DOI: 10.1016/j.quascirev.2015.06.001
Scopus记录号: 2-s2.0-84945465878
论文题名: Impacts of cave air ventilation and in-cave prior calcite precipitation on Golgotha Cave dripwater chemistry, southwest Australia
作者: Treble P.C. ; Fairchild I.J. ; Griffiths A. ; Baker A. ; Meredith K.T. ; Wood A. ; McGuire E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 127 起始页码: 61
结束页码: 72
语种: 英语
英文关键词: Cave monitoring
; Cave ventilation
; Dripwater
; Fire
; Prior calcite precipitation
; Speleothem
Scopus关键词: Alkalinity
; Calcite
; Catchments
; Degassing
; Fires
; Forestry
; Groundwater
; Hydrochemistry
; Hydrogeology
; Hydrology
; Isotopes
; Magnesium
; Strontium
; Trace elements
; Ventilation
; Biogeochemical fluxes
; Calcite precipitation
; Dripwater
; Hydrochemical process
; Modelling techniques
; Prior calcite precipitations
; Southwest western australia
; Speleothem
; Caves
; calcite
; cave
; forest fire
; hydrochemistry
; Mediterranean environment
; precipitation (chemistry)
; proxy climate record
; sediment chemistry
; speleothem
; stalactite
; trace element
; ventilation
; Australia
; Golgotha Cave
英文摘要: Speleothem trace element chemistry is an important component of multi-proxy records of environmental change but a thorough understanding of hydrochemical processes is essential for its interpretation. We present a dripwater chemistry dataset (PCO2, alkalinity, Ca, SIcc, Mg and Sr) from an eight-year monitoring study from Golgotha Cave, building on a previous study of hydrology and dripwater oxygen isotopes (Treble et al., 2013). Golgotha Cave is developed in Quaternary aeolianite and located in a forested catchment in the Mediterranean-type climate of southwest Western Australia. All dripwaters from each of the five monitored sites become supersaturated with respect to calcite during most of the year when cave ventilation lowers PCO2 in cave air. In this winter ventilation mode, prior calcite precipitation (PCP) signals of increased Mg/Ca and Sr/Ca in dripwater are attributed to stalactite deposition. A fast-dripping site displays less-evolved carbonate chemistry, implying minimal stalactite growth, phenomena which are attributed to minimal degassing because of the short drip interval (30 s).We employ hydrochemical mass-balance modelling techniques to quantitatively investigate the impact of PCP and CO2 degassing on our dripwater. Initially, we reverse-modelled dripwater solutions to demonstrate that PCP is dominating the dripwater chemistry at our low-flow site and predict that PCP becomes enhanced in underlying stalagmites. Secondly, we forward-modelled the ranges of solution Mg/Ca variation that potentially can be caused by degassing and calcite precipitation to serve as a guide to interpreting the resulting stalagmite chemistry. We predict that stalagmite trace element data from our high-flow sites will reflect trends in original dripwater solutes, preserving information on biogeochemical fluxes within our system. By contrast, stalagmites from our low-flow sites will be dominated by PCP effects driven by cave ventilation. Our poorly karstified system allows us to highlight and quantify these in-cave (PCP) processes, which are otherwise masked at sites where karstification is more developed and hydrogeology is more complex. Our modelling also shows enhanced CO2 source production in the unsaturated zone that is attributed to deeply-rooted vegetation and increasing bioproductivity which we link to forest recovery after fires impacted our site during 2006 CE. © 2015. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59799
Appears in Collections: 过去全球变化的重建
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作者单位: Institute for Environmental Research, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia; School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, United Kingdom; Connected Waters Initiative Research Centre, University of New South Wales Australia, Sydney, NSW, Australia; Department of Parks and Wildlife, 14 Queen St, Busselton, WA, Australia
Recommended Citation:
Treble P.C.,Fairchild I.J.,Griffiths A.,et al. Impacts of cave air ventilation and in-cave prior calcite precipitation on Golgotha Cave dripwater chemistry, southwest Australia[J]. Quaternary Science Reviews,2015-01-01,127