Projected changes in Antarctic daily temperature in CMIP6 under different warming scenarios during two future periods
Jiangping Zhu
A B , Aihong Xie A * , Xiang Qin A * , Bing Xu A B and Yicheng Wang C
+ Author Affiliations
- Author Affiliations
A State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu, 730000, PR China.
B University of Chinese Academy of Sciences, Beijing, 100049, PR China.
C Lanzhou Central Meteorological Observatory, Lanzhou, Gansu, 730000, PR China.
* Correspondence to: xieaihong@nieer.ac.cn, qinxiang@lzb.ac.cn
Journal of Southern Hemisphere Earth Systems Science 72(3) 165-178 https://doi.org/10.1071/ES22008
Submitted: 22 March 2022 Accepted: 7 September 2022 Published: 11 October 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing on behalf of BoM. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)
Abstract
Global warming increases the frequency and intensity of climate extremes, but the changes in climate extremes over the Antarctic Ice Sheet (AIS) during different periods are unknown. Changes in surface temperature extreme indices (TN10p, TX10p, TN90p, TX90p, CSDI, WSDI, TNn, TNx, TXn, TXx and DTR) are assessed during 2021–2050 and 2071–2100 under SSP1-2.6, SSP2-4.5, SSP3-7.0 and SSP5-8.5, based on the multi-model ensemble mean (MMEM) from the Coupled Model Intercomparison Project Phase 6 (CMIP6). The extreme indices, excluding TXn and DTR, illustrate the opposite trend in the two periods in SSP1-2.6 over the AIS. Generally, the changes in extreme indices reflect the continued warming over AIS in the future, and the warming is projected to intensify in SSP3-7.0 and SSP5-8.5. The variations in the extreme indices exhibit regional differences. The Antarctic Peninsula displays rapid changes in TNn, TXn and DTR. In SSP5-8.5, the magnitudes of all climate index tendencies are greater during 2071–2100 than 2021–2050. The variations in TX10p, TX90p, TN10p, TN90p, WSDI and CSDI are faster in the Antarctic inland than in the other regions over the AIS. However, the decrease in the DTR is concentrated along the AIS coast and extends to the interior region, whereas the increasing trend occurs in the Antarctic inland. In West AIS, TX90p and TN90p rapidly increase during 2021–2050, whereas the rapid changing signals disappear in this region in 2071–2100. The dramatic changes in TNn, TXn and DTR occur at the Ross Ice Shelf during 2071–2100, indicating an increased risk of collapse. For TNx and TXx, the degree of warming in the later part of the 21st century is divided by the transantarctic mountains, and greater changes appear on the eastern side. Generally, Antarctic amplification of TNn, TXn and DTR is observed except under SSP1-2.6. In addition, TNx and TXx amplifications occur in SSP3-7.0 and SSP5-8.5.
Keywords: Antarctica, climate, CMIP6, ETCCDI, extreme indices, extreme temperature, model evaluation, scenarios.
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