10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Understanding the High-Resolution Size Distribution of Organic Species over the Indo-Gangetic Plain
NAVANEETH M. THAMBAN, S.N. Tripathi, Bhuvana Joshi, Donna Sueper, Manjula Canagaratna, IIT Kanpur
Abstract Number: 273 Working Group: Aerosol Chemistry
Abstract Detailed understanding of the size distribution of organic species in Indo-Gangetic Plain (IGP) at winter period is very important due to their complexity in origin and atmospheric processing. High-Resolution Particle Time of Flight (HR-PToF) size distribution analysis was performed on the High-Resolution Time of Flight Aerosol Mass Spectrometer (HR-ToF-AMS) derived organics data to identify the size distribution of various organic proxies and their relative modes. HR-PToF size distributions of Unit Mass Resolution (UMR) organic proxies (SVOOA, COA and, HOA) show a distinct mode of primary and secondary organic families. The relative abundance of this primary (CH) and secondary (CHO) organic families in a specific UMR proxy can influence its size distribution mode in UMR analysis. The diurnal variation of the mid-modal diameter indicates that the HOA, COA, BBOA are showing a diurnal growth (increase in the mid modal diameter) during the daytime, where, the highly oxygenated LVOOA shows no increase in its mid-modal diameter throughout the day.