DOI: 10.1175/JCLI-D-17-0769.1
Scopus记录号: 2-s2.0-85053042289
论文题名: A global glacial ocean state estimate constrained by upper-ocean temperature proxies
作者: Amrhein D.E. ; Wunsch C. ; Marchal O. ; Forget G.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 19 起始页码: 8059
结束页码: 8079
语种: 英语
英文关键词: Abyssal circulation
; Inverse methods
; Ocean
; Ocean models
; Paleoclimate
; Sea surface temperature
Scopus关键词: Atmospheric temperature
; Glacial geology
; Inverse problems
; Sea ice
; State estimation
; Submarine geophysics
; Surface properties
; Surface waters
; Uncertainty analysis
; Upper atmosphere
; Abyssal circulation
; Inverse methods
; Ocean
; Ocean model
; Paleoclimates
; Sea surface temperature (SST)
; Oceanography
英文摘要: We use themethod of least squares with Lagrangemultipliers to fit an ocean general circulation model to the Multiproxy Approach for the Reconstruction of the Glacial Ocean Surface (MARGO) estimate of near sea surface temperature (NSST) at the Last GlacialMaximum (LGM; circa 23-19 thousand years ago). Compared to a modern simulation, the resulting global, last-glacial ocean state estimate, which fits the MARGO data within uncertainties in a free-running coupled ocean-sea ice simulation, has global-mean NSSTs that are 2°C lower and greater sea ice extent in all seasons in both the Northern and SouthernHemispheres. Increased brine rejection by sea ice formation in the Southern Ocean contributes to a stronger abyssal stratification set principally by salinity, qualitatively consistent with pore fluid measurements. The upper cell of the glacial Atlantic overturning circulation is deeper and stronger. Dye release experiments show similar distributions of Southern Ocean source waters in the glacial and modern western Atlantic, suggesting that LGM NSST data do not require a major reorganization of abyssal water masses. Outstanding challenges in reconstructing LGM ocean conditions include reducing effects from model biases and finding computationally efficient ways to incorporate abyssal tracers in global circulation inversions. Progress will be aided by the development of coupled ocean- atmosphere-ice inversemodels, by improving high-latitudemodel processes that connect the upper and abyssal oceans, and by the collection of additional paleoclimate observations. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110667
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Massachusetts Institute of Technology, Woods Hole Oceanographic Institution Joint Program in Oceanography, Cambridge, MA, United States; Harvard University, Cambridge, MA, United States; Woods Hole Oceanographic Institution, Woods Hole, MA, United States; Massachusetts Institute of Technology, Cambridge, MA, United States
Recommended Citation:
Amrhein D.E.,Wunsch C.,Marchal O.,et al. A global glacial ocean state estimate constrained by upper-ocean temperature proxies[J]. Journal of Climate,2018-01-01,31(19)