Widening of the Hadley cell from Last Glacial Maximum (LGM) to future climate
SCIE
SCOPUS
- Title
- Widening of the Hadley cell from Last Glacial Maximum (LGM) to future climate
- Authors
- SON, SEOK WOO; KIM, SEO YEON; MIN, SEUNG KI
- Date Issued
- 2018-01
- Publisher
- American Meteorological Society
- Abstract
- The Hadley Cell (HC) change from paleoclimate to future climate is examined by comparing coupled model simulations archived for the Paleoclimate Modelling Intercomparison Project phase 3 (PMIP3) and the Coupled Model Intercomparison Project phase 5 (CMIP5). Specifically, HC width and strength are evaluated using 100-year equilibrium simulations for the Last Glacial Maximum (LGM), Pre-Industrial (PI), and Extended Concentration Pathway 4.5 (ECP4.5) conditions. Where available, ECP8.5 simulations are also examined to increase the sample size. All models show a systematic widening of the HC from the LGM to the PI, and to the ECP4.5/8.5 simulations. Such widening, which is found in both hemispheres with more robust change in the Southern Hemisphere (SH) than in the Northern Hemisphere (NH), is significantly correlated with global-mean surface air temperature change and the associated static stability change in the subtropics. Based on the zero-crossing latitude of 500-hPa mass streamfunction, about 4.5° latitude widening of the HC results from global warming of 10 °C. HC strength also exhibits a systematic weakening in the NH. However, in the SH, HC strength shows a rather minor change from LGM to ECP4.5 conditions, because of the cancellation between HC weakening during the austral summer/fall and its strengthening during the spring. This result, which suggests no systematic relationship between HC width and strength changes, is discussed in the context of quasi-geostrophic zonal-mean dynamics. Overall findings are also compared with recent studies that are based on transient climate model simulations.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/38990
- DOI
- 10.1175/JCLI-D-17-0328.1
- ISSN
- 0894-8755
- Article Type
- Article
- Citation
- JOURNAL OF CLIMATE, vol. 31, no. 1, page. 267 - 281, 2018-01
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