HR: 0830h
AN: A21D-1005    [PDF]
TI: A Madden-Julian Oscillation in Tropospheric Ozone
AU: * Ziemke, J R
EM: ziemke@jwocky.gsfc.nasa.gov
AF: UMBC GEST, NASA Goddard Space Flight Center, Greenbelt, MD 20771 United States
AU: Chandra, S
EM: chandra@chapman.gsfc.nasa.gov
AF: UMBC GEST, NASA Goddard Space Flight Center, Greenbelt, MD 20771 United States
AB: This is the first study to indicate a Madden-Julian Oscillation (MJO) in tropospheric ozone. Tropospheric ozone is derived using differential measurements of total column ozone and stratospheric column ozone measured from total ozone mapping spectrometer (TOMS) and microwave limb sounder (MLS) instruments. Two broad regions of significant MJO signal are identified in the tropics, one in the western Pacific and the other in the eastern Pacific. Over both regions, MJO variations in tropospheric ozone represent 5-10 DU peak-to-peak anomalies. These variations are significant compared to mean background amounts of 20 DU or less over most of the tropical Pacific. MJO signals of this magnitude would need to be considered when investigating and interpreting particular pollution events since ozone is a precursor of the hydroxyl (OH) radical, the main oxidizing agent of pollutants in the lower atmosphere.
DE: 0322 Constituent sources and sinks
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
DE: 3314 Convective processes
DE: 3374 Tropical meteorology
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting