DOI: 10.1007/s00382-013-1716-x
Scopus记录号: 2-s2.0-84886727842
论文题名: Changes in tropical Atlantic interannual variability from a substantial weakening of the meridional overturning circulation
作者: Polo I. ; Dong B.W. ; Sutton R.T.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 2017-09-10 起始页码: 2765
结束页码: 2784
语种: 英语
英文关键词: Atlantic Meridional Overturning Circulation
; El Niño-Southern Oscillation
; Tropical Atlantic interannual variability
英文摘要: In response to a substantial weakening of the Atlantic Meridional Overturning Circulation (AMOC)-from a coupled ocean-atmosphere general circulation model experiment-significant changes in the interannual variability are found over the tropical Atlantic, characterized by an increase of variance (by ~150 %) in boreal late spring-early summer and a decrease of variance (by ~60 %) in boreal autumn. This study focuses on understanding physical mechanisms responsible for these changes in interannual variability in the tropical Atlantic. It demonstrates that the increase of variability in spring is a consequence of an increase in the variance of the El Niño-Southern Oscillation, which has a large impact on the tropical Atlantic via anomalous surface heat fluxes. Winter El Niño (La Niña) affects the eastern equatorial Atlantic by decreasing (increasing) cloud cover and surface wind speed which is associated with anomalous downward (upward) short wave radiation and reduced (enhanced) upward latent heat fluxes, creating anomalous positive (negative) sea surface temperature (SST) anomalies over the region from winter to spring. On the other hand, the decrease of SST variance in autumn is due to a deeper mean thermocline which weakens the impact of the thermocline movement on SST variation. The comparison between the model results and observations is not straightforward owing to the influence of model biases and the lack of a major MOC weakening event in the instrumental record. However, it is argued that the basic physical mechanisms found in the model simulations are likely to be robust and therefore have relevance to understanding tropical Atlantic variability in the real world, perhaps with modified seasonality. © 2013 Springer-Verlag Berlin Heidelberg. 资助项目: National Centre for Atmospheric Science
; University of Reading
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54738
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: NCAS-Climate, Department of Meteorology, University of Reading, PO Box 243, Earley Gate, Reading, RG6 6BB, United Kingdom
Recommended Citation:
Polo I.,Dong B.W.,Sutton R.T.. Changes in tropical Atlantic interannual variability from a substantial weakening of the meridional overturning circulation[J]. Climate Dynamics,2013-01-01,41(2017-09-10)