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Title: Contributions of Different Combinations of the IPO and AMO to Recent Changes in Winter East Asian Jets

Journal Article · · Journal of Climate
 [1];  [2];  [1];  [1];  [3];  [1]
  1. Nanjing Univ. (China)
  2. State Univ. of New York (SUNY), Albany, NY (United States)
  3. Hohai Univ., Nanjing (China)
+ Show Author Affiliations

Recent concurrent shifts of the East Asian polar-front jet (EAPJ) and the East Asian subtropical jet (EASJ) in the boreal winter have raised concerns, since they could result in severe weather events over East Asia. However, the possible mechanisms are not fully understood. In this study, the roles of the interdecadal Pacific oscillation (IPO) and the Atlantic multidecadal oscillation (AMO) are investigated by analyzing reanalysis data and model simulations. Results show that combinations of opposite phases of the IPO and AMO can result in significant shifts of the two jets during 1920–2014. This relationship is particularly evident during 1999–2014 and 1979–98 in the reanalysis data. A combination of a negative phase of the IPO (-IPO) and a positive phase of the AMO (+AMO) since the late 1990s has enhanced the meridional temperature gradient and the Eady growth rate and thus westerlies over the region between the two jets, but weakened them to the south and north of the region, thereby contributing to the equatorward and poleward shifts of the EAPJ and EASJ, respectively. Atmospheric model simulations are further used to investigate the relative contribution of -IPO and +AMO to the jet shifts. The model simulations show that the combination of -IPO and +AMO favors the recent jet changes more than the individual -IPO or +AMO. Finally, under a concurrent -IPO and +AMO, the meridional eddy transport of zonal momentum and sensitive heat strengthens, and more mean available potential energy converts to the eddy available potential energy over the region between the two jets, which enhances westerly winds there.

Research Organization:
State Univ. of New York (SUNY), Albany, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Jiangsu Collaborative Innovation Center for Climate Change; National Science Foundation (NSF); National Oceanic and Atmospheric Administration (NOAA)
Grant/Contract Number:
SC0012602; 2016YFA0600701; 41575071; 41775073; AGS-1353740; OISE-1743738; NA15OAR4310086
OSTI ID:
1611901
Journal Information:
Journal of Climate, Vol. 32, Issue 5; ISSN 0894-8755
Publisher:
American Meteorological SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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The 10–30‐day oscillation of winter rainfall in southern China and its relationship with circulation patterns in different latitudes journal November 2019

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Related Subjects

54 ENVIRONMENTAL SCIENCES
meteorology & atmospheric sciences
dynamics
jets
North Atlantic oscillation
pacific decadal oscillation
numerical analysis/modeling