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| Titel |
The effect of ozone and aerosols on the surface erythemal UV radiation estimated from OMI measurements |
| VerfasserIn |
J. Lee, S. Lee, Y. Hong, C. Song, W. Choi, D. Kim, S. Kim, J. Hong |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250071178
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| Zusammenfassung |
| Surface erythemal UV radiation is mainly affected by total column ozone, aerosols, clouds,
and solar zenith angle. The effect of ozone on the surface UV radiation has been explored
many times in the previous studies due to the decrease of ozone layer. In this study, we
calculated the effect of aerosols on the surface UV radiation as well as that of ozone
using data acquired from Ozone Monitoring Instrument (OMI). First, ozone, aerosol
optical depth (AOD), and surface erythemal UVB radiation measured from satellite
are compared with those from ground measurements. The results showed that the
comparison for ozone was good with r2 of 0.92. For aerosol, there was difference
between satellite measurements and surface measurements due to the insufficient
information on aerosol in the retrieval algorithm. The r2 for surface erythemal UV
radiation was high (~0.93) but satellite measurements showed about 30% larger values
than surface measurements on average by not considering the effect of absorbing
aerosols in the lower atmosphere in the retrieval process from satellite measurements.
Radiative amplification factor (RAF) is used to access the effect of ozone and aerosol
quantitatively. RAF for ozone was 0.97~1.49 with solar zenith angle. To evaluate the effect
of aerosol on the surface UV radiation, only clear-sky pixel data were used and
solar zenith angle and total column amount of ozone were fixed. Also, RAF for
aerosol was assessed according to the single scattering albedo (SSA) of aerosols. The
results showed that RAF for aerosol with smaller SSA (< 0.90) was larger than that
for with larger SSA (> 0.90). The RAF for aerosol was 0.02 ~ 0.08 for the given
conditions which is relatively small compared to that for ozone. However, considering
the fact that aerosol optical depth can change largely in time and space while the
total column amount of ozone does not change very much, it needs to include the
effect of aerosol to predict the variations of surface UV radiation more correctly. |
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