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. The Antarctic surface mass balance (SMB) has global climatic impactsthrough its effects on global sea-level rise. The forced increasein Antarctic SMB over the second half of the 20th century was arguedto stem from multiple forcing agents, including ozone and ozone-depletingsubstances (ODSs). Here we use ensembles of fixed-forcing model simulationsto quantify and contrast the contributions of stratospheric ozone,tropospheric ozone and ODSs to increasesin the Antarctic SMB. We show that ODSs and stratospheric ozone makecomparable contributions and together account for 44 % of the increasein the annual mean Antarctic SMB over the second half of the 20thcentury. In contrast, tropospheric ozone has an insignificant impacton the SMB increase. A large portion of the annual mean SMB increaseoccurs during austral summer, when stratospheric ozone is found toaccount for 63 % of the increase. Furthermore, we demonstrate thatstratospheric ozone increases the SMB by enhancing the meridionalmean and eddy flows towards the continent, thus converging more watervapor over the Antarctic.

Distinguishing the impacts of ozone and ozone-depleting substances on the recent increase in Antarctic surface mass balance