Atmos. Chem. Phys. Discuss., 11, 26897-26941, 2011
www.atmos-chem-phys-discuss.net/11/26897/2011/
doi:10.5194/acpd-11-26897-2011
© Author(s) 2011. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Five blind men and an elephant: can NASA Aura measurements quantify the stratosphere-troposphere exchange of ozone flux?
Q. Tang and M. J. Prather
Department of Earth System Science, University of California, Irvine, California, 92697, USA

Abstract. We examine whether the instantaneous ozone (O3) measurements from the four Aura instruments can quantify the stratosphere-troposphere exchange (STE) flux of O3, an important term of the tropospheric O3 budget. Comparing the level 2 (L2) Aura swaths and ozone sondes with the coincident, high-resolution (1°×1°×40-layer×0.5 h) simulations using the University of California, Irvine chemistry transport model (CTM) for years 2005–2006, it is revealed in many cases that all four Aura datasets have some skill in catching the STE process, while missing many of them. Despite a few cases, the individual retrievals in the upper troposphere and lower stratosphere contain too much noise preventing the quantification and integration of STE flux with Aura L2 data. The CTM is applied as a transfer standard to compare with different Aura observations. The statistics of exact matching CTM-Aura comparisons identify the model's high biases in the lower stratosphere and the inconsistency amongst different instruments, such as from tropics to Northern Hemisphere mid-latitudes in July 2005 at 215 hPa and over tropics at 147 hPa for July 2005 and January 2006.

Citation: Tang, Q. and Prather, M. J.: Five blind men and an elephant: can NASA Aura measurements quantify the stratosphere-troposphere exchange of ozone flux?, Atmos. Chem. Phys. Discuss., 11, 26897-26941, doi:10.5194/acpd-11-26897-2011, 2011.
 
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