Identification of aerosol types over the Indo-Gangetic Basin using ground-based sunphotometer measurements

[ABSTRACT]A discrimination of aerosol types over the Indo-Gangetic Basin (IGB) region during premonsoon period was made using multi-year ground-based sunphotometer measurements. Based on the measured aerosol parameters, five different aerosol types were identified as polluted dust (PD), polluted continental (PC), mostly black carbon (MBC), mostly organic carbon (MOC) and non-absorbing (NA) aerosols at the two typical locations over IGB. Study suggests high dust enriched aerosols (i.e. PD) were contributed more over the central IGB station at Kanpur (~62%) as compared to the eastern IGB station at Gandhi College (~31%). However, opposite was observed for polluted continental aerosols at these two stations, which contain high anthropogenic and less dust aerosols. Contributions of carbonaceous particles having high absorbing (MBC) and low absorbing (MOC) aerosols were found to be ~11% and 10%, respectively at Gandhi College. This was ~46% and 62% higher than the observed contributions at Kanpur. However, very less contribution of NA aerosols was observed only at Gandhi College (2%). Variability in aerosol types together with single scattering albedo (SSA) at both the stations suggests their strong association with emission sources. Results were well substantiated with the air mass back-trajectories and the fire products. The estimated absorption ?ngstr?m exponent (AAE) values suggest relative dominance of absorbing type aerosols over the central part of IGB (due to dominant dust absorption) as compared to the eastern part during pre-monsoon period.

https://opac.ll.chiba-u.jp/da/curator/107457/

https://opac.ll.chiba-u.jp/da/curator/107457/ceresIntlSympo-19-P032.pdf

Chiba University. Center for Environmental Remote Sensing

千葉大学環境リモートセンシング研究センター

会議発表用資料

Proceedings of the CEReS international symposium = CEReS国際シンポジウム資料集

19

32

33

2013-07-04

publisher

環境リモートセンシング研究センター「CEReSシンポジウム資料集」