globalchange  > 气候变化与战略
DOI: 10.1175/JCLI-D-18-0218.1
Scopus ID: 2-s2.0-85061819387
Title:
Contributions of different combinations of the IPO and AMO to recent changes in winter East Asian jets
Author: Huang D.; Dai A.; Yang B.; Yan P.; Zhu J.; Zhang Y.
Source Publication: Journal of Climate
ISSN: 8948755
Publishing Year: 2019
Volume: 32, Issue:5
pages begin: 1607
pages end: 1626
Language: 英语
Keyword: Dynamics ; Jets ; North Atlantic Oscillation ; Numerical analysis/modeling ; Pacific decadal oscillation
Scopus Keyword: Atmospheric pressure ; Dynamics ; Jets ; Molecular physics ; Potential energy ; Atlantic multidecadal oscillations ; Atmospheric model simulations ; Inter-decadal pacific oscillations ; Meridional temperature gradient ; North Atlantic oscillations ; Numerical analysis/modeling ; Pacific decadal oscillation ; Severe weather events ; Growth rate
English Abstract: 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. 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. © 2019, American Meteorological Society.
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被引频次[WOS]:4   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Identifier: http://119.78.100.158/handle/2HF3EXSE/117188
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Recommended Citation:
Huang D.,Dai A.,Yang B.,et al. Contributions of different combinations of the IPO and AMO to recent changes in winter East Asian jets[J]. Journal of Climate,2019-01-01,32(5)
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