ISCAT 1998 Field Season South Pole Observations of NO, OH, MSA, H2SO4, DMS, SO2,and NMHC

Douglas D. Davis 221 Bobby Dodd Way School of Earth and Atmospheric Sciences Georgia Institute of Technology Atlanta, GA 30332 Phone: 404-894-4008 Fax: 404-894-1998 E-mail: dd16@prism.gatech.edu The ISCAT 1998 field observations went from late November, 1998 to early January, 1999 at the south pole. The measured trace gases includes: NO, OH, MSA, H2SO4, DMS, and SO2. Most of ISCAT gas phase sampling (i.e., NO, OH, MSA, H2SO4, DMS, and SO2) was from the second floor of the Atmospheric Research Observatory (ARO) building.

The sampling lines extended 1 - 2 m from the building and were about 10 meter above the snow surface. Sampling from the ARO building was from that side of the building facing the prevailing wind. This typically was out of the "clean air sector" (0 - 120�, e.g., see Davis et al. GRL, October 1, 2001).