DOI: 10.1007/s00382-017-3756-0
Scopus记录号: 2-s2.0-85020545385
论文题名: Effect of AMOC collapse on ENSO in a high resolution general circulation model
作者: Williamson M.S. ; Collins M. ; Drijfhout S.S. ; Kahana R. ; Mecking J.V. ; Lenton T.M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-07-08 起始页码: 2537
结束页码: 2552
语种: 英语
英文关键词: Abrupt climate change
; AMOC
; AMOC collapse
; CGCM
; ENSO
; Hosing experiment
Scopus关键词: atmospheric general circulation model
; climate change
; climate modeling
; Ekman transport
; El Nino-Southern Oscillation
; meridional circulation
; stochasticity
; temperature anomaly
; thermocline
; Atlantic Ocean
; Pacific Ocean
; Pacific Ocean (Equatorial)
; Pacific Ocean (Tropical)
英文摘要: We look at changes in the El Niño Southern Oscillation (ENSO) in a high-resolution eddy-permitting climate model experiment in which the Atlantic Meridional Circulation (AMOC) is switched off using freshwater hosing. The ENSO mode is shifted eastward and its period becomes longer and more regular when the AMOC is off. The eastward shift can be attributed to an anomalous eastern Ekman transport in the mean equatorial Pacific ocean state. Convergence of this transport deepens the thermocline in the eastern tropical Pacific and increases the temperature anomaly relaxation time, causing increased ENSO period. The anomalous Ekman transport is caused by a surface northerly wind anomaly in response to the meridional sea surface temperature dipole that results from switching the AMOC off. In contrast to a previous study with an earlier version of the model, which showed an increase in ENSO amplitude in an AMOC off experiment, here the amplitude remains the same as in the AMOC on control state. We attribute this difference to variations in the response of decreased stochastic forcing in the different models, which competes with the reduced damping of temperature anomalies. In the new high-resolution model, these effects approximately cancel resulting in no change in amplitude. © 2017, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109352
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Earth System Science Group, College of Life and Environmental Sciences, University of Exeter, Laver Building, North Park Road, Exeter, EX4 4QE, United Kingdom; College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, United Kingdom; Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, SO14 3ZH, United Kingdom; Hadley Centre, Met Office, Exeter, United Kingdom
Recommended Citation:
Williamson M.S.,Collins M.,Drijfhout S.S.,et al. Effect of AMOC collapse on ENSO in a high resolution general circulation model[J]. Climate Dynamics,2018-01-01,50(2018-07-08)