DOI: 10.1016/j.quascirev.2013.12.016
Scopus记录号: 2-s2.0-84892838664
论文题名: Late-Holocene land surface change in a coupled social-ecological system, southern Iceland: A cross-scale tephrochronology approach
作者: Streeter R. ; Dugmore A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 86 起始页码: 99
结束页码: 114
语种: 英语
英文关键词: Grímsvötn
; Iceland
; Little Ice Age
; Resilience
; Soil erosion
Scopus关键词: Icelands
; Little Ice Age
; Resilience
; Sediment accumulation
; Social-ecological systems
; Socio-ecological systems
; Soil erosion
; Spatial correlations
; Erosion
; Sediments
; Stratigraphy
; Surface measurement
; Climate change
; accumulation
; depositional environment
; Holocene
; land surface
; land use change
; soil erosion
; stratigraphy
; tephra
; tephrochronology
; volcanic eruption
; Iceland
; Skaftartunga
英文摘要: The chronological challenge of cross-scale analysis within coupled socio-ecological systems can be met with tephrochronology based on numerous well-dated tephra layers. We illustrate this with an enhanced chronology from Skaftártunga, south Iceland that is based on 200 stratigraphic profiles and 2635 individual tephra deposits from 23 different eruptions within the last 1140 years. We present new sediment-accumulation rate based dating of tephra layers from Grímsvötn in AD 1432±5 and AD 1457±5. These and other tephras underpin an analysis of land surface stability across multiple scales. The aggregate regional sediment accumulation records suggest a relatively slow rate of land surface change which can be explained by climate and land use change over the period of human occupation of the island (after AD ~870), but the spatial patterning of change shows that it is more complex, with landscape scale hysteresis and path dependency making the relationship between climate and land surface instability contingent. An alternative steady state of much higher rates of sediment accumulation is seen in areas below 300m asl after AD ~870 despite large variations in climate, with two phases of increased erosion, one related to vegetation change (AD 870-1206) and another related to climate (AD 1597-1918). In areas above 300m asl there is a short lived increase in erosion and related deposition after settlement (AD ~870-935) and then relatively little additional change to present. Spatial correlation between rates of sediment accumulation at different profiles decreases rapidly after AD ~935 from ~4km to less than 250m as the landscape becomes more heterogeneous. These new insights are only possible using high-resolution tephrochronology applied spatially across a landscape, an approach that can be applied to the large areas of the Earth's surface affected by the repeated fallout of cm-scale tephra layers. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60382
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography and Sustainable Development, School of Geography and Geology, Irvine Building, St Andrews KY16 9AL, United Kingdom; Institute of Geography, School of GeoSciences, Drummond Street, Edinburgh EH8 9XP, United Kingdom
Recommended Citation:
Streeter R.,Dugmore A.. Late-Holocene land surface change in a coupled social-ecological system, southern Iceland: A cross-scale tephrochronology approach[J]. Quaternary Science Reviews,2014-01-01,86