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| Titel |
Validation of water vapour profiles (version 13) retrieved by the IMK/IAA scientific retrieval processor based on full resolution spectra measured by MIPAS on board Envisat |
| VerfasserIn |
M. Milz, T. v. Clarmann, P. Bernath, C. Boone, S. A. Buehler, S. Chauhan, B. Deuber, D. G. Feist, B. Funke, N. Glatthor, U. Grabowski, A. Griesfeller, A. Haefele, M. Höpfner, N. Kämpfer, S. Kellmann, A. Linden, S. Müller, H. Nakajima, H. Oelhaf, E. Remsberg, S. Rohs, J. M. Russell III, C. Schiller, G. P. Stiller, T. Sugita, T. Tanaka, H. Vömel, K. Walker, G. Wetzel, T. Yokota, V. Yushkov, G. Zhang |
| 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 ; 2, no. 2 ; Nr. 2, no. 2 (2009-07-27), S.379-399 |
| Datensatznummer |
250000556
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| Publikation (Nr.) |
 copernicus.org/amt-2-379-2009.pdf |
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| Zusammenfassung |
| Vertical profiles of stratospheric water vapour measured by the
Michelson Interferometer for Passive Atmospheric Sounding (MIPAS)
with the full resolution mode between September 2002 and March 2004
and retrieved with the IMK/IAA
scientific retrieval processor were compared to a number of
independent measurements in order to estimate the bias and to validate
the existing precision estimates of the MIPAS data.
The estimated precision for MIPAS is 5 to 10% in the stratosphere,
depending on altitude, latitude, and season.
The independent
instruments were: the Halogen Occultation Experiment (HALOE), the
Atmospheric Chemistry Experiment Fourier Transform Spectrometer
(ACE-FTS), the Improved Limb Atmospheric Spectrometer-II (ILAS-II),
the Polar Ozone and Aerosol Measurement (POAM III) instrument, the
Middle Atmospheric Water Vapour Radiometer (MIAWARA), the Michelson
Interferometer for Passive Atmospheric Sounding, balloon-borne version
(MIPAS-B), the Airborne Microwave Stratospheric Observing System
(AMSOS), the Fluorescent Stratospheric Hygrometer for Balloon
(FLASH-B), the NOAA frostpoint hygrometer, and the Fast In Situ
Hygrometer (FISH).
For the in-situ measurements and the ground based, air- and balloon
borne remote sensing instruments, the measurements are restricted
to central and northern Europe. The comparisons to satellite-borne
instruments are predominantly at mid- to high latitudes on both
hemispheres.
In the stratosphere there is no clear indication
of a bias in MIPAS data, because the independent measurements in some
cases are drier and in some cases are moister than the MIPAS
measurements. Compared to the infrared measurements of MIPAS,
measurements in the ultraviolet and visible have a tendency to be
high, whereas microwave measurements have a tendency to be low. The
results of χ2-based precision validation are somewhat
controversial among the comparison estimates.
However, for comparison instruments whose error budget also includes
errors due to uncertainties in spectrally interfering species and
where good coincidences were found, the χ2 values found are in
the expected range or even below. This suggests that there is no
evidence of systematically underestimated MIPAS random errors. |
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