000031207 001__ 31207
000031207 041__ $$aEnglish
000031207 100__ $$aPutero, D.
000031207 245__ $$aSeasonal Variation of Ozone and Black Carbon Observed at Paknajol, an Urban Site in the Kathmandu Valley, Nepal
000031207 260__ $$c2015
000031207 300__ $$a22527-22566
000031207 507__ $$aBhupesh Adhikary, Arnico Pandey, M. Rupakheti, ICIMOD staff, peerreviewed, Atmosphere
000031207 511__ $$aAtmosphere, atarticle
000031207 520__ $$aThe 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 center of the Kathmandu metropolitan city. The diurnal behavior of equivalent black carbon (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 diurnal cycle and 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 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.
000031207 700__ $$aCristofanelli, P.
000031207 700__ $$aMarinoni, A.
000031207 700__ $$aAdhikary, B.
000031207 700__ $$aDuchi, R.
000031207 700__ $$aShrestha, S. D.
000031207 700__ $$aVerza, G. P.
000031207 700__ $$aLandi, T. C.
000031207 700__ $$aCalzolari, F.
000031207 700__ $$aBusetto, M.
000031207 700__ $$aAgrillo, G.
000031207 700__ $$aBiancofiore, F.
000031207 700__ $$aDi Carlo, P.
000031207 700__ $$aPanday, A. K.
000031207 700__ $$aRupakheti, M.
000031207 700__ $$aBonasoni, P.
000031207 773__ $$pAtmos. Chem. Phys. Discuss.
000031207 773__ $$v15 (16)
000031207 773__ $$a10.5194/acpd-15-22527-2015
000031207 8564_ $$uhttp://www.atmos-chem-phys-discuss.net/15/22527/2015/$$yExternal link
000031207 980__ $$aARTICLE