DOI: 10.1007/s00382-013-1904-8
Scopus记录号: 2-s2.0-84881095086
论文题名: Weakening AMOC connects Equatorial Atlantic and Pacific interannual variability
作者: Svendsen L. ; Kvamstø N.G. ; Keenlyside N.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 43, 期: 11 起始页码: 2931
结束页码: 2941
语种: 英语
英文关键词: Atlantic Meridional Overturning Circulation
; Atlantic Niño
; Atlantic Zonal Mode
; Bergen Climate Model
; El Niño–Southern Oscillation
; Interannual variability
英文摘要: Observations indicate that since the 1970s Equatorial Atlantic sea surface temperature (SST) variations in boreal summer tend to modulate El Niño in the following seasons, indicating that the Atlantic Ocean can have importance for predicting the El Niño–Southern Oscillation (ENSO). The cause of the change in the recent decades remains unknown. Here we show that in the Bergen Climate Model (BCM), a freshwater forced weakening of the Atlantic meridional overturning circulation (AMOC) results in a strengthening of the relation between the Atlantic and the Pacific similar to that observed since the 1970s. During the weakening AMOC phase, SST and precipitation increase in the central Equatorial Atlantic, while the mean state of the Pacific does not change significantly. In the Equatorial Atlantic the SST variability has also increased, with a peak in variability in boreal summer. In addition, the characteristic timescales of ENSO variability is shifted towards higher frequencies. TheBCM version used here is flux-adjusted, and hence Atlantic variability is realistic in contrast to in many other models. These results indicate that in the BCM a weakening AMOC can change the mean background state of the Tropical Atlantic surface conditions, enhancing Equatorial Atlantic variability, and resulting in a stronger relationship between the Tropical Atlantic and Pacific Oceans. This in turn alters the variability in the Pacific. © 2013, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55034
Appears in Collections: 过去全球变化的重建
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作者单位: Nansen Environmental and Remote Sensing Center, Thormøhlens gate 47, Bergen, Norway; Geophysical Institute, University of Bergen, Bergen, Norway; Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway
Recommended Citation:
Svendsen L.,Kvamstø N.G.,Keenlyside N.. Weakening AMOC connects Equatorial Atlantic and Pacific interannual variability[J]. Climate Dynamics,2013-01-01,43(11)