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| Titel |
Accuracy of Ground-based measurements in polar vortex conditions: Comparison to TOMS/OMI observations during 1979-2013 |
| VerfasserIn |
Pankaj Kumar, Jayanarayanan Kuttippurath, Prijitha J. Nair, Arun Chakroborty |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250146293
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| Publikation (Nr.) |
 EGU/EGU2017-10311.pdf |
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| Zusammenfassung |
| We estimate the bias and drifts of ground-based total column ozone (TCO) measurements for
11 stations in Antarctica, with the observations carried out in winter/spring conditions inside
the polar vortex during 1979-2013 period. This is the first comparison exercise in the polar
vortex conditions. The ground-based measurements (GBM) from Dobson, Brewer, SAOZ and
DOAS spectrometers were used for the analysis. In general, the GBMs show good
agreement with satellite measurements at all stations for each instrument where
correlation is higher than 0.94. Although bias between GBM and satellite measurements
are generally station dependent, SAOZ shows relatively large and Dobson shows
relatively small bias. There is no specific pattern in drifts and are within ±0.09% at all
stations with Dobson showing the least and DOAS exhibiting the highest drift. The
relative difference (RD) between Satellite and ground based measurements show
dependence on satellite solar zenith angle (SZA) (except Dobson) and temperature (except
Dobson and SAOZ) and thus also contributing to the bias in the measurements. |
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