HR: 1340h
AN: A53B-1157    [Abstracts]
TI: A Method for the Analysis of Ultra-trace Levels of Semi-volatile and Non-volatile Organic Compounds in Snow and Application to a Greenland Snow Pit
AU: * von Schneidemesser, E
EM: evonschneide@wisc.edu
AF: Environmental Chemistry and Technology Program, University of Wisconsin - Madison, 660 North Park Street, Madison, WI 53706, United States
AU: Schauer, J J
EM: jschauer@wisc.edu
AF: Environmental Chemistry and Technology Program, University of Wisconsin - Madison, 660 North Park Street, Madison, WI 53706, United States
AU: Shafer, M
EM: mmshafer@wisc.edu
AF: Environmental Chemistry and Technology Program, University of Wisconsin - Madison, 660 North Park Street, Madison, WI 53706, United States
AU: Hagler, G
EM: gayle.hagler@ce.gatech.edu
AF: School of Civil and Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332, United States
AU: Bergin, M
EM: mike.bergin@ce.gatech.edu
AF: School of Civil and Environmental Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332, United States
AB: The remote polar regions of the earth yield a valuable resource as an historical record of past atmospheric climate conditions. In addition to climatological conditions, natural and anthropogenic pollution records are archived in the ice and snowpack of these areas. Understanding the depositional patterns and post-depositional processes of the various types of compounds preserved in the snow can help us more accurately interpret long- term data extracted from ice cores, as well as observed short-term changes. Organic compound tracers are useful tools for identifying the sources of aerosol contamination, and, while a significant amount of research has been done to identify these tracers in an aerosol format, their presence and fate in environmental media such as snow is less well documented. To gain a better understanding of the compounds reaching the Greenland ice sheet due to long-range transport, as well as their deposition in the snowpack, a method was developed to quantify a suite of organic compounds from snow meltwater by GC/MS. With this method we are investigating post-depositional changes, including photochemical reactions that may impact classes of organic compounds within the snowpack. A 3 meter deep snow pit was sampled at Summit, Greenland during the summer of 2005. From these samples, profiles representing 3-4 years of deposition were developed for a number of organic compound classes including alkanes, alkanoic acids, polycyclic aromatic hydrocarbons, and hopanes. In addition, previously established methods were used to obtain profiles for total organic carbon, metals, and low molecular weight organic acids.
DE: 0736 Snow (1827, 1863)
DE: 3354 Precipitation (1854)
DE: 9315 Arctic region (0718, 4207)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting