HR: 08:30h
AN: A21D-03    [Abstracts]
TI: The atmospheric boundary layer and its effect on NO concentrations during ANTCI-2003
AU: * Neff, W
EM: william.neff@noaa.gov
AF: NOAA Environmental Technology Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Helmig, D
AF: University of Colorado, Institute for Arctic and Alpine Research, Campus Box 450, Boulder, CO 80309 United States
AU: Davis, D
AF: Georgia Institute of Technology, Earth & Atmospheric Sciences, P.O. Box 0340, Atlanta, GA 30332 United States
AU: Buhr, M
AF: Sonoma Technology, 1360 Redwood Way, Suite C, Petaluma, CA 94954 United States
AU: Gottas, D
AF: Cooperative Institute for Research in the Environmental Sciences c/o NOAA/ETL, 325 Broadway, Boulder, CO 80305 United States
AU: Grachev, A
AF: Cooperative Institute for Research in the Environmental Sciences c/o NOAA/ETL, 325 Broadway, Boulder, CO 80305 United States
AU: Oncley, S
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307 United States
AU: Warshawsky, M
AF: Azeotech, 443 Allison St., Ashland, OR 97520 United States
AB: The Antarctic Tropospheric Chemistry Investigation (ANTCI) field program, during November and December 2003 at the South Pole, deployed a number of measurement systems to document the behavior of the atmospheric boundary layer (ABL) and the associated chemical processes that lead to high values of NO. These measurements included an acoustic sounder to provide continuous measurements of the ABL through the entire experimental period. During a special observing period from December 13 to 30, a sonic anemometer was used to measure the surface fluxes of momentum and heat together with a tethered balloon that profiled NO, O3 and meteorological variables (see Helmig et al., this conference). Our analysis has focused on developing a comprehensive picture of the ABL and the meteorological processes that control its behavior. We used both meteorological and chemical data to trace the evolution of the ABL through transitions between well-mixed states (deeper than 200m) and ones with very shallow mixing layers (20 to 30 m) characterized by strongly suppressed turbulence and low-level jets (30 to 40 m above the surface).
DE: 3349 Polar meteorology
DE: 3360 Remote sensing
DE: 3307 Boundary layer processes
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting