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| Titel |
Aircraft validation of Aura Tropospheric Emission Spectrometer retrievals of HDO / H2O |
| VerfasserIn |
R. L. Herman, J. E. Cherry, J. Young, J. M. Welker, D. Noone, S. S. Kulawik, J. Worden |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 9 ; Nr. 7, no. 9 (2014-09-25), S.3127-3138 |
| Datensatznummer |
250115910
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| Publikation (Nr.) |
 copernicus.org/amt-7-3127-2014.pdf |
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| Zusammenfassung |
| The EOS (Earth Observing System) Aura Tropospheric Emission Spectrometer (TES) retrieves the
atmospheric HDO / H2O ratio in the mid-to-lower troposphere as well
as the planetary boundary layer. TES observations of water vapor and the HDO
isotopologue have been compared with nearly coincident in situ airborne
measurements for direct validation of the TES products. The field
measurements were made with a commercially available Picarro L1115-i isotopic
water analyzer on aircraft over the Alaskan interior boreal forest during the
three summers of 2011 to 2013. TES special observations were utilized in
these comparisons. The TES averaging kernels and a priori constraints have
been applied to the in situ data, using version 5 (V005) of the TES data.
TES calculated errors are compared with the standard deviation (1σ)
of scan-to-scan variability to check consistency with the TES observation
error. Spatial and temporal variations are assessed from the in situ aircraft
measurements. It is found that the standard deviation of scan-to-scan
variability of TES δD is ±34.1‰ in the boundary layer
and ± 26.5‰ in the free troposphere. This scan-to-scan
variability is consistent with the TES estimated error (observation error) of
10–18‰ after accounting for the atmospheric variations along the
TES track of ±16‰ in the boundary layer, increasing to
±30‰ in the free troposphere observed by the aircraft in situ
measurements. We estimate that TES V005 δD is biased high by an
amount that decreases with pressure: approximately +123‰ at
1000 hPa, +98‰ in the boundary layer and +37‰ in
the free troposphere. The uncertainty in this bias estimate is
±20‰. A correction for this bias has been applied to the TES
HDO Lite Product data set. After bias correction, we show that TES has
accurate sensitivity to water vapor isotopologues in the boundary layer. |
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