globalchange  > 气候变化事实与影响
DOI: 10.1175/JCLI-D-15-0272.1
Scopus记录号: 2-s2.0-84957658192
论文题名:
A new upper-level circulation index for the East Asian summer monsoon variability
作者: Zhao G.; Huang G.; Wu R.; Tao W.; Gong H.; Qu X.; Hu K.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期:24
起始页码: 9977
结束页码: 9996
语种: 英语
Scopus关键词: Advection ; Atmospheric pressure ; Atmospheric temperature ; Oceanography ; Surface waters ; Tropics ; Air temperature variations ; Circulation systems ; East Asian summer monsoon ; Inter-decadal variability ; Operational predictions ; Sea surface temperature anomalies ; Southern oscillation ; Tropical Indian ocean ; Atmospheric thermodynamics ; air temperature ; atmospheric circulation ; monsoon ; precipitation (climatology) ; summer ; teleconnection ; troposphere ; zonal wind ; Far East ; Indian Ocean ; Indian Ocean (Tropical) ; Pacific Ocean ; South China Sea ; Citrus maxima
英文摘要: The East Asian summer monsoon (EASM) and its variability involve circulation systems in both the tropics and midlatitudes as well as in both the lower and upper troposphere. Considering this fact, a new EASM index (NEWI) is proposed based on 200-hPa zonal wind, which takes into account wind anomalies in the southern (about 5°N), middle (about 20°N), and northern areas (about 35°N) of East Asia. The NEWI can capture the interannual EASM-related climate anomalies and the interdecadal variability well. Compared to previous indices, the NEWI shows a better performance in describing precipitation and air temperature variations over East Asia. It can also show distinct climate anomalous features in early and late summer. The NEWI is tightly associated with the East Asian-Pacific or the Pacific-Japan teleconnection, suggesting a possible role of internal dynamics in the EASM variability. Meanwhile, the NEWI is significantly linked to El Niño-Southern Oscillation and tropical Indian Ocean sea surface temperature anomalies. Furthermore, the NEWI is highly predictable in the ENSEMBLES models, indicating its advantage for operational prediction of the EASM. The physical mechanism of the EASM variability as represented by the NEWI is also explicit. Both warm advection anomalies of temperature by anomalous westerly winds and the advection of anomalous positive relative vorticity by northerly basic winds cause anomalous ascending motion over the mei-yu-changma-baiu rainfall area, and vice versa over the South China Sea area. Hence, this NEWI would be a good choice to study, monitor, and predict the EASM. © 2015 American Meteorological Society.
资助项目: NSFC, National Natural Science Foundation of China ; NSFC, National Natural Science Foundation of China ; NSFC, National Natural Science Foundation of China ; NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50667
Appears in Collections:气候变化事实与影响

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作者单位: State Key Lab. of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, College of Earth Science, University of Chinese Academy of Sciences, Beijing, China; State Key Lab. of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Joint Center for Global Change Studies, Beijing, China; Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

Recommended Citation:
Zhao G.,Huang G.,Wu R.,et al. A new upper-level circulation index for the East Asian summer monsoon variability[J]. Journal of Climate,2015-01-01,28(24)
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