DOI: 10.1007/s00382-012-1484-z
Scopus记录号: 2-s2.0-84875694872
论文题名: Observational evidences of Walker circulation change over the last 30 years contrasting with GCM results
作者: Sohn B.J. ; Yeh S.-W. ; Schmetz J. ; Song H.-J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 40, 期: 2017-07-08 起始页码: 1721
结束页码: 1732
语种: 英语
英文关键词: Climate change over the tropics
; Decadal variation
; El Nino
; Walker circulation
英文摘要: In order to examine the changes in Walker circulation over the recent decades, we analyzed the sea surface temperature (SST), deep convective activities, upper tropospheric moistening, sea level pressure (SLP), and effective wind in the boundary layer over the 30-year period of 1979-2008. The analysis showed that the eastern tropical Pacific has undergone cooling while the western Pacific has undergone warming over the past three decades, causing an increase in the east-west SST gradient. It is indicated that the tropical atmosphere should have responded to these SST changes; increased deep convective activities and associated upper tropospheric moistening over the western Pacific ascending region, increased SLP over the eastern Pacific descending region in contrast to decreased SLP over the western Pacific ascending region, and enhanced easterly wind in the boundary layer in response to the SLP change. These variations, recognized from different data sets, occur in tandem with each other, strongly supporting the intensified Walker circulation over the tropical Pacific Ocean. Since the SST trend was attributed to more frequent occurrences of central Pacific-type El Niño in recent decades, it is suggested that the decadal variation of El Niño caused the intensified Walker circulation over the past 30 years. An analysis of current climate models shows that model results deviate greatly from the observed intensified Walker circulation. The uncertainties in the current climate models may be due to the natural variability dominating the forced signal over the tropical Pacific during the last three decades in the twentieth century climate scenario runs by CMIP3 CGCMs. © 2012 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55073
Appears in Collections: 过去全球变化的重建
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作者单位: School of Earth and Environmental Sciences, Seoul National University, NS80, Seoul, 151-747, South Korea; Department of Environmental Marine Science, Hanyang University, Ansan, South Korea; EUMETSAT, Darmstadt, Germany
Recommended Citation:
Sohn B.J.,Yeh S.-W.,Schmetz J.,et al. Observational evidences of Walker circulation change over the last 30 years contrasting with GCM results[J]. Climate Dynamics,2013-01-01,40(2017-07-08)