eCite Digital Repository

Interannual SAM modulation of Antarctic sea ice extent does not account for its long-term trends, pointing to a limited role for ozone depletion

Citation

Polvani, LM and Banerjee, A and Chemkee, R and Doddridge, E and Ferreira, D and Gnanadesikan, A and Holland, MA and Kostov, Y and Marshall, J and Seviour, WJM and Solomon, S and Waugh, DW, Interannual SAM modulation of Antarctic sea ice extent does not account for its long-term trends, pointing to a limited role for ozone depletion, Geophysical Research Letters, 48, (21) Article e2021GL094871. ISSN 0094-8276 (2021) [Refereed Article]


Preview
PDF
Pending copyright assessment - Request a copy
1Mb
  

DOI: doi:10.1029/2021GL094871

Abstract

The expansion of Antarctic sea ice since 1979 in the presence of increasing greenhouse gases remains one of the most puzzling features of current climate change. Some studies have proposed that the formation of the ozone hole, via the Southern Annular Mode, might explain that expansion, and a recent paper highlighted a robust causal link between summertime Southern Annular Mode (SAM) anomalies and sea ice anomalies in the subsequent autumn. Here we show that many models are able to capture this relationship between the SAM and sea ice, but also emphasize that the SAM only explains a small fraction of the year-to-year variability. Finally, examining multidecadal trends, in models and in observations, we confirm the findings of several previous studies and conclude that the SAMľand thus the ozone holeľare not the primary drivers of the sea ice expansion around Antarctica in recent decades.

Item Details

Item Type:Refereed Article
Keywords:ice, ozone, Southern Ocean
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Climate change models
UTAS Author:Doddridge, E (Dr Edward Doddridge)
ID Code:147619
Year Published:2021
Deposited By:Oceans and Cryosphere
Deposited On:2021-11-10
Last Modified:2021-11-10
Downloads:0

Repository Staff Only: item control page