DOI: 10.1016/j.quascirev.2015.04.004
Scopus记录号: 2-s2.0-84928963313
论文题名: The Holocene history of the North American Monsoon: 'known knowns' and 'known unknowns' in understanding its spatial and temporal complexity
作者: Metcalfe S.E. ; Barron J.A. ; Davies S.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 120 起始页码: 1
结束页码: 27
语种: 英语
英文关键词: Climate modelling
; Forcings
; Holocene
; North American Monsoon (NAM)
; Seasonality
Scopus关键词: Atmospheric thermodynamics
; Climate models
; Cooling systems
; Ice
; Nickel
; Rain
; Anthropogenic activity
; Atlantic multidecadal oscillations
; Forcings
; Holocenes
; Medieval Climate Anomaly (MCA)
; North American
; Pacific decadal oscillation
; Seasonality
; Climate change
; Atlantic Multidecadal Oscillation
; climate forcing
; climate modeling
; climate variation
; complexity
; El Nino
; Holocene
; La Nina
; Laurentide Ice Sheet
; monsoon
; orbital forcing
; Pacific Decadal Oscillation
; paleoclimate
; precipitation (climatology)
; proxy climate record
; seasonality
; spatiotemporal analysis
; Younger Dryas
; Atlantic Ocean
; Caribbean Sea
; Central America
; Mexico [North America]
; Mexico [North America]
; Yucatan
英文摘要: Evidence for climatic change across the North American Monsoon (NAM) and adjacent areas is reviewed, drawing on continental and marine records and the application of climate models. Patterns of change at 12,000, 9000, 6000 and 4000calyrBP are presented to capture the nature of change from the Younger Dryas (YD) and through the mid-Holocene. At the YD, conditions were cooler overall, wetter in the north and drier in the south, while moving into the Holocene wetter conditions became established in the south and then spread north as the NAM strengthened. Until c. 8000calyrBP, the Laurentide Ice Sheet influenced precipitation in the north by pushing the Bermuda High further south. The peak extent of the NAM seems to have occurred around 6000calyrBP. 4000calyrBP marks the start of important changes across the NAM region, with drying in the north and the establishment of the clear differences between the summer-rain dominated south and central areas and the north, where winter rain is more important. This differentiation between south and north is crucial to understanding many climate responses across the NAM. This increasing variability is coincident with the declining influence of orbital forcing. 4000calyrBP also marks the onset of significant anthropogenic activity in many areas. For the last 2000 years, the focus is on higher temporal resolution change, with strong variations across the region. The Medieval Climate Anomaly (MCA) is characterised by centennial scale 'megadrought' across the southwest USA, associated with cooler tropical Pacific SSTs and persistent La Niña type conditions. Proxy data from southern Mexico, Central America and the Caribbean reveal generally wetter conditions, whereas records from the highlands of central Mexico and much of the Yucatan are typified by long -term drought. The Little Ice Age (LIA), in the north, was characterised by cooler, wetter winter conditions that have been linked with increased frequency of El Niño's. Proxy records in the central and southern regions reveal generally dry LIA conditions, consistent with cooler SSTs in the Caribbean and Gulf of Mexico. This synthesis demonstrates that in some periods, one major forcing can dominate across the whole area (e.g. insolation in the early-mid Holocene), but at other times there is strong variability in patterns of change due to the differential impact of forcings such as the Pacific Decadal Oscillation (PDO) and the Atlantic Multidecadal Oscillation (AMO) on precipitation seasonality. © 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59912
Appears in Collections: 过去全球变化的重建
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作者单位: School of Geography, University of Nottingham, Nottingham, United Kingdom; Volcano Science Center, U.S. Geological Survey, 345 Middlefield Road, MS910, Menlo Park, CA, United States; Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom
Recommended Citation:
Metcalfe S.E.,Barron J.A.,Davies S.J.. The Holocene history of the North American Monsoon: 'known knowns' and 'known unknowns' in understanding its spatial and temporal complexity[J]. Quaternary Science Reviews,2015-01-01,120