DOI: 10.1007/s00382-015-2524-2
Scopus记录号: 2-s2.0-84947493857
论文题名: Observed changes of global and western Pacific precipitation associated with global warming SST mode and mega-ENSO SST mode
作者: Kim B.-H. ; Ha K.-J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 45, 期: 2017-11-12 起始页码: 3067
结束页码: 3075
语种: 英语
英文关键词: Anthropogenic forcing
; Moisture flux
; MVEOF
; Natural variability
; Precipitation
; Walker circulation
英文摘要: Changes in the observed precipitation and moisture transport induced by anthropogenic forcing and natural variability were investigated. To separate into the anthropogenic and natural modes, the multi-variate EOF (MVEOF) analysis synthesized from three variables including of precipitation, SST, and moisture flux convergence is used. The precipitation pattern over the tropics has a tri-polar structure in anthropogenic mode but a zonal asymmetric structure near 150°E in natural mode. The patterns of precipitation were determined in the principal modes of moisture flux convergence using MVEOF. Through a moisture budget analysis, the dynamic factor of moisture flux was found to play an important role in the precipitation changes. The natural and anthropogenic modes have zonal wave patterns of potential function associated with the dynamic factor: zonal wavenumber 1 and 2 structure, respectively. When the decadal ENSO is in mega-La Niña phase, natural and anthropogenic forcings represent a positive sign of potential function, which means increased precipitation over the tropical western Pacific (WP). In the tropics, anthropogenic forcing slightly strengthens westerly winds over the Indian Ocean and easterly winds over the WP, while weaken the easterly winds over the eastern Pacific. The natural variability strengthens the Walker circulation in La Niña phase. Therefore, during recent three decades, the slightly strengthening of the wind convergence near the WP by anthropogenic forcing and the strengthening of the Walker circulation by natural variability have caused the increasing precipitation over the WP. © 2015, Springer-Verlag Berlin Heidelberg. 资助项目: NRF, National Research Foundation of Korea
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53922
Appears in Collections: 过去全球变化的重建
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作者单位: Division of Earth Environmental System, Pusan National University, Busan, South Korea
Recommended Citation:
Kim B.-H.,Ha K.-J.. Observed changes of global and western Pacific precipitation associated with global warming SST mode and mega-ENSO SST mode[J]. Climate Dynamics,2015-01-01,45(2017-11-12)