DOI: 10.1175/JCLI-D-18-0438.1
Scopus记录号: 2-s2.0-85060520092
论文题名: Oceanic overturning and heat transport: The role of background diffusivity
作者: Hieronymus M. ; Nycander J. ; Nilsson J. ; Döös K. ; Hallberg R.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2019
卷: 32, 期: 3 起始页码: 701
结束页码: 716
语种: 英语
英文关键词: Diapycnal mixing
; Diffusion
; Energy transport
; Ocean circulation
Scopus关键词: Climate models
; Diffusion
; Heat transfer
; Mixing
; Oceanography
; Sea ice
; Coupled climate model
; Diapycnal diffusion
; Diapycnal mixing
; Energy transport
; Large-scale impacts
; Meridional heat transports
; Ocean circulation
; Potential temperature
; Atmospheric movements
英文摘要: The role of oceanic background diapycnal diffusion for the equilibrium climate state is investigated in the global coupled climate model CM2G. Special emphasis is put on the oceanic meridional overturning and heat transport. Six runs with the model, differing only by their value of the background diffusivity, are run to steady state and the statistically steady integrations are compared. The diffusivity changes have large-scale impacts on many aspects of the climate system. Two examples are the volume-mean potential temperature, which increases by 3.6°C between the least and most diffusive runs, and the Antarctic sea ice extent, which decreases rapidly as the diffusivity increases. The overturning scaling with diffusivity is found to agree rather well with classical theoretical results for the upper but not for the lower cell. An alternative empirical scaling with the mixing energy is found to give good results for both cells. The oceanic meridional heat transport increases strongly with the diffusivity, an increase that can only partly be explained by increases in the meridional overturning. The increasing poleward oceanic heat transport is accompanied by a decrease in its atmospheric counterpart, which keeps the increase in the planetary energy transport small compared to that in the ocean. © 2019 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117235
Appears in Collections: 气候变化与战略
There are no files associated with this item.
Recommended Citation:
Hieronymus M.,Nycander J.,Nilsson J.,et al. Oceanic overturning and heat transport: The role of background diffusivity[J]. Journal of Climate,2019-01-01,32(3)