HR: 14:15h
AN: A23D-02    [Abstracts]
TI: QBO and Annual Cycle Variations in Tropical Lower Stratosphere Trace Gases from HALOE and Aura MLS Observations
AU: * Schoeberl, M R
EM: mark.r.schoeberl@nasa.gov
AF: Goddard Space Flight Center, Greenbelt RD., Greenbelt, MD 20771, United States
AU: Douglass, A R
EM: anne.r.douglass@nasa.gov
AF: Goddard Space Flight Center, Greenbelt RD., Greenbelt, MD 20771, United States
AU: Newman, P
EM: paul.a.newman@nasa.gov
AF: Goddard Space Flight Center, Greenbelt RD., Greenbelt, MD 20771, United States
AU: Lait, L
EM: lrlait@ertel.gsfc.nasa.gov
AF: University of Maryland/ Baltimore, 1000 Hilltop Circle, Baltimore, MD 21250, United States
AU: Waters, J
EM: Joe.W.Waters@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Rd., Pasadena, CA 91109, United States
AU: Livesey, N
EM: nathaniel.j.livesey@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Rd., Pasadena, CA 91109, United States
AU: Read, W
EM: william.ready@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Rd., Pasadena, CA 91109, United States
AU: Filipiak, M
EM: mjf@met.ed.ac.uk
AB: Using single value decomposition to fit annual and QBO trace gas variations, we analyze thirteen years (1993 to 2005) of HALOE observations and over two years of EOS MLS observations (Sept. 2004 to Dec. 2006). The results reveal annual and QBO variations in tropical H2O, HCl, ozone N2O, CO, HF and CH4. We use these results to develop the theory explaining both Brewer-Dobson circulation (BDC) and QBO driven fluctuations in tropical trace gases. For H2O and CO, tropopause BDC variations drive part of the tropopause annual forcing, and this signal is carried upward by the mean BDC. For ozone, N2O, HCl and other gases, photochemical processes force fluctuations in the trace gases to be synchronized to the zonal mean residual vertical velocity.
DE: 0340 Middle atmosphere: composition and chemistry
DE: 0341 Middle atmosphere: constituent transport and chemistry (3334)
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly