Seasonal heterogeneity in aerosol types over Dibrugarh-North-Eastern India

Synergistic Approach for the Aerosol Monitoring and Identification of Types over Indo-Gangetic Basin in Pre-Monsoon Season

“…An inverse relationship between AOD and AE (dotted rectangular boxes) is found over both locations (Delhi and Kanpur) i.e., AOD decreases as AE increases and viceversa. This type of inverse relationship shows a trend of increased dust contribution over turbid atmosphere, which also agrees with earlier observations by Kaskaoutis et al (2009) and Pathak et al (2012) for coarse mode dominated aerosol particles. However, some different relationships are also found over both locations (shown in dotted ellipses) which indicate presence of some other aerosol loading sources during the observation period.…”

“…Recently, aerosol classifications were reported using the relationship between AE 440-870 and the difference in AE [Δ AE = AE 440-675 -AE ] including the FMF over a southern city (Hyderabad) of India (Sinha et al, 2012). Pathak et al (2012) have classified five different categories (viz. continental, marine continental, urban-industrial (U-I) and biomass burning (BB), desert dust and mixed type) of aerosols over a city of NorthEastern India using the relationship between AOD 500 and AE.…”

Satellite-based study of physico-optical properties of aerosols over a westernmost location of Brahmaputra valley

“…At 3500m AGL almost all the trajectories are from West Asia, traversing the IGP region for the study location. During pre-monsoon season there is a probability of transport of dust aerosols from Sahara and other African regions to Dibrugarh at 3600m AGL [8] . season do not show a clear pattern and more than 50% trajectories are local over Dibrugarh [8] .…”

“…There is an increasing trend of aerosols over the Indo-Gangetic Plain (IGP) region during pre-monsoon and summer monsoon seasons which is mainly attributed to the combined effects of dust transport and wet deposition of aerosol [4] . Many studies [5][6][7][8] have revealed the aerosol environment over Dibrugarh, a remote continental location in North-East India on the basis of ground based observations. But such report from single location is insufficient to characterize total aerosol environment for the whole region.…”

“…Dibrugarh of North East India [6,8] . West Asian locations and the IGP are the potential source regions, which contribute to total aerosol abundance over Dibrugarh mostly in pre-monsoon and winter season as obtained from trajectory clustering and concentration weighted trajectory analysis [9] .…”