DOI: 10.5194/cp-14-157-2018
Scopus记录号: 2-s2.0-85041894075
论文题名: Insights into Atlantic multidecadal variability using the Last Millennium Reanalysis framework
作者: Singh H.K.A. ; Hakim G.J. ; Tardif R. ; Emile-Geay J. ; Noone D.C.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2018
卷: 14, 期: 2 起始页码: 157
结束页码: 174
语种: 英语
Scopus关键词: albedo
; Atlantic Multidecadal Oscillation
; data assimilation
; paleoclimate
; proxy climate record
; reconstruction
; sea ice
; top of atmosphere
; wavelet analysis
; Arctic
; Arctic Ocean
; Greenland
; Iceland
; Norwegian Sea
英文摘要: The Last Millennium Reanalysis (LMR) employs a data assimilation approach to reconstruct climate fields from annually resolved proxy data over years 0-2000ĝ-CE. We use the LMR to examine Atlantic multidecadal variability (AMV) over the last 2 millennia and find several robust thermodynamic features associated with a positive Atlantic Multidecadal Oscillation (AMO) index that reveal a dynamically consistent pattern of variability: The Atlantic and most continents warm; sea ice thins over the Arctic and retreats over the Greenland, Iceland, and Norwegian seas; and equatorial precipitation shifts northward. The latter is consistent with anomalous southward energy transport mediated by the atmosphere. Net downward shortwave radiation increases at both the top of the atmosphere and the surface, indicating a decrease in planetary albedo, likely due to a decrease in low clouds. Heat is absorbed by the climate system and the oceans warm. Wavelet analysis of the AMO time series shows a reddening of the frequency spectrum on the 50-to 100-year timescale, but no evidence of a distinct multidecadal or centennial spectral peak. This latter result is insensitive to both the choice of prior model and the calibration dataset used in the data assimilation algorithm, suggesting that the lack of a distinct multidecadal spectral peak is a robust result. © 2018 Author. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109594
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: Pacific Northwest National Laboratory, US Department of Energy, Richland, WA, United States; Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Department of Earth Sciences, University of Southern California, Los Angeles, CA, United States; College of Earth Ocean, and Atmospheric Sciences, Corvallis, OR, United States
Recommended Citation:
Singh H.K.A.,Hakim G.J.,Tardif R.,et al. Insights into Atlantic multidecadal variability using the Last Millennium Reanalysis framework[J]. Climate of the Past,2018-01-01,14(2)