Spatio-Temporal Distributions of the Natural Non-Sea-Salt Aerosol Over the Southern Ocean and Coastal Antarctica and Its Potential Source Regions

• Published in: Tellus B: Chemical and Physical Meteorology
• Main Authors: Heintzenberg, Jost, Legrand, Michel, Gao, Yuan, Hara, Keiichiro, Huang, Shan, Humphries, Ruhi, S, Kamra, Adarsh, K, Keywood, Melita, D, Sakerin, Sergey, M
• Other Authors: Laboratoire Imagerie et Systèmes d'Acquisition (LISA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2023
• Subjects: Southern Ocean Antarctica biogenic marine emissions aerosol sources particle number concentrations particle composition major ions; Southern Ocean; Antarctica; biogenic marine emissions; aerosol sources; particle number concentrations; particle composition; major ions; [SDE]Environmental Sciences; Antarc*
• Online Access: https://hal.science/hal-04261557; https://hal.science/hal-04261557/document; https://hal.science/hal-04261557/file/Tellus-2023.pdf; https://doi.org/10.16993/tellusb.1869

More than 40 years of aerosol data including concentrations of particle number and of nine major ions collected over the Southern Ocean and coastal stations have been aggregated and filtered with back trajectories to reduce the risk of influence from adjacent continents. That provided a rich dataset including latitudinal distribution and seasonality of physical and chemical aerosol parameters that allow insights into aerosol sources over the Southern Ocean. These data together with statistics of back trajectory paths of high (75% percentile) and low (25% percentile) concentrations of the studied aerosol parameters were used to identify potential source regions of the respective compounds. For particle number concentrations, MSA, and the non-seasalt fractions of Ca and potassium the most prominent source regions were found in high DMS-areas close to Antarctica, whereas the potential source regions of NH 4 and the non-sea-salt fraction of Mg were located in part further north over the Southern Ocean. These geographical differences would reflect differences in the marine biota.