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

Journal Article · · Climate Dynamics
 [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
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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.

Research Organization:
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 Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
DOE Contract Number:
AC02-05CH11231; FC02-97ER62402
OSTI ID:
1543488
Journal Information:
Climate Dynamics, Vol. 51, Issue 9-10; ISSN 0930-7575
Publisher:
Springer-Verlag
Country of Publication:
United States
Language:
English

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