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| Titel |
The regional distribution characteristics of aerosol optical depth over the Tibetan Plateau |
| VerfasserIn |
C. Xu, Y. M. Ma, C. You, Z. K. Zhu |
| 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 ; 15, no. 20 ; Nr. 15, no. 20 (2015-10-30), S.12065-12078 |
| Datensatznummer |
250120132
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| Publikation (Nr.) |
 copernicus.org/acp-15-12065-2015.pdf |
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| Zusammenfassung |
| The Tibetan Plateau (TP) is representative of typical clean atmospheric
conditions. Aerosol optical depth (AOD) retrieved by the Multi-angle Imaging
SpectroRadiometer (MISR) is higher over Qaidam Basin than the rest of the TP
throughout the year. Different monthly variation patterns of AOD are observed over
the southern and northern TP, whereby the aerosol load is usually higher in
the northern TP than in the southern part. The aerosol load over the northern
part increases from April to June, peaking in May. The maximum concentration
of aerosols over the southern TP occurs in July. Aerosols appear to be more
easily transported to the main body of the TP across the northern edge rather
than the southern edge. This is maybe partly because the altitude is lower
at the northern edge than that of the Himalayas located along the southern
edge of the TP. Three-dimensional distributions of dust, polluted dust,
polluted continental aerosol and smoke are also investigated, based on Cloud-Aerosol
Lidar and Infrared Pathfinder Satellite Observation (CALIPSO) data. Dust is
found to be the most prominent aerosol type on the TP, and other types of
aerosols affect the atmospheric environment slightly. A dividing line of
higher dust occurrence in the northern TP and lower dust occurrence in the
southern TP can be observed clearly at an altitude of 6–8 km above sea level,
especially in spring and summer. This demarcation appears around
33–35° N in the middle of the plateau, and it is possibly
associated with the high-altitude terrain in the same geographic location.
Comparisons of CALIPSO and MISR data show that the vertical dust occurrences
are consistent with the spatial patterns of AOD. The different seasonal
variation patterns between the northern and southern TP are primarily driven
by atmospheric circulation, and are also related to the emission
characteristics over the surrounding regions. |
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