DOI: 10.1175/JCLI-D-15-0533.1
Scopus记录号: 2-s2.0-84971447516
论文题名: Suppression of Atlantic meridional overturning circulation variability at increased CO2
作者: MacMartin D.G. ; Zanna L. ; Tziperman E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 11 起始页码: 4155
结束页码: 4164
语种: 英语
Scopus关键词: Carbon dioxide
; Climate change
; Climatology
; Fourier analysis
; Heat transfer
; Sea ice
; Stochastic systems
; Climate variability
; Inter-decadal variability
; Oceanic variabilities
; Statistical techniques
; Thermohaline circulations
; Variability
; Oceanography
; air-sea interaction
; carbon dioxide
; climate change
; climatology
; decadal variation
; general circulation model
; meridional circulation
; overturn
; statistical analysis
; thermohaline circulation
; Atlantic Ocean
英文摘要: Multidecadal variability in the Atlantic meridional overturning circulation (AMOC) is shown to differ significantly between the 4 × CO2 and preindustrial control simulations of the GFDL Earth System Model, version 2M (ESM2M) general circulation model (GCM). In the preindustrial simulation, this model has a peak in the power spectrum of both AMOC and northward heat transport at latitudes between 26° and 50°N. In the 4 × CO2 simulation, the only significant spectral peak is near 60°N. Understanding these differences is important for understanding the effect of future climate change on climate variability, as well as for providing insight into the physics underlying AMOC variability. Transfer function analysis demonstrates that the shift is predominantly due to a shift in the internal ocean dynamics rather than a change in stochastic atmospheric forcing. Specifically, the reduction in variance from 26° to 45°N is due to an increased stratification east of Newfoundland that results from the shallower and weaker mean overturning. The reduced AMOC variance that accompanies the reduced mean value of the AMOC at 4 × CO2 differs from predictions of simple box models that predict a weaker circulation to be closer to a stability bifurcation point and, therefore, be accompanied by amplified variability. The high-latitude variability in the 4 × CO2 simulation is related to the advection of anomalies by the subpolar gyre, distinct from the variability mechanism in the control simulation at lower latitudes. The 4 × CO2 variability has only a small effect on midlatitude meridional heat transport, but does significantly affect sea ice in the northern North Atlantic. © 2016 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49932
Appears in Collections: 气候变化事实与影响
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作者单位: Computing and Mathematical Sciences, California Institute of Technology, Pasadena, CA, United States; Department of Physics, University of Oxford, Oxford, United Kingdom; Department of Earth and Planetary Sciences, School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States
Recommended Citation:
MacMartin D.G.,Zanna L.,Tziperman E.. Suppression of Atlantic meridional overturning circulation variability at increased CO2[J]. Journal of Climate,2016-01-01,29(11)