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| Titel |
A multi-sensor upper tropospheric ozone product (MUTOP) based on TES ozone and GOES water vapor: validation with ozonesondes |
| VerfasserIn |
J. L. Moody, S. R. Felker, A. J. Wimmers, G. Osterman, K. Bowman, A. M. Thompson, D. W. Tarasick |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 12 ; Nr. 12, no. 12 (2012-06-29), S.5661-5676 |
| Datensatznummer |
250011291
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| Publikation (Nr.) |
 copernicus.org/acp-12-5661-2012.pdf |
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| Zusammenfassung |
| 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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