Opposing Shifts of the Hadley Cell Edge and Eddy-Driven Jet Latitude in the Last Glacial Maximum: A Parameter Sweep Study Using a Dynamical Core GCM
A coherent poleward displacement of the Hadley cell (HC) edge and eddy-driven jet latitude has been well documented in the Southern Hemisphere (SH) under the present and future climate changes. However, a recent study showed that during the Last Glacial Maximum (LGM) winter, an equatorward shift of...
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ftseoulnuniv:oai:s-space.snu.ac.kr:10371/205343 2024-09-09T19:27:45+00:00 Opposing Shifts of the Hadley Cell Edge and Eddy-Driven Jet Latitude in the Last Glacial Maximum: A Parameter Sweep Study Using a Dynamical Core GCM Kim, Seo-Yeon Son, Seok-Woo Son, Seok-Woo 2023-03-21 https://hdl.handle.net/10371/205343 https://doi.org/10.1175/JCLI-D-21-0989.1 영어 unknown American Meteorological Society Journal of Climate, Vol.36 No.3, pp.885-898 0894-8755 https://hdl.handle.net/10371/205343 doi:10.1175/JCLI-D-21-0989.1 000920656500010 2-s2.0-85147443187 178785 ATMOSPHERIC CIRCULATION RESPONSE HEMISPHERE WESTERLY WIND VERTICAL STRUCTURE CLIMATE-CHANGE VARIABILITY SENSITIVITY MODELS FLUXES Hadley circulation Jets Dynamics Idealized models Climate change Article ART 2023 ftseoulnuniv https://doi.org/10.1175/JCLI-D-21-0989.1 2024-08-13T23:46:33Z A coherent poleward displacement of the Hadley cell (HC) edge and eddy-driven jet latitude has been well documented in the Southern Hemisphere (SH) under the present and future climate changes. However, a recent study showed that during the Last Glacial Maximum (LGM) winter, an equatorward shift of the HC edge but a poleward shift of the jet latitude are found in the SH. These opposing circulation changes are investigated in this study by conducting the parameter sweep experiments using a dynamical core general circulation model (GCM). By systematically varying the amplitude of tropical upper-tropospheric and polar surface cooling, mimicking the LGM-like climate state, an opposing shift of circulation is reproduced when polar cooling is much stronger than tropical cooling. This is due to the higher sensitivity of the jet-latitude change compared to the HC-edge change in response to polar cooling. Eddy cospectra analysis reveals that the poleward jet shift is dominated by fast waves as the baroclinic zone expands poleward with increasing polar surface cooling. Instead, the HC-edge change is largely attributed to the activity of slow waves and the axisymmetric circulation change. They lead to the HC edge being weakly influenced by extratropical baroclinicity, resulting in an equatorward shift of the HC edge under a global cooling-like condition. Similar circulation changes but with an opposite sign are also found in global warming-like experiments. This result suggests that a poleward HC shift together with an equatorward jet shift can occur even in a future climate if Arctic amplification is accelerated relative to tropical warming. N 1 Article in Journal/Newspaper Arctic Climate change Global warming Seoul National University: S-Space Arctic Journal of Climate 36 3 885 898 |
institution |
Open Polar |
collection |
Seoul National University: S-Space |
op_collection_id |
ftseoulnuniv |
language |
unknown |
topic |
ATMOSPHERIC CIRCULATION RESPONSE HEMISPHERE WESTERLY WIND VERTICAL STRUCTURE CLIMATE-CHANGE VARIABILITY SENSITIVITY MODELS FLUXES Hadley circulation Jets Dynamics Idealized models Climate change |
spellingShingle |
ATMOSPHERIC CIRCULATION RESPONSE HEMISPHERE WESTERLY WIND VERTICAL STRUCTURE CLIMATE-CHANGE VARIABILITY SENSITIVITY MODELS FLUXES Hadley circulation Jets Dynamics Idealized models Climate change Kim, Seo-Yeon Son, Seok-Woo Opposing Shifts of the Hadley Cell Edge and Eddy-Driven Jet Latitude in the Last Glacial Maximum: A Parameter Sweep Study Using a Dynamical Core GCM |
topic_facet |
ATMOSPHERIC CIRCULATION RESPONSE HEMISPHERE WESTERLY WIND VERTICAL STRUCTURE CLIMATE-CHANGE VARIABILITY SENSITIVITY MODELS FLUXES Hadley circulation Jets Dynamics Idealized models Climate change |
description |
A coherent poleward displacement of the Hadley cell (HC) edge and eddy-driven jet latitude has been well documented in the Southern Hemisphere (SH) under the present and future climate changes. However, a recent study showed that during the Last Glacial Maximum (LGM) winter, an equatorward shift of the HC edge but a poleward shift of the jet latitude are found in the SH. These opposing circulation changes are investigated in this study by conducting the parameter sweep experiments using a dynamical core general circulation model (GCM). By systematically varying the amplitude of tropical upper-tropospheric and polar surface cooling, mimicking the LGM-like climate state, an opposing shift of circulation is reproduced when polar cooling is much stronger than tropical cooling. This is due to the higher sensitivity of the jet-latitude change compared to the HC-edge change in response to polar cooling. Eddy cospectra analysis reveals that the poleward jet shift is dominated by fast waves as the baroclinic zone expands poleward with increasing polar surface cooling. Instead, the HC-edge change is largely attributed to the activity of slow waves and the axisymmetric circulation change. They lead to the HC edge being weakly influenced by extratropical baroclinicity, resulting in an equatorward shift of the HC edge under a global cooling-like condition. Similar circulation changes but with an opposite sign are also found in global warming-like experiments. This result suggests that a poleward HC shift together with an equatorward jet shift can occur even in a future climate if Arctic amplification is accelerated relative to tropical warming. N 1 |
author2 |
Son, Seok-Woo |
format |
Article in Journal/Newspaper |
author |
Kim, Seo-Yeon Son, Seok-Woo |
author_facet |
Kim, Seo-Yeon Son, Seok-Woo |
author_sort |
Kim, Seo-Yeon |
title |
Opposing Shifts of the Hadley Cell Edge and Eddy-Driven Jet Latitude in the Last Glacial Maximum: A Parameter Sweep Study Using a Dynamical Core GCM |
title_short |
Opposing Shifts of the Hadley Cell Edge and Eddy-Driven Jet Latitude in the Last Glacial Maximum: A Parameter Sweep Study Using a Dynamical Core GCM |
title_full |
Opposing Shifts of the Hadley Cell Edge and Eddy-Driven Jet Latitude in the Last Glacial Maximum: A Parameter Sweep Study Using a Dynamical Core GCM |
title_fullStr |
Opposing Shifts of the Hadley Cell Edge and Eddy-Driven Jet Latitude in the Last Glacial Maximum: A Parameter Sweep Study Using a Dynamical Core GCM |
title_full_unstemmed |
Opposing Shifts of the Hadley Cell Edge and Eddy-Driven Jet Latitude in the Last Glacial Maximum: A Parameter Sweep Study Using a Dynamical Core GCM |
title_sort |
opposing shifts of the hadley cell edge and eddy-driven jet latitude in the last glacial maximum: a parameter sweep study using a dynamical core gcm |
publisher |
American Meteorological Society |
publishDate |
2023 |
url |
https://hdl.handle.net/10371/205343 https://doi.org/10.1175/JCLI-D-21-0989.1 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Global warming |
genre_facet |
Arctic Climate change Global warming |
op_relation |
Journal of Climate, Vol.36 No.3, pp.885-898 0894-8755 https://hdl.handle.net/10371/205343 doi:10.1175/JCLI-D-21-0989.1 000920656500010 2-s2.0-85147443187 178785 |
op_doi |
https://doi.org/10.1175/JCLI-D-21-0989.1 |
container_title |
Journal of Climate |
container_volume |
36 |
container_issue |
3 |
container_start_page |
885 |
op_container_end_page |
898 |
_version_ |
1809897127509229568 |