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A multi-sensor upper tropospheric ozone product (MUTOP) based on TES ozone and GOES water vapor: Validation with ozonesondes

by J. L. Moody, S. R. Felker, A. J. Wimmers, G. Osterman, K. Bowman, A. M. Thompson, D. W. Tarasick
Atmospheric Chemistry and Physics ()

Abstract

Accurate representation of ozone in the extratropical upper troposphere ({UT)} remains a challenge. However, the implementation of hyper-spectral remote sensing using satellite instruments such as the Tropospheric Emission Spectrometer ({TES)} provides an avenue for mapping ozone in this region, from 500 to 300 {hPa.} As a polar orbiting satellite {TES} observations are limited, but in this paper they are combined with geostationary satellite observations of water vapor. This paper describes a validation of the Multi-sensor {UT} Ozone Product ({MUTOP).} {MUTOP}, based on a statistical retrieval method, is an image product derived from the multiple regression of remotely sensed {TES} ozone, against geostationary ({GOES)} specific humidity (remotely sensed) and potential vorticity (a modeled dynamical tracer in the {UT).} These {TES-derived} {UT} ozone mixing ratios are compared to coincident ozonesonde measurements of layer-average {UT} ozone mixing ratios made during the {NASA} {INTEX/B} field campaign in the spring of 2006; the region for this study is effectively the {GOES} west domain covering the eastern North Pacific Ocean and the western United States. This intercomparison evaluates {MUTOP} skill at representing ozone magnitude and variability in this region of complex dynamics. In total, 11 ozonesonde launch sites were available for this study, providing 127 individual sondes for comparison; the overall mean ozone of the 500-300 {hPa} layer for these sondes was 78.0 ppbv. {MUTOP} reproduces in situ measurements reasonably well, producing an {UT} mean of 82.3 ppbv, with a mean absolute error of 12.2 ppbv and a root mean square error of 16.4 ppbv relative to ozonesondes across all sites. An overall {UT} mean bias of 4.3 ppbv relative to sondes was determined for {MUTOP.} Considered in the context of past {TES} validation studies, these results illustrate that {MUTOP} is able to maintain accuracy similar to {TES} while expanding coverage to the entire {GOES-West} satellite domain. In addition {MUTOP} provides six-hour temporal resolution throughout the {INTEX-B} study period, making the visualization of {UT} ozone dynamics possible. This paper presents the overall statistical validation as well as a selection of ozonesonde case studies. The case studies illustrate that error may not always represent a lack of {TES-derived} product skill, but often results from discrepancies driven by observations made in the presence of strong meteorological gradients.

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