Journal article

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

Moody J, Felker S, Wimmers A, Osterman G, Bowman K, Thompson A, Tarasick D ...see all

Atmospheric Chemistry and Physics, vol. 12, issue 12 (2012) pp. 5661-5676

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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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  • J. L. Moody

  • S. R. Felker

  • A. J. Wimmers

  • G. Osterman

  • K. Bowman

  • A. M. Thompson

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