DOI: 10.1016/j.quascirev.2018.04.024
Scopus记录号: 2-s2.0-85045382706
论文题名: Holocene glacier and climate variations in Vestfirðir, Iceland, from the modeling of Drangajökull ice cap
作者: Anderson L.S. ; Flowers G.E. ; Jarosch A.H. ; Aðalgeirsdóttir G.T. ; Geirsdóttir Á. ; Miller G.H. ; Harning D.J. ; Thorsteinsson T. ; Magnússon E. ; Pálsson F.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 190 起始页码: 39
结束页码: 56
语种: 英语
英文关键词: Deglaciation
; Geomorphology
; Glacial inception
; Glaciation
; Glaciology
; Holocene
; Holocene Thermal Maximum
; Little ice age
; Modelling
; North Atlantic
Scopus关键词: Atmospheric temperature
; Climate models
; Geomorphology
; Glacial geology
; Models
; Oceanography
; Repair
; Snow
; Surface waters
; Deglaciations
; Glacial inception
; Glaciation
; Glaciology
; Holocene thermal maximums
; Holocenes
; Little Ice Age
; North Atlantic
; Ice
; air temperature
; cirque
; climate variation
; deglaciation
; equilibrium line
; general circulation model
; geomorphology
; glacial history
; glaciation
; glacier dynamics
; glaciology
; Holocene
; Hypsithermal
; ice cap
; insolation
; Little Ice Age
; modeling
; Atlantic Ocean
; Atlantic Ocean (North)
; Drangajokull
; Iceland
; Vestfirdir
英文摘要: Drangajökull is a maritime ice cap located in northwest (Vestfirðir) Iceland. Drangajökull's evolution is therefore closely linked to atmospheric and ocean variability. In order to better constrain the Holocene climate and glacier history of Vestfirðir we model the past evolution of Drangajökull ice cap. Simulations from 10 ka to present are forced by general circulation model output, ice-core-based temperature reconstructions, and sea-surface temperature reconstructions. Based on these 10-thousand year simulations, Drangajökull did not persist through the Holocene. We estimate that air temperatures were 2.5–3.0 °C higher during the Holocene Thermal Maximum than the local 1960–1990 average. Simulations support Drangajökull's late Holocene inception between 2 and 1 ka, though intermittent ice likely occupied cirques as early as 2.6 ka. Drangajökull is primarily a Little Ice Age ice cap: it expanded between 1300 and 1750 CE, with the most rapid growth occurring between 1600 and 1750 CE. The maximum Holocene extent of Drangajökull occurred between 1700 and 1925 CE, despite the lowest late Holocene temperatures, occurring between 1650 and 1720 CE. Between 1700 and 1925 CE temperatures were likely 0.6–0.8 °C lower than the 1950–2015 reference temperature. The modern equilibrium line altitude (ELA) is bracketed by topographic thresholds: a 1 °C temperature increase from the modern ELA would eliminate the ice cap's accumulation area, while a reduction of 0.5 °C would lead to the rapid expansion of the ice cap across Vestfirðir. The proximity of Drangajökull to topographic thresholds may explain its late inception and rapid expansion during the Little Ice Age. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112186
Appears in Collections: 气候减缓与适应
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作者单位: Faculty of Earth Sciences, University of Iceland, Öskju, Sturlugötu 7, Reykjavík, 101, Iceland; Department of Earth Sciences, Simon Fraser University, 8888 University Dr., Burnaby, B.C.V5A 1S6, Canada; INSTAAR and Department of Geological Sciences, University of Colorado-Boulder, Campus Box 450, BoulderCO 80309-0450, United States; Icelandic Meteorological Office, Bústaðavegi 7- 9, Reykjavík, 108, Iceland
Recommended Citation:
Anderson L.S.,Flowers G.E.,Jarosch A.H.,et al. Holocene glacier and climate variations in Vestfirðir, Iceland, from the modeling of Drangajökull ice cap[J]. Quaternary Science Reviews,2018-01-01,190