HR: 1340h
AN: A43A-0876    [Abstracts]
TI: Estimation of the OH column abundance in the lower atmosphere from space- and ground- based measurements.
AU: * Wang, S
EM: shuhui.wang@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
AU: Pickett, H M
EM: Herbert.M.Pickett@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
AU: Pongetti, T J
EM: Thomas.J.Pongetti@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
AU: Cheung, R
EM: publius314@gmail.com
AF: Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, United States
AU: Yung, Y L
EM: yly@gps.caltech.edu
AF: Division of Geological and Planetary Sciences, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, United States
AU: Shim, C
EM: changsub.shim@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
AU: Li, Q
EM: qinbin.li@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
AU: Canty, T
EM: timothy.canty@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
AU: Salawitch, R J
EM: ross.salawitch@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
AU: Jucks, K W
EM: Kenneth.W.Jucks@nasa.gov
AF: Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, United States
AU: Sander, S P
EM: ssander@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, United States
AB: OH measurements by Microwave Limb Sounder (MLS) onboard Aura during 2004 - 2007 are compared with ground-based OH column measurements by Fourier Transform Ultraviolet Spectrometer (FTUVS) over Jet Propulsion Laboratory (JPL)'s Table Mountain Facility (TMF). This is the first comparison of OH measurements from space- and ground-based instruments over seasonal and interannual time scales. The FTUVS measures the OH column abundance from the surface to the top of the atmosphere while MLS measures the OH vertical profile from 21.5 hPa through the mesosphere. MLS OH densities over TMF are integrated vertically to derive partial OH columns for comparison with TMF OH columns. The direct comparison of TMF and MLS columns thus provides an opportunity to study the seasonal variation of the residual OH in troposphere and lower stratosphere. The results are compared with GEOS-Chem OH products below 21.5 hPa, corrected for diurnal variation at Aura overpass times. Balloon and aircraft observations as well as the JPL 1-D photochemical model are employed to estimate the uncertainties in the extrapolated GEOS-Chem partial OH column. The residual OH estimated with GEOS-Chem is also added to the MLS partial OH column to generate a combined total OH column to compare with the TMF total OH column. The results generally agree, especially during summer and early fall when OH levels are high. In winter and early spring with low OH, the former is generally higher than the latter. The correlation of these two groups of data is studied based on least-square linear fits, seasonal T-tests, and contour mapping of the orthogonal chi square. Possible causes of the observed differences will be discussed.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0340 Middle atmosphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting