DOI: 10.1007/s00382-011-1124-z
Scopus记录号: 2-s2.0-84862998573
论文题名: Mechanisms for decadal scale variability in a simulated Atlantic meridional overturning circulation
作者: Medhaug I. ; Langehaug H.R. ; Eldevik T. ; Furevik T. ; Bentsen M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 39, 期: 2017-01-02 起始页码: 77
结束页码: 93
语种: 英语
英文关键词: Atlantic Meridional Overturning Circulation
; Convection
; Decadal variability
; Deep water formation
; Water mass transformations
英文摘要: Variability in the Atlantic Meridional Overturning Circulation (AMOC) has been analysed using a 600-year pre-industrial control simulation with the Bergen Climate Model. The typical AMOC variability has amplitudes of 1 Sverdrup (1 Sv = 106 m3 s-1) and time scales of 40-70 years. The model is reproducing the observed dense water formation regions and has very realistic ocean transports and water mass distributions. The dense water produced in the Labrador Sea (1/3) and in the Nordic Seas, including the water entrained into the dense overflows across the Greenland-Scotland Ridge (GSR; 2/3), are the sources of North Atlantic Deep Water (NADW) forming the lower limb of the AMOC's northern overturning. The variability in the Labrador Sea and the Nordic Seas convection is driven by decadal scale air-sea fluxes in the convective region that can be related to opposite phases of the North Atlantic Oscillation. The Labrador Sea convection is directly linked to the variability in AMOC. Linkages between convection and water mass transformation in the Nordic Seas are more indirect. The Scandinavian Pattern, the third mode of atmospheric variability in the North Atlantic, is a driver of the ocean's poleward heat transport (PHT), the overall constraint on northern water mass transformation. Increased PHT is both associated with an increased water mass exchange across the GSR, and a stronger AMOC. © 2011 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55221
Appears in Collections: 过去全球变化的重建
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作者单位: Geophysical Institute, University of Bergen, Allegaten 70, 5007 Bergen, Norway; Bjerknes Centre for Climate Research, Bergen, Norway; Nansen Environmental and Remote Sensing Center, Bergen, Norway; Uni Bjerknes Centre, Uni Research, Bergen, Norway
Recommended Citation:
Medhaug I.,Langehaug H.R.,Eldevik T.,et al. Mechanisms for decadal scale variability in a simulated Atlantic meridional overturning circulation[J]. Climate Dynamics,2012-01-01,39(2017-01-02)