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| Titel |
Seasonal variation of ozone and black carbon observed at Paknajol, an urban site in the Kathmandu Valley, Nepal |
| VerfasserIn |
D. Putero, P. Cristofanelli, A. Marinoni, B. Adhikary, R. Duchi, S. D. Shrestha, G. P. Verza, T. C. Landi, F. Calzolari, M. Busetto, G. Agrillo, F. Biancofiore, P. Carlo, A. K. Panday, M. Rupakheti, P. Bonasoni |
| 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. 24 ; Nr. 15, no. 24 (2015-12-17), S.13957-13971 |
| Datensatznummer |
250120233
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| Publikation (Nr.) |
 copernicus.org/acp-15-13957-2015.pdf |
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| Zusammenfassung |
| The Kathmandu Valley in south Asia is considered as one of the global "hot
spots" in terms of urban air pollution. It is facing severe air quality
problems as a result of rapid urbanization and land use change,
socioeconomic transformation, and high population growth. In this paper, we
present the first full year (February 2013–January 2014) analysis of
simultaneous measurements of two short-lived climate forcers/pollutants
(SLCF/P), i.e., ozone (O3) and equivalent black carbon (hereinafter
noted as BC) and aerosol number concentration at Paknajol, in the city center of
Kathmandu. The diurnal behavior of equivalent BC and aerosol number concentration indicated that local pollution
sources represent the major contributions to air pollution in this city. In
addition to photochemistry, the planetary boundary layer (PBL) and wind play
important roles in determining O3 variability, as suggested by the
analysis of seasonal changes of the diurnal cycles and the correlation with
meteorological parameters and aerosol properties. Especially during
pre-monsoon, high values of O3 were found during the afternoon/evening.
This could be related to mixing and entrainment processes between upper
residual layers and the PBL. The high O3 concentrations, in particular
during pre-monsoon, appeared well related to the impact of major open
vegetation fires occurring at the regional scale. On a synoptic-scale
perspective, westerly and regional atmospheric circulations appeared to be
especially conducive for the occurrence of the high BC and O3 values.
The very high values of SLCF/P, detected during the whole measurement
period, indicated persisting adverse air quality conditions, dangerous for
the health of over 3 million residents of the Kathmandu Valley, and the
environment. Consequently, all of this information may be useful for
implementing control measures to mitigate the occurrence of acute pollution
levels in the Kathmandu Valley and surrounding area. |
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