Single Particle Measurements and Clustering Analysis from Winter Fog Events in the Indo-Gangetic Plain

Intense fog events have been observed during winter months over the Indo-Gangetic Plain. The overall composition of the fog and aerosol particles before, during, and after these events plays a crucial role in the potential heterogeneous and aqueous-phase reactions occurring over the region. The lifetime, transport, and human-health impacts of the aerosols in these intense fog events can be altered but the extent of the changes remain unclear. This presentation focuses on single particle composition data of submicron particles obtained from a mini Aerosol Mass Spectrometer (AMS) during the NAMASTE2 campaign deployment to Lumbini, Nepal. Bulk AMS data shows organic species dominate the mass with significant enhancements in aerosol chloride exceeding sulfate during fog events. Single particle analysis from AMS measurements, including k-means cluster analysis, is presented here to interpret mixing state of the submicron aerosol mass population.