DOI: 10.1175/JCLI-D-15-0329.1
Scopus记录号: 2-s2.0-84950157209
论文题名: Using single-forcing GCM simulations to reconstruct and interpret quaternary climate change
作者: Erb M.P. ; Jackson C.S. ; Broccoli A.J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 24 起始页码: 9746
结束页码: 9767
语种: 英语
Scopus关键词: Atmospheric thermodynamics
; Carbon dioxide
; Climate models
; Climatology
; Earth (planet)
; Glaciers
; Greenhouse gases
; Ice
; Oceanography
; Orbits
; Precipitation (chemical)
; Precipitation (meteorology)
; Repair
; Sea ice
; Temperature
; Atlantic meridional overturning circulations
; Climate variability
; Equilibrium simulations
; General circulation model
; Last Glacial Maximum
; Linear reconstruction
; Monsoons
; Paleoclimates
; Climate change
; air temperature
; atmospheric general circulation model
; atmospheric modeling
; atmospheric structure
; climate variation
; computer simulation
; monsoon
; paleoclimate
; precipitation (climatology)
; Quaternary
英文摘要: The long-term climate variations of the Quaternary were primarily influenced by concurrent changes in Earth's orbit, greenhouse gases, and ice sheets. However, because climate changes over the coming century will largely be driven by changes in greenhouse gases alone, it is important to better understand the separate contributions of each of these forcings in the past. To investigate this, idealized equilibrium simulations are conducted in which the climate is driven by separate changes in obliquity, precession, CO2, and ice sheets. To test the linearity of past climate change, anomalies from these single-forcing experiments are scaled and summed to compute linear reconstructions of past climate, which are then compared to mid-Holocene and last glacial maximum (LGM) snapshot simulations, where all forcings are applied together, as well as proxy climate records. This comparison shows that much of the climate response may be approximated as a linear response to forcings, while some features, such as modeled changes in sea ice and Atlantic meridional overturning circulation (AMOC), appear to be heavily influenced by nonlinearities. In regions where the linear reconstructions replicate the full-forcing experiments well, this analysis can help identify how each forcing contributes to the climate response. Monsoons at the mid-Holocene respond strongly to precession, while LGM monsoons are heavily influenced by the altered greenhouse gases and ice sheets. Contrary to previous studies, ice sheets produce pronounced tropical cooling at the LGM. Compared to proxy temperature records, the linear reconstructions replicate long-term changes well and also show which climate variations are not easily explained as direct responses to long-term forcings. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50797
Appears in Collections: 气候变化事实与影响
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作者单位: Institute for Geophysics, The University of Texas at Austin, Austin, TX, United States; Department of Environmental Sciences, Institute of Earth, Ocean and Atmospheric Sciences, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States
Recommended Citation:
Erb M.P.,Jackson C.S.,Broccoli A.J.. Using single-forcing GCM simulations to reconstruct and interpret quaternary climate change[J]. Journal of Climate,2015-01-01,28(24)