DOI: 10.1175/JCLI-D-11-00682.1
Scopus记录号: 2-s2.0-85023593626
论文题名: Relationship between air-sea density flux and isopycnal meridional overturning circulation in a warming climate
作者: Han M. ; Kamenkovich I. ; Radko T. ; Johns W.E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 8 起始页码: 2683
结束页码: 2699
语种: 英语
Scopus关键词: Climate models
; Oceanography
; Poles
; Intergovernmental panel on climate changes
; Large scale motion
; Maximum transport
; Meridional overturning circulations
; Model simulation
; Northern Hemispheres
; Ocean circulation
; Southern Hemisphere
; Climate change
英文摘要: This study aims to explore the relationship between air-sea density flux and isopycnal meridional overturning circulation (MOC), using the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) model projections of the twenty-first-century climate. The focus is on the semiadiabatic component of MOC beneath the mixed layer; this component is described using the concept of the push-pull mode, which represents the combined effects of the adiabatic push into the deep ocean in the Northern Hemisphere and the pull out of the deep ocean in the Southern Hemisphere. The analysis based on the GFDL Climate Model version 2.1 (CM2.1) simulation demonstrates that the push-pull mode and the actual isopycnal MOC at the equator evolve similarly in the deep layers, with their maximum transports decreasing by 4-5 Sv (1 Sv ≡ 106 m3 s-1) during years 2001-2100. In particular, the push-pull mode and actual isopycnal MOC are within approximately 10% of each other at the density layers heavier than 27.55 kg m-3, where the reduction in the MOC strength is the strongest. The decrease in the push-pull mode is caused by the direct contribution of the anomalous heat, rather than freshwater, surface fluxes. The agreement between the deep push-pull mode and MOC in the values of linear trend and variability on time scales longer than a decade suggests a largely adiabatic pole-to-pole mechanism for these changes. The robustness of the main conclusions is further explored in additional model simulations. © 2013 American Meteorological Society. 资助项目: NSF, Norsk Sykepleierforbund
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52076
Appears in Collections: 气候变化事实与影响
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作者单位: Division of Meteorology and Physical Oceanography, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, United States; Department of Oceanography, Naval Postgraduate School, Monterey, CA, United States
Recommended Citation:
Han M.,Kamenkovich I.,Radko T.,et al. Relationship between air-sea density flux and isopycnal meridional overturning circulation in a warming climate[J]. Journal of Climate,2013-01-01,26(8)