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. This study investigates the influence of the 2015 Calbuco eruption(41.2 ∘  S, 72.4 ∘  W; Chile) on the total columnar aerosoloptical properties over the Southern Hemisphere. The well-known technic ofsun photometry was applied for the investigation of the transport andspatio-temporal evolution of the optical properties of the volcanic plume.The CIMEL sun photometer measurements performed at six South American and three African sites were statistically analysed. This study involves the use ofthe satellite observations and a back-trajectory model. The passage of theCalbuco plume is statistically detectable in the aerosol optical depth (AOD)observations obtained from sun photometer and MODIS observations. This statisticaldetection confirms that the majority of the plume was transported over thenortheastern parts of South America and reached the South African region 1week after the eruption. The plume impacted thesouthern parts of South America to a lesser extent. The highest AOD anomalies were observedover the northeastern parts of South America. Over the South Africansites, the AOD anomalies induced by the spread of the plume were quitehomogeneously distributed between the east and west coasts. The opticalcharacteristics of the plume near the source region were consistent with anash-bearing plume. Conversely, sites further from the Calbuco volcano wereinfluenced by ash-free plume. The optical properties discussed in this paperwill be used as inputs for numerical models for further investigation of theageing of the Calbuco plume in a forthcoming study.

Statistical analysis of the long-range transport of the 2015 Calbuco volcanic plume from ground-based and space-borne observations