West Antarctic Surface Climate Changes Since the Mid‐20th Century Driven by Anthropogenic Forcing

Although the West Antarctic surface climate has experienced large changes over past decades with widespread warming, an overall increase in snow accumulation and a deepening of Amundsen Sea Low, exact role human activities these not yet been fully investigated, which limits confidence future projections. Here, we perform detection attribution analysis using instrumental proxy-based reconstructions, two model simulation ensembles to quantify forced response observed changes. We show that since 1950s were driven by anthropogenic forcing, particular greenhouse gas forcing stratospheric ozone depletion. Therefore, our results indicate 21st century will depend on both emissions layer recovery.