Current and projected changes in the southern hemisphere UTLS ozone and effects of bushfire smoke aerosols ...

• Main Author: Siddaway, Jason Michael
• Format: Text
• Language: unknown
• Published: La Trobe 2023
• Subjects: Antarc*; Antarctic; Antarctica
• Online Access: https://dx.doi.org/10.26181/21852624.v1; https://opal.latrobe.edu.au/articles/thesis/Current_and_projected_changes_in_the_southern_hemisphere_UTLS_ozone_and_effects_of_bushfire_smoke_aerosols/21852624/1

Submission note: A thesis submitted in total fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Molecular Science, College of Science, Health and Engineering, La Trobe University, Bundoora. An analysis of future projections of ozone levels over Antarctica from coupled chemistry climate models (CCMVal-2) using multi-model median (MMM) trends found that the Antarctic Total Ozone Column (TOC) will not return to 1965 values during the September-November months by the end of the 21st century and that December TOC will not return to that baseline until 2080. The rate of TOC recovery during December was slower than for austral spring, due to a delayed increase of ozone at 50-100 hPa. At these altitudes, MMM temperature trends were projected to stop increasing by 2060 due to the combined radiative effect of a projected increase in greenhouse gases (GHG) and a decrease in ozone depleting substances. A persisting polar vortex was projected until the middle of the 21st century during ...