第一届未来大气科学论坛

The winter temperature variability of Antarctic Peninsula (AP) has been proven to be influenced by sea surface temperature (SST) anomalies over the Tasman Sea. Using outputs over an extended time period from the historical experiments, the simulation skills of the atmospheric responses to Tasman Sea SST for CMIP6 models are evaluated in this study, with an emphasis on the relationships with AP temperatures. The spatial correlation coefficient and normalized standard deviation are used as the evaluation metrics. Corresponding results suggest that the majority of CMIP6 models could capture the basic spatial distributions of Tasman Sea-related teleconnections across the Southern Hemisphere extratropical region, featuring a Pacific–South America (PSA)-like pattern. However, the overestimation of atmospheric interannual variability and the underestimation of oceanic interannual variability in CMIP6 models result in a considerable amplification of the atmospheric responses to SST anomalies. The model uncertainty in depicting the relationships between Tasman Sea SSTs and AP surface temperatures, as well as the associated teleconnections, could partially be attributed to variations in grid resolutions among models. Additionally, further analysis of the Antarctic sea ice shows that Tasman Sea SST may contribute to the interannual variability of the Antarctic dipole in CMIP6.

Historical experiment,CMIP6,model evaluation,Antarctic Peninsula,Teleconnection