Antarctic ice‐sheet meltwater reduces transient warming and climate sensitivity through the sea‐surface temperature pattern effect
Coupled global climate models (GCMs) generally fail to reproduce the observed sea-surface temperature (SST) trend pattern since the 1980s. The model-observation discrepancies may arise in part from the lack of realistic Antarctic ice-sheet meltwater input in GCMs. Here we employ two sets of CESM1-CA...
Published in: | Geophysical Research Letters |
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Online Access: | https://doi.org/10.1029/2022GL101249 |
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ftncar:oai:drupal-site.org:articles_25948 2023-05-15T13:46:01+02:00 Antarctic ice‐sheet meltwater reduces transient warming and climate sensitivity through the sea‐surface temperature pattern effect Dong, Yue (author) Pauling, Andrew G. (author) Sadai, Shaina (author) Armour, Kyle C. (author) 2022-12-28 https://doi.org/10.1029/2022GL101249 en eng Geophysical Research Letters--Geophysical Research Letters--0094-8276--1944-8007 Data for "Antarctic ice-sheet meltwater reduces transient warming and climate sensitivity through the sea-surface temperature pattern effect"--10.5281/zenodo.7072848 articles:25948 doi:10.1029/2022GL101249 ark:/85065/d70c50nb Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. CC-BY-NC article Text 2022 ftncar https://doi.org/10.1029/2022GL101249 2023-01-23T18:53:18Z Coupled global climate models (GCMs) generally fail to reproduce the observed sea-surface temperature (SST) trend pattern since the 1980s. The model-observation discrepancies may arise in part from the lack of realistic Antarctic ice-sheet meltwater input in GCMs. Here we employ two sets of CESM1-CAM5 simulations forced by anomalous Antarctic meltwater fluxes over 1980–2013 and through the 21st century. Both show a reduced global warming rate and an SST trend pattern that better resembles observations. The meltwater drives surface cooling in the Southern Ocean and the tropical southeast Pacific, in turn increasing low-cloud cover and driving radiative feedbacks to become more stabilizing (corresponding to a lower effective climate sensitivity). These feedback changes can contribute as substantially as ocean heat uptake efficiency changes in reducing the global warming rate. Accurately projecting historical and future warming thus requires improved representation of Antarctic meltwater and its impacts. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Southern Ocean OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) Antarctic Pacific Southern Ocean Geophysical Research Letters 49 24 |
institution |
Open Polar |
collection |
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research) |
op_collection_id |
ftncar |
language |
English |
description |
Coupled global climate models (GCMs) generally fail to reproduce the observed sea-surface temperature (SST) trend pattern since the 1980s. The model-observation discrepancies may arise in part from the lack of realistic Antarctic ice-sheet meltwater input in GCMs. Here we employ two sets of CESM1-CAM5 simulations forced by anomalous Antarctic meltwater fluxes over 1980–2013 and through the 21st century. Both show a reduced global warming rate and an SST trend pattern that better resembles observations. The meltwater drives surface cooling in the Southern Ocean and the tropical southeast Pacific, in turn increasing low-cloud cover and driving radiative feedbacks to become more stabilizing (corresponding to a lower effective climate sensitivity). These feedback changes can contribute as substantially as ocean heat uptake efficiency changes in reducing the global warming rate. Accurately projecting historical and future warming thus requires improved representation of Antarctic meltwater and its impacts. |
author2 |
Dong, Yue (author) Pauling, Andrew G. (author) Sadai, Shaina (author) Armour, Kyle C. (author) |
format |
Article in Journal/Newspaper |
title |
Antarctic ice‐sheet meltwater reduces transient warming and climate sensitivity through the sea‐surface temperature pattern effect |
spellingShingle |
Antarctic ice‐sheet meltwater reduces transient warming and climate sensitivity through the sea‐surface temperature pattern effect |
title_short |
Antarctic ice‐sheet meltwater reduces transient warming and climate sensitivity through the sea‐surface temperature pattern effect |
title_full |
Antarctic ice‐sheet meltwater reduces transient warming and climate sensitivity through the sea‐surface temperature pattern effect |
title_fullStr |
Antarctic ice‐sheet meltwater reduces transient warming and climate sensitivity through the sea‐surface temperature pattern effect |
title_full_unstemmed |
Antarctic ice‐sheet meltwater reduces transient warming and climate sensitivity through the sea‐surface temperature pattern effect |
title_sort |
antarctic ice‐sheet meltwater reduces transient warming and climate sensitivity through the sea‐surface temperature pattern effect |
publishDate |
2022 |
url |
https://doi.org/10.1029/2022GL101249 |
geographic |
Antarctic Pacific Southern Ocean |
geographic_facet |
Antarctic Pacific Southern Ocean |
genre |
Antarc* Antarctic Ice Sheet Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Southern Ocean |
op_relation |
Geophysical Research Letters--Geophysical Research Letters--0094-8276--1944-8007 Data for "Antarctic ice-sheet meltwater reduces transient warming and climate sensitivity through the sea-surface temperature pattern effect"--10.5281/zenodo.7072848 articles:25948 doi:10.1029/2022GL101249 ark:/85065/d70c50nb |
op_rights |
Copyright author(s). This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.1029/2022GL101249 |
container_title |
Geophysical Research Letters |
container_volume |
49 |
container_issue |
24 |
_version_ |
1766235057339498496 |