potential as an important driver of GEM fluxes and soil pore total gaseous mercury (TGM) concentrations. This had not been previously reported. I was also able to show the importance of soil organic matter (SOM) and soil pore TGM concentration gradients on the surface –atmosphere exchange of GEM. This work opens the door for other studies on the dynamics of GEM fluxes in all sites with background concentrations of GEM. FACTORS INFLUENCING SURFACE ATMOSPHERE EXCHANGE OF GASEOUS ELEMENTAL MERCURY IN WESTERN MARYLAND" @default.
W158357011 created "2016-06-24" @default.
W158357011 creator A5060216010 @default.
W158357011 date "2011-01-01" @default.
W158357011 modified "2023-09-27" @default.
W158357011 title "FACTORS INFLUENCING SURFACE ATMOSPHERE EXCHANGE OF GASEOUS ELEMENTAL MERCURY IN WESTERN MARYLAND" @default.
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