DOI: 10.1016/j.epsl.2017.12.027
Scopus记录号: 2-s2.0-85038626645
论文题名: Middle-to-late Holocene palaeoenvironmental reconstruction from the A294 ice-cave record (Central Pyrenees, northern Spain)
作者: Sancho C. ; Belmonte Á. ; Bartolomé M. ; Moreno A. ; Leunda M. ; López-Martínez J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 484 起始页码: 135
结束页码: 144
语种: 英语
英文关键词: Central Pyrenees
; firn ice cave
; Holocene climate
; isotopic composition
; radiocarbon dating
Scopus关键词: Atmospheric pressure
; Caves
; Climate change
; Deposits
; Isotopes
; Stratigraphy
; Cross stratifications
; Holocene climate
; Isotopic composition
; North Atlantic oscillations
; Palaeoclimatic record
; Palaeoenvironmental reconstruction
; Pyrenees
; Radiocarbon dating
; Ice
; cave
; climate variation
; diagenesis
; geological record
; Holocene
; ice
; isotopic composition
; lacustrine deposit
; North Atlantic Oscillation
; paleoclimate
; paleoenvironment
; radiocarbon dating
; reconstruction
; stratigraphy
; warming
; Iberian Peninsula
; Pyrenees
; Spain
英文摘要: Perennial ice deposits in caves represent unique, but underexplored, terrestrial sequences that potentially contain outstanding palaeoclimatic records. Here, we present a pioneer palaeoenvironmental study of an ice deposit preserved in a small sag-type cave (A294) in the Central Pyrenees (northern Iberian Peninsula). The 9.25-m-thick sequence, which is dated from 6100 ± 107 to 1888 ± 64 cal BP, represents the oldest known firn ice record worldwide. The stratigraphy (detrital layers, unconformities, and cross stratification), plant macrofossils, and isotopic signature (similarity between the ice linear distribution, δ2H=7.83δ18O+8.4, and the Global Meteoric Water Line) of the ice point to the diagenesis of snow introduced to the cave by winter snowstorms. Four phases of rapid ice accumulation (6100–5515, 4945–4250, 3810–3155, and 2450–1890 cal BP) are related to wetter and colder winters. Comparison of the isotopic composition (δ18O and deuterium excess) of the ice with other paleoclimate records show that both source effects and the North Atlantic Oscillation (NAO) mechanism exert a dominant influence on the ice cave record. The NAO signal may be a combination of source effects and rainfall amount. Three intervals with low ice accumulation occurred between the phases of rapid accumulation and were related to drier, and possibly warmer, winters. These centennial-scale episodes appear to be in-phase with regional arid events, as established from high altitude lacustrine records and can be correlated to global Rapid Climate Change events. The current warming trend has dramatically decreased the volume of the ice deposit in cave A294. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110051
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: Universidad de Zaragoza, Pedro Cerbuna 12, Zaragoza, 50009, Spain; Instituto Pirenaico de Ecología, CSIC, Avda. de Montañana 1005, Zaragoza, 50059, Spain; Universidad Autónoma de Madrid, Facultad de Ciencias, Madrid, 28049, Spain
Recommended Citation:
Sancho C.,Belmonte Á.,Bartolomé M.,et al. Middle-to-late Holocene palaeoenvironmental reconstruction from the A294 ice-cave record (Central Pyrenees, northern Spain)[J]. Earth and Planetary Science Letters,2018-01-01,484