DOI: 10.1175/JCLI-D-16-0790.1
Scopus记录号: 2-s2.0-85021144247
论文题名: Evolution of the Atlantic multidecadal variability in a model with an improved North Atlantic current
作者: Drews A. ; Greatbatch R.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 14 起始页码: 5491
结束页码: 5512
语种: 英语
Scopus关键词: Greenhouse gases
; Oceanography
; Sea ice
; Aerosol loading
; Coupled climate model
; Coupled models
; Greenhouse-gas forcing
; Multidecadal variability
; North Atlantic Currents
; Ocean heat content
; Temporal evolution
; Climate models
英文摘要: This article investigates the dynamics and temporal evolution of the Atlantic multidecadal variability (AMV) in a coupled climate model. The model contains a correction to the North Atlantic flow field to improve the path of the North Atlantic Current, thereby alleviating the surface cold bias, a common problem with climate models, and offering a unique opportunity to study the AMV in a model. Changes in greenhouse gas forcing or aerosol loading are not considered. A striking feature of the results is the contrast between the western and eastern sides of the subpolar gyre in the model. On the western side, anomalous heat supply by the ocean plays a major role, with most of this heat being given up to the atmosphere in the warm phase, largely symmetrically about the time of the AMV maximum. By contrast, on the eastern side, the ocean anomalously gains heat from the atmosphere, with relatively little role for ocean heat supply in the years before the AMV maximum. Thereafter, the balance changes with heat now being anomalously removed from the eastern side by the ocean, leading to a reduced ocean heat content, behavior associated with the establishment of an intergyre gyre at the time of the AMV maximum. In the warm phase, melting sea ice leads to a freshening of surface waters northeast of Greenland that travel southward into the Irminger and Labrador Seas, shutting down convection and terminating the AMV warm phase. © 2017 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48829
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: GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Department of Mathematics and Natural Sciences, University of Kiel, Kiel, Germany
Recommended Citation:
Drews A.,Greatbatch R.J.. Evolution of the Atlantic multidecadal variability in a model with an improved North Atlantic current[J]. Journal of Climate,2017-01-01,30(14)