Characteristics of Future Warmer Base States in CESM2
Abstract Simulations of 21st century climate with Community Earth System Model version 2 (CESM2) using the standard atmosphere (CAM6), denoted CESM2(CAM6), and the latest generation of the Whole Atmosphere Community Climate Model (WACCM6), denoted CESM2(WACCM6), are presented, and a survey of genera...
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ftdoajarticles:oai:doaj.org/article:83a3d38fa1e141feb8100b1e4b15e434 2023-05-15T15:12:14+02:00 Characteristics of Future Warmer Base States in CESM2 Gerald A. Meehl Julie M. Arblaster Susan Bates Jadwiga H. Richter Claudia Tebaldi Andrew Gettelman Brian Medeiros Julio Bacmeister Patricia DeRepentigny Nan Rosenbloom Christine Shields Aixue Hu Haiyan Teng Michael J. Mills Gary Strand 2020-09-01T00:00:00Z https://doi.org/10.1029/2020EA001296 https://doaj.org/article/83a3d38fa1e141feb8100b1e4b15e434 EN eng American Geophysical Union (AGU) https://doi.org/10.1029/2020EA001296 https://doaj.org/toc/2333-5084 2333-5084 doi:10.1029/2020EA001296 https://doaj.org/article/83a3d38fa1e141feb8100b1e4b15e434 Earth and Space Science, Vol 7, Iss 9, Pp n/a-n/a (2020) Community Earth System Model (CESM) Global Coupled Earth System modeling future climate projections emission scenarios Astronomy QB1-991 Geology QE1-996.5 article 2020 ftdoajarticles https://doi.org/10.1029/2020EA001296 2022-12-31T07:19:06Z Abstract Simulations of 21st century climate with Community Earth System Model version 2 (CESM2) using the standard atmosphere (CAM6), denoted CESM2(CAM6), and the latest generation of the Whole Atmosphere Community Climate Model (WACCM6), denoted CESM2(WACCM6), are presented, and a survey of general results is described. The equilibrium climate sensitivity (ECS) of CESM2(CAM6) is 5.3°C, and CESM2(WACCM6) is 4.8°C, while the transient climate response (TCR) is 2.1°C in CESM2(CAM6) and 2.0°C in CESM2(WACCM6). Thus, these two CESM2 model versions have higher values of ECS than the previous generation of model, the CESM (CAM5) (hereafter CESM1), that had an ECS of 4.1°C, though the CESM2 versions have lower values of TCR compared to the CESM1 with a somewhat higher value of 2.3°C. All model versions produce credible simulations of the time evolution of historical global surface temperature. The higher ECS values for the CESM2 versions are reflected in higher values of global surface temperature increase by 2,100 in CESM2(CAM6) and CESM2(WACCM6) compared to CESM1 between comparable emission scenarios for the high forcing scenario. Future warming among CESM2 model versions and scenarios diverges around 2050. The larger values of TCR and ECS in CESM2(CAM6) compared to CESM1 are manifested by greater warming in the tropics. Associated with a higher climate sensitivity, for CESM2(CAM6) the first instance of an ice‐free Arctic in September occurs for all scenarios and ensemble members in the 2030–2050 time frame, but about a decade later in CESM2(WACCM6), occurring around 2040–2060. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Earth and Space Science 7 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Community Earth System Model (CESM) Global Coupled Earth System modeling future climate projections emission scenarios Astronomy QB1-991 Geology QE1-996.5 |
spellingShingle |
Community Earth System Model (CESM) Global Coupled Earth System modeling future climate projections emission scenarios Astronomy QB1-991 Geology QE1-996.5 Gerald A. Meehl Julie M. Arblaster Susan Bates Jadwiga H. Richter Claudia Tebaldi Andrew Gettelman Brian Medeiros Julio Bacmeister Patricia DeRepentigny Nan Rosenbloom Christine Shields Aixue Hu Haiyan Teng Michael J. Mills Gary Strand Characteristics of Future Warmer Base States in CESM2 |
topic_facet |
Community Earth System Model (CESM) Global Coupled Earth System modeling future climate projections emission scenarios Astronomy QB1-991 Geology QE1-996.5 |
description |
Abstract Simulations of 21st century climate with Community Earth System Model version 2 (CESM2) using the standard atmosphere (CAM6), denoted CESM2(CAM6), and the latest generation of the Whole Atmosphere Community Climate Model (WACCM6), denoted CESM2(WACCM6), are presented, and a survey of general results is described. The equilibrium climate sensitivity (ECS) of CESM2(CAM6) is 5.3°C, and CESM2(WACCM6) is 4.8°C, while the transient climate response (TCR) is 2.1°C in CESM2(CAM6) and 2.0°C in CESM2(WACCM6). Thus, these two CESM2 model versions have higher values of ECS than the previous generation of model, the CESM (CAM5) (hereafter CESM1), that had an ECS of 4.1°C, though the CESM2 versions have lower values of TCR compared to the CESM1 with a somewhat higher value of 2.3°C. All model versions produce credible simulations of the time evolution of historical global surface temperature. The higher ECS values for the CESM2 versions are reflected in higher values of global surface temperature increase by 2,100 in CESM2(CAM6) and CESM2(WACCM6) compared to CESM1 between comparable emission scenarios for the high forcing scenario. Future warming among CESM2 model versions and scenarios diverges around 2050. The larger values of TCR and ECS in CESM2(CAM6) compared to CESM1 are manifested by greater warming in the tropics. Associated with a higher climate sensitivity, for CESM2(CAM6) the first instance of an ice‐free Arctic in September occurs for all scenarios and ensemble members in the 2030–2050 time frame, but about a decade later in CESM2(WACCM6), occurring around 2040–2060. |
format |
Article in Journal/Newspaper |
author |
Gerald A. Meehl Julie M. Arblaster Susan Bates Jadwiga H. Richter Claudia Tebaldi Andrew Gettelman Brian Medeiros Julio Bacmeister Patricia DeRepentigny Nan Rosenbloom Christine Shields Aixue Hu Haiyan Teng Michael J. Mills Gary Strand |
author_facet |
Gerald A. Meehl Julie M. Arblaster Susan Bates Jadwiga H. Richter Claudia Tebaldi Andrew Gettelman Brian Medeiros Julio Bacmeister Patricia DeRepentigny Nan Rosenbloom Christine Shields Aixue Hu Haiyan Teng Michael J. Mills Gary Strand |
author_sort |
Gerald A. Meehl |
title |
Characteristics of Future Warmer Base States in CESM2 |
title_short |
Characteristics of Future Warmer Base States in CESM2 |
title_full |
Characteristics of Future Warmer Base States in CESM2 |
title_fullStr |
Characteristics of Future Warmer Base States in CESM2 |
title_full_unstemmed |
Characteristics of Future Warmer Base States in CESM2 |
title_sort |
characteristics of future warmer base states in cesm2 |
publisher |
American Geophysical Union (AGU) |
publishDate |
2020 |
url |
https://doi.org/10.1029/2020EA001296 https://doaj.org/article/83a3d38fa1e141feb8100b1e4b15e434 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Earth and Space Science, Vol 7, Iss 9, Pp n/a-n/a (2020) |
op_relation |
https://doi.org/10.1029/2020EA001296 https://doaj.org/toc/2333-5084 2333-5084 doi:10.1029/2020EA001296 https://doaj.org/article/83a3d38fa1e141feb8100b1e4b15e434 |
op_doi |
https://doi.org/10.1029/2020EA001296 |
container_title |
Earth and Space Science |
container_volume |
7 |
container_issue |
9 |
_version_ |
1766342947849109504 |