globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2015.03.026
Scopus记录号: 2-s2.0-84935033481
论文题名:
Controls on cave drip water temperature and implications for speleothem-based paleoclimate reconstructions
作者: Rau G.C.; Cuthbert M.O.; Andersen M.S.; Baker A.; Rutlidge H.; Markowska M.; Roshan H.; Marjo C.E.; Graham P.W.; Acworth R.I.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 127
起始页码: 19
结束页码: 36
语种: 英语
英文关键词: Drip water temperature ; Paleoclimate archive ; Speleology heat transport ; Speleometeorology
Scopus关键词: Atmospheric temperature ; Caves ; Evaporation ; Heat transfer ; Process control ; Surface properties ; Temperature ; Biogeochemical process ; Drip waters ; Ground surface temperature ; Heat transport ; Paleoclimate reconstruction ; Paleoclimates ; Speleometeorology ; Subsurface temperature ; Infiltration ; biogeochemical cycle ; evaporation ; heat transfer ; infiltration ; latent heat flux ; paleoclimate ; speleology ; speleothem ; stalactite ; surface temperature ; thermal regime ; water temperature ; Australia ; New South Wales ; Wellington [New South Wales]
英文摘要: While several studies explore cave climate and thermal regimes, little is known about the controls on cave drip water temperature. Yet water temperature significantly influences biogeochemical processes associated with cave drips. To identify the processes that control the cave drip water temperature, we measured the temperatures at multiple locations along a speleothem flow path and drip sources (stalactites) concurrently with the drip rates in Cathedral Cave, Wellington, Australia. We monitored long-term drip water temperature, drip rates, surface and cave climate and in-cave evaporation rates and conducted 3 infiltration experiments with different flow, temperature and isotopic conditions. Our results show that the drip water temperature is controlled by multiple superimposed heat transport mechanisms that act upon the infiltrating water in the epikarst, the water film after it enters the cave and before it becomes a drip. The two main heat sources/sinks for drip water are the cave air and the surrounding rock. The subsurface temperature is coupled to the surface temperature by conduction through the soil and rock mass, but the cave climate is also coupled to the surface climate by venting. On a regional scale, drip temperatures are mainly driven by the annual ground surface temperature signal but damped with depth and shifted in time compared to the surface. On a local scale, the drip water temperature can differ significantly from cave air and speleothem temperature due to the latent heat exchange of evaporation and localised water film convection. The main controls are ground surface temperature, subsurface depth, air density induced ventilation, distance from entry and drip rate. We present a conceptual model that explains drip water temperature signals and provide signal driven guidance on best type and location for speleothem sampling. We anticipate that our results will significantly improve the understanding of temperature-dependent paleoclimate signals from speleothem archives. © 2015 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59797
Appears in Collections:过去全球变化的重建

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作者单位: Connected Waters Initiative Research Centre, UNSW Australia, 110 King Street, Manly Vale, Australia; Connected Waters Initiative Research Centre, UNSW Australia, Sydney, NSW, Australia; School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, United Kingdom; Mark Wainwright Analytical Centre, UNSW Australia, Sydney, NSW, Australia; Australian Nuclear Science and Technology Organisation, Lucas HeightsNSW, Australia; SGA Environmental, Suite 8, 599 Pacific Highway, St Leonards, NSW, Australia

Recommended Citation:
Rau G.C.,Cuthbert M.O.,Andersen M.S.,et al. Controls on cave drip water temperature and implications for speleothem-based paleoclimate reconstructions[J]. Quaternary Science Reviews,2015-01-01,127
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