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Title: Reduced connection between the East Asian Summer Monsoon and Southern Hemisphere Circulation on interannual timescales under intense global warming

Abstract

Previous studies show a close relationship between the East Asian Summer Monsoon (EASM) and Southern Hemisphere (SH) circulation on interannual timescales. In this study, we investigate whether this close relationship will change under intensive greenhouse-gas effect by analyzing simulations under two different climate background states: preindustrial era and Representative Concentration Pathway (RCP) 8.5 stabilization from the Community Climate System Model Version 4 (CCSM4). Results show a significantly reduced relationship under stabilized RCP8.5 climate state, such a less correlated EASM with the sea level pressure in the southern Indian Ocean and the SH branch of local Hadley Cell. Further analysis suggests that the collapse of the Atlantic Meridional Overturning Circulation (AMOC) due to this warming leads to a less vigorous northward meridional heat transport, a decreased intertropical temperature contrast in boreal summer, which produces a weaker cross-equatorial Hadley Cell in the monsoonal region and a reduced Interhemispheric Mass Exchange (IME). Since the monsoonal IME acts as a bridge connecting EASM and SH circulation, the reduced IME weakens this connection. By performing freshwater hosing experiment using the Flexible Global Ocean—Atmosphere—Land System model, Grid-point Version 2 (FGOALS-g2), we show a weakened relationship between the EASM and SH circulation as in CCSM4 when AMOCmore » collapses. Our results suggest that a substantially weakened AMOC is the main driver leading to the EASM, which is less affected by SH circulation in the future warmer climate.« less

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [3];  [4]
  1. Nanjing Univ. of Information Science and Technology, Nanjing (China). Collaborative Innovation Center on FOrecast and Evaluation of Meteorlogical Disasters, Key Lab of Meteorlogical Disaster of Ministry of Education, Climate Dynamics Research Center
  2. National Center for Atmospheric Research, Boulder, CO (United States). Climate and Global Dynamics Division
  3. Univ. of Chinese Academy of Sciences, Beijing (China). College of Earth Science; Chinese Academy of Sciences (CAS), Beijing (China). State Key Lab of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Inst. of Atmospheric Physics
  4. Univ. of Chinese Academy of Sciences, Beijing (China). College of Earth Science; Chinese Academy of Sciences (CAS), Beijing (China). State Key Lab of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Inst. of Atmosphe
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States); University Corporation for Atmospheric Research, Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1543488
DOE Contract Number:  
AC02-05CH11231; FC02-97ER62402
Resource Type:
Journal Article
Journal Name:
Climate Dynamics
Additional Journal Information:
Journal Volume: 51; Journal Issue: 9-10; Journal ID: ISSN 0930-7575
Publisher:
Springer-Verlag
Country of Publication:
United States
Language:
English
Subject:
Meteorology & Atmospheric Sciences

Citation Formats

Yu, Tianlei, Guo, Pinwen, Cheng, Jun, Hu, Aixue, Lin, Pengfei, and Yu, Yongqiang. Reduced connection between the East Asian Summer Monsoon and Southern Hemisphere Circulation on interannual timescales under intense global warming. United States: N. p., 2018. Web. doi:10.1007/s00382-018-4121-7.
Yu, Tianlei, Guo, Pinwen, Cheng, Jun, Hu, Aixue, Lin, Pengfei, & Yu, Yongqiang. Reduced connection between the East Asian Summer Monsoon and Southern Hemisphere Circulation on interannual timescales under intense global warming. United States. doi:10.1007/s00382-018-4121-7.
Yu, Tianlei, Guo, Pinwen, Cheng, Jun, Hu, Aixue, Lin, Pengfei, and Yu, Yongqiang. Wed . "Reduced connection between the East Asian Summer Monsoon and Southern Hemisphere Circulation on interannual timescales under intense global warming". United States. doi:10.1007/s00382-018-4121-7.
@article{osti_1543488,
title = {Reduced connection between the East Asian Summer Monsoon and Southern Hemisphere Circulation on interannual timescales under intense global warming},
author = {Yu, Tianlei and Guo, Pinwen and Cheng, Jun and Hu, Aixue and Lin, Pengfei and Yu, Yongqiang},
abstractNote = {Previous studies show a close relationship between the East Asian Summer Monsoon (EASM) and Southern Hemisphere (SH) circulation on interannual timescales. In this study, we investigate whether this close relationship will change under intensive greenhouse-gas effect by analyzing simulations under two different climate background states: preindustrial era and Representative Concentration Pathway (RCP) 8.5 stabilization from the Community Climate System Model Version 4 (CCSM4). Results show a significantly reduced relationship under stabilized RCP8.5 climate state, such a less correlated EASM with the sea level pressure in the southern Indian Ocean and the SH branch of local Hadley Cell. Further analysis suggests that the collapse of the Atlantic Meridional Overturning Circulation (AMOC) due to this warming leads to a less vigorous northward meridional heat transport, a decreased intertropical temperature contrast in boreal summer, which produces a weaker cross-equatorial Hadley Cell in the monsoonal region and a reduced Interhemispheric Mass Exchange (IME). Since the monsoonal IME acts as a bridge connecting EASM and SH circulation, the reduced IME weakens this connection. By performing freshwater hosing experiment using the Flexible Global Ocean—Atmosphere—Land System model, Grid-point Version 2 (FGOALS-g2), we show a weakened relationship between the EASM and SH circulation as in CCSM4 when AMOC collapses. Our results suggest that a substantially weakened AMOC is the main driver leading to the EASM, which is less affected by SH circulation in the future warmer climate.},
doi = {10.1007/s00382-018-4121-7},
journal = {Climate Dynamics},
issn = {0930-7575},
number = 9-10,
volume = 51,
place = {United States},
year = {2018},
month = {3}
}