DOI: 10.1002/2013MS000273
Scopus记录号: 2-s2.0-84937430126
论文题名: How does the Redi parameter for mesoscale mixing impact global climate in an Earth System Model?
作者: Pradal M ; -A ; , Gnanadesikan A
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 6, 期: 3 起始页码: 586
结束页码: 601
语种: 英语
英文关键词: Atmospheric temperature
; Climate models
; Earth (planet)
; Feedback
; Ice
; Mixing
; Poles
; Sea ice
; Submarine geophysics
; Surface properties
; Surface waters
; climate
; Coupled climate model
; Diffusive transport
; Global climate system
; isopycnal stirring
; Long-wave radiation
; Sea surface temperature (SST)
; Short wave absorption
; Oceanography
; absorption
; air temperature
; convection
; coupling
; global climate
; isopycnal layer
; longwave radiation
; mesoscale eddy
; oceanic circulation
; sea ice
; sea surface temperature
; shortwave radiation
; stratification
; water column
; Pacific Ocean
; Pacific Ocean (North)
; Southern Ocean
英文摘要: A coupled climate model is used to examine the impact of an increase in the mixing due to mesoscale eddies on the global climate system. A sixfold increase in the Redi mixing coefficient ARedi, which is within the admissible range of variation, has the overall effect of warming the global-mean surface air and sea surface temperatures by more than 1°C. Locally, sea surface temperatures increase by up to 7°C in the North Pacific and by up to 4°C in the Southern Ocean, with corresponding impacts on the ice concentration and ice extent in polar regions. However, it is not clear that the changes in heat transport from tropics to poles associated with changing this coefficient are primarily responsible for these changes. We found that the changes in the transport of heat are often much smaller than changes in long-wave trapping and short-wave absorption. Additionally, changes in the advective and diffusive transport of heat toward the poles often oppose each other. However, we note that the poleward transport of salt increases near the surface as ARedi increases. We suggest a causal chain in which enhanced eddy stirring leads to increased high-latitude surface salinity reducing salt stratification and water column stability and enhancing convection, triggering two feedback loops. In one, deeper convection prevents sea ice formation, which decreases albedo, which increases SW absorption, further increasing SST and decreasing sea ice formation. In the other, increased SST and reduced sea ice allow for more water vapor in the atmosphere, trapping long-wave radiation. Destratifying the polar regions is thus a potential way in which changes in ocean circulation might warm the planet. © 2014. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/76023
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD, United States
Recommended Citation:
Pradal M,-A,, Gnanadesikan A. How does the Redi parameter for mesoscale mixing impact global climate in an Earth System Model?[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,6(3)