12-14 September, 2011, Lucknow - Earth Science India

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National Conference on Science of Climate Change and Earth’s Sustainability: Issues and Challenges ‘A Scientist-People Partnership’ 12-14 September, 2011, Lucknow shows the incoming flux of dust from the western desert region. The study found enhancement of Aerosol over the IG-basins during the period of dust storms. VARIATION OF AEROSOL OPTICAL DEPTH OVER VARANASI LOCATED IN INDO-GANGETIC BASIN S. Tiwari, Amit K. Singh and A.K. Singh * Atmospheric Research Lab, Department of Physics, Banaras Hindu University, Varanasi-221005. *email: abhay_s@rediffmail.com Aerosols are tiny particles suspended in air either in solid or liquid form and play a very important role in global climate change and their radiative forcing on climate. The diurnal and seasonal variability of aerosol optical depth (AOD) is very important for the study of aerosol interaction with pressure, temperature and cloud. At Varanasi, located in the heart of Indo-Gangetic Basin (IGB), we are using the pair of MICROTOPS, manufactured by the solar light company Philadelphia, USA for measuring the aerosol optical depth (AOD) and metrological parameters like temperature, pressure and water vapor. The paper analyzes six month data from January to June 2011 to study the variation of AOD over Varanasi and its relation with meteorological parameters. We compared these ground observed AOD with that of satellite derived data using MODIS onboard Terra satellite. We also used LAMP (Lidar for Atmospheric Measurement and Probing) for the study of boundary layer dynamics of aerosol distribution over Varanasi and detected haze layers over Varanasi during winter session. The results are discussed as the variability of AOD over the IGB. BIAEROSOL: A NEW RESEARCH PERSPECTIVE IN CLIMATE CHANGE Ranjit Kumar 1* and J.N. Srivastava 2 and Poornima Jain 3 1 Department of Chemistry, Technical College, 2 Department of Botany, Faculty of Science 3 Department of LLE, Faculty of Social Science Dayalbagh Educational Institute, Dayalbagh, Agra-5 *email: rkschem@rediffmail.com Atmospheric particulates have significant implications for climate change and human health. The particulate emitted from different sources and suspended in the air 30
National Conference on Science of Climate Change and Earth’s Sustainability: Issues and Challenges ‘A Scientist-People Partnership’ 12-14 September, 2011, Lucknow constitutes biotic (biological) and abiotic (non biological) components both. Presence of biological constituents in the particulate matter increases number of cloud drops and decreases the rain intensity and also causes incidences of infectious diseases resulted into the attraction of scientific community worldwide towards the biological study of aerosol. But in India little attention has been given so far in-spite of this fact that 40% Indian population living on the bank of Indo-Gangetic plain are experiencing a large number of diseases like asthama, bronchitis, malaria, chickengunia, monkeygunia and other respiratory and cardiovascular diseases. The present study deals with biochemical characterization of aerosol at Dayalbagh, Agra, a suburban site of India. Biological concentration increases with increase in the level of particulate matter and there have been differences in the types of species. Chemical characterizations of aerosols were also carried out with aim to study the level of tracer species as they are known to exacerbate the biological activities. STUDY OF PLASMA BUBBLES USING GPS DATA AT LOW LATITUDE GROUND STATION VARANASI S. Priyadarshi, S. Kumar and A.K. Singh Atmospheric Research Lab., Department of Physics, BHU, Varanasi-221005 Equatorial Plasma Bubbles (EPBs) are plasma density depletions and accompanying plumes of irregularities that give rise to severe radio signal disruptions. These ionospheric irregularities not only can reduce the accuracy of GPS/Satellite Based Augmentation System (SBAS) receiver pseudo-range and carrier phase measurement but also can result in a complete loss of lock on a satellite. To study the characteristics of ionospheric plasma bubbles during the solar minimum period, we have analyzed the GPS based measurements of Slant Total Electron Content (STEC) data using method of Portillo et al. (2008) from May 2007 to May 2011. It is observed the equatorial plasma bubbles of duration 61 to 176 minutes and maximum depletion in the density of plasma bubble of 8.04 TEC units. The maximum occurrence of plasma bubbles has been observed in equinox months for each year. These observations of plasma bubbles are discussed with other reported results. 31
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12-14 September, 2011, Lucknow - Earth Science India

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