Short-term changes in the aerosol characteristics at Kharagpur (22°19′N, 87°19′E) during winter |
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| Authors: | Prabha R Nair K Susan George K Parameswaran Marina Aloysius Denny P Alappattu Mannil Mohan PK Kunhikrishnan |
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| Institution: | 1. Institute of Environmental Physics, University of Bremen, Otto-Hahn-Allee 1, 28359 Bremen, Germany;2. Finnish Meteorological Institute (FMI), Climate Research Unit, 00101 Helsinki, Finland;3. School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China;4. Key Laboratory of Atmospheric Chemistry (LAC), Chinese Academy of Meteorological Sciences (CAMS), CMA, Beijing, 100081, China;5. The Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100094, China |
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| Abstract: | In-situ measurements of number density, size distribution, and mass loading of near-surface aerosols were carried out at Kharagpur, a site on the eastern part of Indo-Gangetic Plains during the winter month of December 2004. The data have been used to investigate wintertime characteristics of aerosols and their effects on the occurrence of haze. The aerosol number density is found to be of the order of 109 m?3 and mass loading is ~265±70 μg m?3 (5–8 times that reported from south Indian sites). The diurnal patterns and day-to-day variations in aerosol number density and mass loading are closely associated with atmospheric boundary layer height. During haze events, the number density of submicron particles is found to be 2–5 times higher than that during non-hazy period. This could be attributed to the enhanced concentration of anthropogenic aerosols, low atmospheric boundary layer height/ventilation coefficient and airflow convergence. |
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