DOI: 10.1175/JCLI-D-16-0810.1
Scopus记录号: 2-s2.0-85028398980
论文题名: Low-pass filtering, heat flux, and Atlantic multidecadal variability
作者: Cane M.A. ; Clement A.C. ; Murphy L.N. ; Bellomo K.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 18 起始页码: 7529
结束页码: 7553
语种: 英语
Scopus关键词: Atmospheric temperature
; Atmospheric thermodynamics
; Digital storage
; Heat flux
; Low pass filters
; Statistics
; Stochastic models
; Stochastic systems
; Submarine geophysics
; Surface properties
; Surface waters
; White noise
; Analytic expressions
; Atlantic multidecadal oscillations
; Atmosphere-ocean interactions
; Coupled models
; Low-frequency signals
; Multidecadal variability
; Oceanic mixed layers
; Sea surface temperature (SST)
; Oceanography
英文摘要: In this model study the authors explore the possibility that the internal component of the Atlantic multidecadal oscillation (AMO) sea surface temperature (SST) signal is indistinguishable from the response to white noise forcing from the atmosphere and ocean. Here, complex models are compared without externally varying forcing with a one-dimensional noise-driven model for SST. General analytic expressions are obtained for both unfiltered and low-pass filtered lead-lag correlations. It is shown that this simple model reproduces many of the simulated lead-lag relationships among temperature, rate of change of temperature, and surface heat flux. It is concluded that the finding that at low frequencies the ocean loses heat to the atmosphere when the temperature is warm, which has been interpreted as showing that the ocean circulation drives the AMO, is a necessary consequence of the fact that at long periods the net heat flux (ocean plus atmosphere) is zero to a good approximation. It does not distinguish between the atmosphere and ocean as the source of the AMO and is consistent with the hypothesis that the AMO is driven by white noise heat fluxes. It is shown that some results in the literature are artifacts of low-pass filtering, which creates spurious low-frequency signals when the underlying data are white or red noise. It is concluded that in the absence of external forcing the AMO in most GCMs is consistent with being driven by white noise, primarily from the atmosphere. © 2017 American Meteorological Society. 资助项目: Columbia University
; NASA, National Aeronautics and Space Administration
; NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48708
Appears in Collections: 气候减缓与适应 气候变化与战略
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作者单位: Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States
Recommended Citation:
Cane M.A.,Clement A.C.,Murphy L.N.,et al. Low-pass filtering, heat flux, and Atlantic multidecadal variability[J]. Journal of Climate,2017-01-01,30(18)