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• W2023561655 endingPage "90" @default.
• W2023561655 startingPage "81" @default.
• W2023561655 abstract "Time variability of black carbon (BC) aerosols over different timescales (daily, weekly and annual) is studied over a tropical urban location Hyderabad in India using seven channel portable Aethalometer. The results for the 2-year period (January 2009–December 2010) show a daily-mean BC variability from ~1.00±0.12 µg m−3 to 12.50±3.06 µg m−3, with a remarkable annual pattern of winter high and monsoon low. The BC values maximize during winter (December–January), ~6.67±0.22 µg m−3, and drop during summer (June–August), ~2.36±0.09 µg m−3, which establishes a large seasonal variation. Furthermore, the BC mass concentration exhibits a well-defined diurnal variation, with a morning peak and early afternoon minimum. The magnitude of the diurnal variations is seasonal dependent, which maximizes during the winter months. Air mass back trajectories indicated several different transport pathways, while the concentration weighted trajectory (CWT) analysis reveals that the most important potential sources for BC aerosols are the Indo-Gangetic plain (IGP), central India and some hot spots in Pakistan, Arabian Peninsula and Persian Gulf. The absorbing Ångström exponent (αabs) estimated from the spectral values of absorption coefficient (σabs) ranges from 0.9 to 1.1 indicating high BC/OC ratio typical of fossil fuel origin. The annual average BC mass fraction to composite aerosols is found to be (10±3) % contributing to the atmospheric forcing by (55±10) %. The BC radiative forcing at the atmosphere shows strong seasonal dependency with higher values in winter (33.49±7.01) and spring (31.78±12.89) and moderate in autumn (18.94±6.71) and summer (13.15±1.66). The BC radiative forcing at the top of the atmosphere (TOA) is positive in all months, suggesting an overall heating of the regional climate over Hyderabad." @default.
• W2023561655 created "2016-06-24" @default.
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• W2023561655 date "2013-12-01" @default.
• W2023561655 modified "2023-10-07" @default.
• W2023561655 title "Temporal variability and radiative impact of black carbon aerosol over tropical urban station Hyderabad" @default.
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• W2023561655 doi "https://doi.org/10.1016/j.jastp.2013.08.003" @default.
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