10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Spatial and Temporal Variation Aspects of Aerosol Black Carbon Concentration over India
RAVI RANJAN KUMAR, Vijay Kumar Soni, Sateesh M., M.K. Jain, Sanjay Bist, Siddhartha Singh, India Meteorological Department
Abstract Number: 642 Working Group: Aerosols in Earth System
Abstract Black Carbon is one of the very important short term climate forcing agents and a little change in its concentration can considerably affect the climate. Considering its importance India Meteorological Department has established a network of 16 Aethalometers (AE-33) for continuous measurement of equivalent black carbon (EBC) concentration over India. In the present study data have been collected at a time stamp of one minute at Amini, Bhuj, Chandigarh, Guwahati, Jodhpur, Kolkata, New Delhi, Nagpur, Pune, PortBlair, Ranchi, Ranichauri, Srinagar, Thiruvanantpuram, Varanasi and Vishakhapatnam stations for the year 2016. The variation of concentrations was examined with ANOVA (analysis of variance) and F-test. ANOVA and F-tests assess the amount of variability between the group means in the context of the variation within groups to determine whether the mean differences are statistically significant. The calculated F value for daily means is 136 and for 16 stations daily mean data we get a degree of freedom (15,5264). On comparing this F value in the Table at a significance level of 0.05 and (15,5264) degree of freedom, it was found that F values is greater than its critical value so null hypothesis is rejected and hence there is a significant variation in the daily mean data of different stations. F values were also calculated for monthly, seasonal and diurnal variations among all 16 stations and it is 8.6, 5.2 and 47.2 respectively. On comparing these F values according to their degree of freedom (15,168), (15,62), (15,368) respectively at 0.05 significance level, all three exceed its critical values and hence showing significant monthly, seasonal and diurnal variation of EBC concentration. North Indian stations are land locked showing higher concentration of black carbon than coastal stations of south India. Mega cities like New Delhi and Kolkata have very high concentration of EBC and apart from these other stations located in Indo-Gangnetic Plane also show high EBC concentration. The annual mean EBC concentration is depicted on geographical map of India. Most of the north Indian stations show high BC concentration during month of November, December and January and minimum during rainy season. Seasonal variation of EBC concentration is also discussed.