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| Titel |
Characterization of ozone profiles derived from Aura TES and OMI radiances |
| VerfasserIn |
D. Fu, J. R. Worden, X. Liu, S. S. Kulawik, K. W. Bowman, V. Natraj |
| 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 ; 13, no. 6 ; Nr. 13, no. 6 (2013-03-26), S.3445-3462 |
| Datensatznummer |
250018542
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| Publikation (Nr.) |
 copernicus.org/acp-13-3445-2013.pdf |
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| Zusammenfassung |
| We present satellite based ozone profile estimates derived by combining
radiances measured at thermal infrared (TIR) wavelengths from the Aura
Tropospheric Emission Spectrometer (TES) and ultraviolet (UV) wavelengths
measured by the Aura Ozone Monitoring Instrument (OMI). The advantage of
using these combined wavelengths and instruments for sounding ozone over
either instrument alone is improved sensitivity near the surface as well as
the capability to consistently resolve the lower troposphere, upper
troposphere, and lower stratosphere for scenes with varying geophysical
states. For example, the vertical resolution of ozone estimates from either
TES or OMI varies strongly by surface albedo and temperature. Typically, TES
provides 1.6 degrees of freedom for signal (DOFS) and OMI provides less than
1 DOFS in the troposphere. The combination provides 2 DOFS in the
troposphere with approximately 0.4 DOFS for near surface ozone (surface to
700 hPa). We evaluated these new ozone profile estimates with ozonesonde
measurements and found that calculated errors for the joint TES and OMI
ozone profile estimates are in reasonable agreement with actual errors as
derived by the root-mean-square (RMS) difference between the ozonesondes and
the joint TES/OMI ozone estimates. We also used a common a priori profile in
the retrievals in order to evaluate the capability of different retrieval
approaches on capturing near-surface ozone variability. We found that the
vertical resolution of the joint TES/OMI ozone profile estimates shows
significant improvements on quantifying variations in near-surface ozone
with RMS differences of 49.9% and correlation coefficient of R = 0.58
for the TES/OMI near-surface estimates as compared to 67.2% RMS
difference and R = 0.33 for TES and 115.8% RMS difference and R =
0.09 for OMI. This comparison removes the impacts of using the
climatological a priori in the retrievals. However, it results in
artificially large sonde/retrieval differences. The TES/OMI ozone profiles
from the production code of joint retrievals will use climatological a
priori and therefore will have more realistic ozone estimates than those from
using a common a priori volume mixing ratio profile. |
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