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| Titel |
Seasonal and spatial comparisons between aerosol and cloud microphysical properties derived from satellite remote sensing in Northeast Asia |
| VerfasserIn |
You-Joon Kim, Byung-Gon Kim, Chang-Hoi Ho, Chang-Keun Song |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250035607
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| Zusammenfassung |
| Mainly MODIS/Terra level 3 and NCEP/NCAR Reanalysis long-term (2001-2008) daily data
have been analyzed for the understanding aerosol-cloud interactions in Northeast Asia, such
as aerosol optical depth (Ïa), liquid-phase cloud optical depth (Ïc), liquid-phase
cloud effective radius (re), cloud fraction (CF), cloud top pressure (CTP), cloud
top temperature (CTT), potential temperature (θ), vertical velocity (w) etc. The
analysis region is divided into 4 regions such as A1 (118-121E & 35-38N), A2
(122-125E & 35-38N), A3 (126-129E & 35-38N), and A4 (130-133E & 35-38N).
Horizontal distributions and box plots of Ïa for the different region showed the
substantial horizontal gradient from China to Korea, especially with the strong
difference between A1~A2 and A3~A4, which could represent the evidence of
the anthropogenic influence downstream of China in the perspective of seasonal
average. Specifically the relationship of Ïa to re on the monthly-average basis has
been examined, which showed the negative correlations, only in summer and rather
significant associations over the Yellow Sea (A2), but mostly ambiguous signals in the
other seasons and/or regions. Relative variability (RV) is defined as normalized
interquartile range being indicative of cloud inherent variability. Relative variability in Ïc
(RVÏc) is overall lowest whereas RVÏa is higher in summer, such that the cloud
variability in summer tends to be relatively suppressed. Especially, the highest ratio of
RVÏa/ RVÏc in summer might represent the favorable condition for the efficient
aerosol-cloud interaction in terms of the long-term spatial & temporal average. Also vertical
gradient of the potential temperature (Îθ) between 700 and 1000hPa is higher in
summer. This might be associated with the location of subsidence zone of Hadley cell.
Interestingly, relationship between Ïaand CF over each region with the different seasons on
low level (CTP>700hPa) liquid-phase (CTT>273K) clouds showed the positive
correlation, more over the A2 region, which are consistent with the 2nd indirect effect. |
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