Comparison in Vortex-Based Coordinates of Lower Stratospheric Ozone Measured by the JPL lidars at Table Mountain Facility, CA and Mauna Loa Observatory, HI and by the Aura-MLS

The EOS Microwave Limb Sounder (MLS) onboard Aura started global measurements of stratospheric ozone in August 2004. The Jet Propulsion Laboratory has been operating Differential Absorption Lidars for the long term monitoring of stratospheric ozone since 1989 at Table Mountain Facility, CA (34.4ºN) and 1993 at the NOAA Mauna Loa Observatory, HI (19.5ºN). Stratospheric ozone measured by the JPL lidars and by EOS-MLS will be compared in vortex-based coordinates over the three-year overlap period August 2004- June 2007. In traditional geographic coordinates (Lon-Lat), the agreement between lidar and MLS v1.5 and v2.2 is mostly within 10% in the lower stratosphere. The agreement is expected to improve as vortex-based coordinates are used in the coincidence criteria. Individual comparisons, seasonal and interranual variations as well as meridional transport events will be investigated.