HR: 11:20h
AN: A42A-05    [Abstracts]
TI: Background Concentrations of Carbon Monoxide: Observed Changes Over the Last Fifteen Years.
AU: Novelli, P c
EM: paul.c.novelli@noaa.gov
AF: NOAA, 325 Broadway, Boulder, CO 80305 United States
AU: * Weatherhead, E C
EM: betsy.weatherhead@noaa.gov
AF: CIRES, 325 Broadway, Boulder, CO 80305 United States
AB: Efforts have been underway during the last two decades to minimize emissions of carbon monoxide into the atmosphere. Carbon monoxide (CO) data from over eighty locations are analyzed to see if they give indications of a reduction in background CO levels. Many of these locations have records beginning in the late 1980's or early 1990's. The data show localized changes that are consistent within regions. In many regions the analysis indicates a small downward trend. However, two large uncertainties remain: have the measurement standards been stable enough? And how much of the changes can be attributed to natural variability including forest fires? These two major uncertainties will be addressed and the evidence for a long-term change in CO will be summarized.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0322 Constituent sources and sinks
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005