DOI: 10.1007/s00382-012-1504-z
Scopus记录号: 2-s2.0-84881029215
论文题名: Reinterpreting the thermocline feedback in the western-central equatorial Pacific and its relationship with the ENSO modulation
作者: Dewitte B. ; Yeh S.-W. ; Thual S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 2017-03-04 起始页码: 819
结束页码: 830
语种: 英语
英文关键词: Climate variability
; ENSO asymmetry
; ENSO feedbacks
; ENSO modulation
; Stratification
英文摘要: Vertical stratification changes at low frequency over the last decades are the largest in the western-central Pacific and have the potential to modify the balance between ENSO feedback processes. Here we show evidence of an increase in thermocline feedback in the western-central equatorial Pacific over the last 50 years, and in particular after the climate shift of 1976. It is demonstrated that the thermocline feedback becomes more effective due to the increased stratification in the vicinity of the mean thermocline. This leads to an increase in vertical advection variability twice as large as the increase resulting from the stronger ENSO amplitude (positive asymmetry) in the eastern Pacific that connects to the thermocline in the western-central Pacific through the basin-scale 'tilt' mode. Although the zonal advective feedback is dominant over the western-central equatorial Pacific, the more effective thermocline feedback allows for counteracting its warming (cooling) effect during warm (cold) events, leading to the reduced covariability between SST and thermocline depth anomalies in the NINO4 (160°E-150°W; 5°S-5°N) region after the 1976 climate shift. This counter-intuitive relationship between thermocline feedback strength as derived from the linear relationship between SST and thermocline fluctuations and stratification changes is also investigated in a long-term general circulation coupled model simulation. It is suggested that an increase in ENSO amplitude may lead to the decoupling between eastern and central equatorial Pacific sea surface temperature anomalies through its effect on stratification and thermocline feedback in the central-western Pacific. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54825
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Laboratoire d'Etudes en Géophysique et Océanographie Spatiales, Toulouse, France; Department of Environmental Marine Science, Hanyang University, Ansan, South Korea
Recommended Citation:
Dewitte B.,Yeh S.-W.,Thual S.. Reinterpreting the thermocline feedback in the western-central equatorial Pacific and its relationship with the ENSO modulation[J]. Climate Dynamics,2013-01-01,41(2017-03-04)