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| Titel |
Diurnal variations of stratospheric ozone measured by ground-based microwave remote sensing at the Mauna Loa NDACC site: measurement validation and GEOSCCM model comparison |
| VerfasserIn |
A. Parrish, I. S. Boyd, G. E. Nedoluha, P. K. Bhartia, S. M. Frith, N. A. Kramarova, B. J. Connor, G. E. Bodeker, L. Froidevaux, M. Shiotani, T. Sakazaki |
| 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 ; 14, no. 14 ; Nr. 14, no. 14 (2014-07-16), S.7255-7272 |
| Datensatznummer |
250118891
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| Publikation (Nr.) |
 copernicus.org/acp-14-7255-2014.pdf |
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| Zusammenfassung |
| There is presently renewed interest in diurnal variations of stratospheric
and mesospheric ozone for the purpose of supporting homogenization of
records of various ozone measurements that are limited by the technique
employed to being made at certain times of day. We have made such
measurements for 19 years using a passive microwave remote sensing technique
at the Mauna Loa Observatory (MLO) in Hawaii, which is a primary station in the
Network for Detection of Atmospheric Composition Change (NDACC). We have
recently reprocessed these data with hourly time resolution to study diurnal
variations. We inspected differences between pairs of the ozone spectra
(e.g., day and night) from which the ozone profiles are derived to determine
the extent to which they may be contaminated by diurnally varying systematic
instrumental or measurement effects. These are small, and we have reduced
them further by selecting data that meet certain criteria that we
established. We have calculated differences between profiles measured at
different times: morning–night, afternoon–night, and morning–afternoon and
have intercompared these with like profiles derived from the Aura Microwave Limb Sounder (Aura-MLS), the Upper Atmosphere Research Satellite Microwave Limb Sounder (UARS-MLS),
the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES), and Solar Backscatter Ultraviolet version 2 (SBUV/2) measurements. Differences between averages of coincident
profiles are typically < 1.5% of typical nighttime values over
most of the covered altitude range with some exceptions. We calculated
averages of ozone values for each hour from the Mauna Loa microwave data,
and normalized these to the average for the first hour after midnight for
comparison with corresponding values calculated with the Goddard Earth
Observing System Chemistry Climate Model (GEOSCCM). We found that the
measurements and model output mostly agree to better than 1.5% of the
midnight value, with one noteworthy exception: The measured morning–night
values are significantly (2–3 %) higher than the modeled ones from 3.2 to
1.8 hPa (~39–43 km), and there is evidence that the measured
values are increasing compared to the modeled values before sunrise in this
region. |
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