DOI: 10.1016/j.gloplacha.2016.06.001
论文题名: What determines the calcium concentration of speleothem-forming drip waters?
作者: Baker A. ; Flemons I. ; Andersen M.S. ; Coleborn K. ; Treble P.C.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 143 起始页码: 152
结束页码: 161
语种: 英语
英文关键词: Calcium
; Carbon dioxide
; Drip water
; Soil
; Vadose
Scopus关键词: Carbon
; Carbon dioxide
; Caves
; Climate change
; Climatology
; Forestry
; Groundwater
; Groundwater geochemistry
; Hydrochemistry
; Ions
; Soils
; Calcium ion concentration
; Drip waters
; Equilibrium modelling
; Hydrochemical evolution
; Hydrogeochemical evolution
; Prior calcite precipitations
; Systematic literature review
; Vadose
; Calcium
; calcium
; carbon dioxide
; concentration (composition)
; deposition
; dissolution
; drip irrigation
; environmental change
; global change
; growth rate
; microbial activity
; proxy climate record
; respiration
; speleothem
; vadose zone
; water availability
英文摘要: Cave drip water calcium ion concentration is a primary determinant of speleothem deposition and growth rate. The factors that determine drip water calcium ion concentrations are the soil and vadose zone CO2 concentrations, and the hydrogeochemical evolution of the water from soil to cave. Here, we use a systematic literature review of cave drip water calcium concentrations, combined with PHREEQC equilibrium modelling, to investigate the global relationship between calcium concentration and surface climate. Our results are discussed in the context of understanding the climatic and environmental controls on drip water calcium concentration, speleothem growth rates and proxies of past climate and environmental change. We use an empirical, global soil CO2 concentration–temperature relationship to derive PHREEQC modelled cave drip water calcium concentrations. The global mean modelled drip water calcium concentration is close to that observed, but it over-predicts at high and low temperatures, and significantly under-predicts at temperate conditions. We hypothesise that closed system hydrochemical evolution due to water saturation is an important control on carbonate dissolution at colder temperatures. Under warmer conditions, for example temperate climates with a dry and hot or warm summer, seasonally-limited water availability can lead to: < 100% soil cover; water-limitations on microbial and root respiration; wildfire; and prior calcite precipitation, all of which limit drip water calcium concentrations. In temperate climates with no dry season, higher CO2 concentrations than modelled from soil values are necessary to explain the observed drip water calcium values, which we propose is from an additional source of CO2 from microbial activity and root respiration in the vadose zone during open system hydrochemical evolution. © 2016 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84975889691&doi=10.1016%2fj.gloplacha.2016.06.001&partnerID=40&md5=3500e73aa51a8884c23dd6c43807b1c5
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11657
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Connected Waters Initiative Research Centre, UNSW Australia, Sydney, NSW, Australia
Recommended Citation:
Baker A.,Flemons I.,Andersen M.S.,et al. What determines the calcium concentration of speleothem-forming drip waters?[J]. Global and Planetary Change,2016-01-01,143.