DOI: 10.1175/JCLI-D-12-00717.1
Scopus记录号: 2-s2.0-84886255402
论文题名: Frequency domain multimodel analysis of the response of Atlantic meridional overturning circulation to surface forcing
作者: Macmartin D.G. ; Tziperman E. ; Zanna L.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 21 起始页码: 8323
结束页码: 8340
语种: 英语
Scopus关键词: Atlantic meridional overturning circulations
; Atlantic Ocean
; Community climate system model
; Coupled Model Intercomparison Project
; Geophysical fluid dynamics laboratories
; Meridional overturning circulations
; Ocean dynamics
; Sea surface temperature (SST)
; Computer simulation
; Frequency domain analysis
; Oceanography
; Systematic errors
; Transfer functions
; Climate models
; atmosphere-ocean coupling
; atmospheric forcing
; climate modeling
; general circulation model
; meridional circulation
; overturn
; Rossby wave
; sea surface salinity
; sea surface temperature
; transfer function
; wind stress
; Atlantic Ocean
; Labrador Sea
英文摘要: The dynamics of the Atlantic meridional overturning circulation (AMOC) vary considerably among different climate models; for example, some models show clear peaks in their power spectra while others do not. To elucidate these model differences, transfer functions are used to estimate the frequency domain relationship between surface forcing fields, including sea surface temperature, salinity, and wind stress, and the resulting AMOC response. These are estimated from the outputs of the Coupled Model Intercomparison Project phase 5 (CMIP5) and phase 3 (CMIP3) control runs for eight different models, with a specific focus on Geophysical Fluid Dynamics Laboratory Climate Model, version 2.1 (GFDL CM2.1), and the Community Climate System Model, version 4 (CCSM4), which exhibit rather different spectral behavior. The transfer functions show very little agreement among models for any of the pairs of variables considered, suggesting the existence of systematic model errors and that considerable uncertainty in the simulation of AMOCin current climate models remains. However, a robust feature of the frequency domain analysis is that models with spectral peaks in their AMOC correspond to those in which AMOC variability is more strongly excited by high-latitude surface perturbations that have periods corresponding to the frequency of the spectral peaks. This explains why different models exhibit such different AMOC variability. These differences would not be evident without using a method that explicitly computes the frequency dependence rather than a priori assuming a particular functional form. Finally, transfer functions are used to evaluate two proposed physical mechanisms for model differences in AMOC variability: differences in Labrador Sea stratification and excitation by westward-propagating subsurface Rossby waves. © 2013 American Meteorological Society. 资助项目: DOE, U.S. Department of Energy
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51540
Appears in Collections: 气候变化事实与影响
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作者单位: Control and Dynamical Systems, California Institute of Technology, Pasadena, CA, United States; Earth and Planetary Sciences, School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States; Atmospheric, Oceanic, and Planetary Physics, University of Oxford, Oxford, United Kingdom
Recommended Citation:
Macmartin D.G.,Tziperman E.,Zanna L.. Frequency domain multimodel analysis of the response of Atlantic meridional overturning circulation to surface forcing[J]. Journal of Climate,2013-01-01,26(21)