DOI: 10.1016/j.quascirev.2014.03.007
Scopus记录号: 2-s2.0-84897371139
论文题名: Deglaciated areas of Kilimanjaro as a source of volcanic trace elements deposited on the ice cap during the late Holocene
作者: Gabrielli P. ; Hardy D.R. ; Kehrwald N. ; Davis M. ; Cozzi G. ; Turetta C. ; Barbante C. ; Thompson L.G.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 93 起始页码: 1
结束页码: 10
语种: 英语
英文关键词: Deglaciation
; Holocene
; Ice accumulation
; Ice cap
; Kilimanjaro
; Snow accumulation
; Volcanic dust
Scopus关键词: Dust
; Glaciers
; Ice control
; Snow
; Stratigraphy
; Volcanoes
; Budget control
; Dust
; Glaciers
; Ice control
; Snow
; Stratigraphy
; Trace elements
; Volcanoes
; Deglaciations
; Holocenes
; Ice accumulation
; Ice-caps
; Kilimanjaro
; Snow accumulation
; Volcanic dust
; Ice
; Ice
; caldera
; deglaciation
; energy balance
; eolian deposit
; glacier mass balance
; glacier retreat
; Holocene
; ice cap
; ice cover
; snow cover
; trace element
; bedrock
; ice field
; mass balance
; snow accumulation
; stratigraphy
; volcanic ash
; Kilimanjaro [Tanzania]
; Tanzania
; Kilimanjaro [Kilimanjaro (RGA)]
英文摘要: Ice fields on Kilimanjaro (5895m a.s.l., Tanzania) are retreating and 85% of the ice cover has been lost since 1912. The degree to which this recession is exceptional during the Holocene is uncertain, as age control of the entire ice stratigraphy exists only for the very shallow and very bottom ice of the Northern Ice Field. This empirical evidence suggests that the Kilimanjaro ice cover may be a persistent Holocene feature, while a model based on maximum possible extent and a constant shrinkage rate of the summit glaciers suggests a cyclic decay time on the order of one to two centuries. Today the mass balance of these ice fields is negative and no persistent ice accumulation zones are observed over multiannual scales. The expanding deglaciated area within the Kilimanjaro caldera should act as an increasingly larger and productive source of volcanic-origin aeolian dust that is quickly deposited onto the surface of the adjacent ice fields, particularly in the seasonal absence of caldera snow cover. Variations in the local dust influx may directly influence albedo and the energy balance of these ice fields. Investigating the characteristics of insoluble material entrapped in the ice remnants of Kilimanjaro can thus provide insights into the extent of ice and/or continuity of the summit snow cover through time. Here we report the trace element composition linked to the insoluble particles entrapped in Holocene Kilimanjaro ice in the context of the current understanding of the past ice accumulation processes (including solid precipitations and ablation) contributing to build the horizontal caldera ice fields. For this purpose we analysed an ice core drilled to bedrock from the Northern Ice Field thought to span the late Holocene (2200 BC-1950 AD). The ultra low trace element concentrations recorded in this Kilimanjaro core are consistent with a generally low volcanic dust source availability (i.e. limited exposure of the deglaciated area in the caldera) and fairly continuous ice accumulation during the late Holocene. In contrast, the maximum concentrations for most of the trace elements recorded in the surface ice section suggest that the current lack of ice accumulation on the Kilimanjaro ice fields is unusual over the last ~4ka. © 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60270
Appears in Collections: 过去全球变化的重建
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作者单位: Byrd Polar Research Center, The Ohio State University, 108 Scott Hall, 1090 Carmack Road, Columbus, OH 43210, United States; School of Earth Sciences, 275 Mendenhall Laboratory, The Ohio State University, 125 South Oval Mall, Columbus, OH 43210, United States; Department of Geosciences, 233 Morrill Science Center, University of Massachusetts, 611 North Pleasant Street, Amherst, MA 01003-9297, United States; Dipartimento di Scienze Ambientali, University Ca'Foscari of Venice, Dorsoduro 2137, 30123 Venice, Italy; Istitutoper la Dinamica dei Processi Ambientali-CNR, Dorsoduro 2137, 30123 Venice, Italy; Accademia Nazionale dei Lincei, Centro B. Segre, Via della Lungara 10, 00196 Rome, Italy
Recommended Citation:
Gabrielli P.,Hardy D.R.,Kehrwald N.,et al. Deglaciated areas of Kilimanjaro as a source of volcanic trace elements deposited on the ice cap during the late Holocene[J]. Quaternary Science Reviews,2014-01-01,93