DOI: 10.1007/s00382-014-2358-3
Scopus记录号: 2-s2.0-84925463337
论文题名: Effect of surface restoring on subsurface variability in a climate model during 1949–2005
作者: Ray S. ; Swingedouw D. ; Mignot J. ; Guilyardi E.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 44, 期: 2017-09-10 起始页码: 2333
结束页码: 2349
语种: 英语
英文关键词: Decadal climate prediction
; Initial conditions
; Subsurface reconstruction
; Surface nudging
英文摘要: Initializing the ocean for decadal predictability studies is a challenge, as it requires reconstructing the little observed subsurface trajectory of ocean variability. In this study we explore to what extent surface nudging using well-observed sea surface temperature (SST) can reconstruct the deeper ocean variations for the 1949–2005 period. An ensemble made with a nudged version of the IPSLCM5A model and compared to ocean reanalyses and reconstructed datasets. The SST is restored to observations using a physically-based relaxation coefficient, in contrast to earlier studies, which use a much larger value. The assessment is restricted to the regions where the ocean reanalyses agree, i.e. in the upper 500 m of the ocean, although this can be latitude and basin dependent. Significant reconstruction of the subsurface is achieved in specific regions, namely region of subduction in the subtropical Atlantic, below the thermocline in the equatorial Pacific and, in some cases, in the North Atlantic deep convection regions. Beyond the mean correlations, ocean integrals are used to explore the time evolution of the correlation over 20-year windows. Classical fixed depth heat content diagnostics do not exhibit any significant reconstruction between the different existing observation-based references and can therefore not be used to assess global average time-varying correlations in the nudged simulations. Using the physically based average temperature above an isotherm (14 °C) alleviates this issue in the tropics and subtropics and shows significant reconstruction of these quantities in the nudged simulations for several decades. This skill is attributed to the wind stress reconstruction in the tropics, as already demonstrated in a perfect model study using the same model. Thus, we also show here the robustness of this result in an historical and observational context. © 2014, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54237
Appears in Collections: 过去全球变化的重建
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作者单位: LOCEAN/IPSL, Sorbonne Universités, UPMC-CNRS-IRD-MNHN, Case Courrier 100, 4 Place Jussieu, Paris Cedex 05, France; EPOC, CNRS-University of Bordeaux, Pessac, France; Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland; Oeschger Centre of Climate Change Research, University of Bern, Bern, Switzerland; NCAS-Climate, University of Reading, Reading, United Kingdom
Recommended Citation:
Ray S.,Swingedouw D.,Mignot J.,et al. Effect of surface restoring on subsurface variability in a climate model during 1949–2005[J]. Climate Dynamics,2015-01-01,44(2017-09-10)