Ozone depletion in the Antarctic region triggers intense changes in sea salt geochemistry
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Sérgio Gonçalves, Heitor Evangelista, Johannes Weis, Tristan Harder, Swarup China, Simon Muller, Magdalena Marques, Newton de Magalhães Neto, Heber Passos, Marcelo Sampaio, Jefferson Simões, Bruno Ximenes (+4 others)
2022
Abstract
<jats:title>Abstract</jats:title>
The Antarctic environment has been used as a natural field laboratory to investigate the impacts of enhanced UV-B radiation over the polar terrestrial biota, marine life, and the cryosphere. UV-B increased levels occur due to the stratospheric ozone depletion detected since the early 80s' decade. The real dimension of the ozone depletion threat to the Antarctic environments and the atmospheric chemistry remains uncertain. This work presents new pieces of evidence of this impact on individual aerosol particles sampled in West Antarctica, using a synchrotron-based multi-element microscopic/molecular speciation method. We used the Scanning Transmission X-ray microscopy with Near-Edge X-ray Absorption Fine Structure Spectroscopy combined with Computer-Controlled Scanning Electron Microscopy to identify the molecular changes in sea salt particles due to photolytic processes involving chlorine-enriched particles during the ozone depletion period since the 80´s decade. Combining our data with ice core records, we deduce that the modern effects of UV-B on the tropospheric chlorine geochemistry have no precedent for the Holocene.
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Date 2022-08-01
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