Identifying a transport mechanism of dust aerosols over South Asia to the Tibetan Plateau: A case study

Dust aerosol, one of the important light-absorbing impurities in snow and ice sheets Tibet Plateau (TP), can significantly affect magnitude timing melting glacier recession by altering surface albedo. It is thus great importance to understand potential source transport mechanism dust aerosol over TP. A typical storm case, erupted from Thar Desert (ThD) South Asia on 1 4 May 2018, was selected synoptic causes a TP using latest Second Modern-Era Retrospective analysis for Research Applications (MERRA-2) reanalysis data. Comparing with active/passive satellite-based AERONET-based observations, MERRA-2 data provide both spatio-temporal distribution evolution process more accurately. This study also found that entire Indian-Gangetic Plain (IGP), Southern India, Bay Bengal, even were influenced event. The showed caused jointly an upper-level jet stream (ULJS), upper trough subtropical high. south-north secondary circulation adjacent its exit zone, mainly triggered ULJS, promoted much stronger higher vertical uplift aerosols ThD. Consequently, those uplifted particles easily transported across majestic Himalayas southerly airflows front low-pressure Afghanistan southern branch Bengal Bay. These results indicate anthropogenic pollutions constrained driven atmospheric condition are likely be Therefore, it necessary further pay attention influence weather climate downstream areas. • case Tibetan (TP) through two routes. elevates higher. High northward cause event described consistent observations.