Abstract ID: 3.13471 | Not reviewed | Requested as: Talk | TBA | TBA

Whereas temperature anomalies are major factors behind the retreat of glaciers, aerosol influence in regulating local radiative forcing is largely unexamined. The deposition of black carbon (BC) and dust over glacier surfaces diminishes albedo of the snow and boosts absorption of shortwave radiation and fastening the process of melting. This study investigates the interaction of aerosol and glacier in the Himalayas using Aethalometer data from high-altitude observation stations, satellite-based Aerosol Optical Depth (AOD) retrievals from Giovanni, and numerical modeling approaches. BC concentrations derived from Aethalometer-based measurements yield high-resolution information on aerosol variability and its seasonal pattern of transport, diagnosed through the HYSPLIT model in terms of tracing the long-range sources of the pollutants. Quantification of albedo loss through BC and dust loading is made using the SNICAR model to estimate the direct contribution to increased melting. Additionally, meteorological reanalysis data are used to quantify aerosol-induced changes in near-surface temperature and wind patterns. These changed wind patterns can enhance a feedback cycle, encouraging further aerosol transport and further enhance glacier melting. This research provides a quantitative framework to assess how anthropogenic aerosols influence Himalayan glacier retreat beyond global warming alone. By integrating observational data with transport modeling and radiative transfer simulations, we highlight the need for emission mitigation strategies targeting BC sources. The study also underscores the necessity of localized climate action to protect water resources dependent on Himalayan cryosphere stability.