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Historical fidelity and future change of Amundsen Sea Low under 1.5 °C-4 °C global warming in CMIP6

Cited 7 time in wos
Cited 8 time in scopus
Title
Historical fidelity and future change of Amundsen Sea Low under 1.5 °C-4 °C global warming in CMIP6
Other Titles
전지구 평균기온 1.5-4도 증가시 남극 아문젠해 저기압의 미래 변화
Authors
Gao, Miaoni
Kim, Seong-Joong
Yang, Jing
Liu, Jiping
Jiang, Tong
Su, Buda
Wang, Yanjun
Huang, Jinlong
Subject
Meteorology & Atmospheric Sciences
Keywords
Amundsen Sea LowCMIP6Historical FidelityFuture ProjectionGlobal Warming Levels
Issue Date
2021-06-15
Citation
Gao, Miaoni, et al. 2021. "Historical fidelity and future change of Amundsen Sea Low under 1.5 °C-4 °C global warming in CMIP6". ATMOSPHERIC RESEARCH, 255: 1-12.
Abstract
The realistic simulation and projection of the Amundsen Sea Low (ASL) are essential for understanding the Antarctic climate and global climate change. Using 14 models that participated in phase 6 of the Coupled Model Intercomparison Project (CMIP6), this study evaluates the climatological characteristics of ASL with comparison to the ERA5 reanalysis and their CMIP5 versions and assesses the future change of ASL under 1.5 °C-4 °C global warming. The climatological spatial distribution of ASL is captured reasonably but with underestimated intensity by CMIP6 multi-model ensemble (MME). Among the CMIP6 models, EC-Earth3 has most accurate representation of ASL according to the pattern correlation and biases. The seasonal variation of the ASL depth and location are found to be reasonably reproduced by the CMIP6 models. CMIP6 MME has higher skills in simulating the seasonal cycle of absolute depth and zonal migration of the ASL center. The relative central pressure of ASL is underestimated in all seasons and there is a 4-degree northward shift bias of the ASL center in austral winter, which were also evident in the CMIP5. The semiannual cycle of ASL absolute depth with two deepest pressure in April and October is also captured by CMIP6 MME. However, the observed peak of pressure between the two months occurs in June, while it delays one month and appears until July in CMIP6 MME. Compared with CMIP5, CMIP6 MME exhibit evident reduced uncertainties and overall improvement in simulating absolute depth and location of the ASL center, which might be attributed to models’ capability of representing the location of Southern Hemisphere westerlies, while the biases in relative depth become even large in CMIP6 MME. In response to future warming from 1.5 °C to 4 °C above pre-industrial levels, the absolute depth of ASL will very likely deepen with larger amplitude in all seasons, while the relative depth might enhance only under high-level warmer world in austral autumn to winter. The CMIP6 MME also projects that the ASL will shift poleward constantly in austral summer and migrate southwestward during austral autumn with the rising global mean temperature. Among all the seasons, the most prominent future changes in intensity and location of ASL are found in autumn. The enhancement and poleward movement of ASL could also be identified during the Ross Sea ice advance season under 1.5 °C-4 °C global warming. The results reveal the potential of CMIP6 models in the ASL study and the impact of ASL on Antarctic climate under different global warming levels.
URI
https://repository.kopri.re.kr/handle/201206/12972
DOI
http://dx.doi.org/10.1016/j.atmosres.2021.105533
Type
Article
Station
King Sejong Station
Indexed
SCIE
Appears in Collections  
2021-2021, Understanding of Antarctic climate and environment and assessments of global influence (21-21) / Kim, Seong-Joong (PE21030)
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