What controls the cave drip water temperature? Analysis and implications for paleoclimate reconstruction from speleothems

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dc.contributor.authorRau, GCen_AU
dc.contributor.authorCuthbert, MOen_AU
dc.contributor.authorAndersen, MSen_AU
dc.contributor.authorBaker, AAen_AU
dc.contributor.authorRutlidge, Hen_AU
dc.contributor.authorMarkowska, Men_AU
dc.contributor.authorRoshan, Hen_AU
dc.contributor.authorMarjo, CEen_AU
dc.contributor.authorGraham, PWen_AU
dc.contributor.authorAckworth, RIen_AU
dc.date.accessioned2022-08-30T22:00:40Zen_AU
dc.date.available2022-08-30T22:00:40Zen_AU
dc.date.issued2015-11-03en_AU
dc.date.statistics2021-11-04en_AU
dc.description.abstractCave drip water temperature influences cave hydrobiochemical processes and also speleothem based paleoclimate signals (e.g. biomarkers, isotopes, etc). Yet very little is known about what controls cave drip water temperature. This experimental investigation reveals the dominant heat transfer mechanisms. Design and Methodology: A shallow cave drip water flow path along a flowstone was instrumented with a number of high resolution temperature sensors and drip loggers. Cave and surface climate parameters: Pressure, Relative Humidity (RH) and Temperature were monitored with high frequency. Three separate land surface irrigation experiments were conducted comprising of multiple applications of water at the surface above the cave. One of the irrigation batched was enriched with deuterium (610% VSMOW) as a conservative tracer. The cave drip water temperature measurements clearly reveal the presence of all common heat transport mechanisms (e.g. conduction, convection, latent heat exchange). In general, the cave drip water has the same temperature as the subsurface conduction profile of the rock at that depth. However, at fast flow rates the warmer/colder signal during summer/winter is being washed down convectively leading to temperature anomalies of up 1.5 °C. Importantly, daily cave venting reduces the cave RH thus leading to evaporative cooling of drip water of up -2.5 °C. Cave drip water temperature is mainly controlled by the subsurface heat conduction profile as well as the cave climate. This, however, depends on the drip rate and length of flow path exposed to the cave air. Paleoclimate reconstruction requires depth-dependent deconvolution of the subsurface conduction signal as well as consideration of past or present cave venting and evaporative cooling.en_AU
dc.identifier.citationRau, 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. (2015). What controls the cave drip water temperature? Analysis and implications for paleoclimate reconstruction from speleothems. Paper presented to the Australian Groundwater Conference, The Shine Dome Canberra, 3-5 November 2015. Retrieved from: http://groundwater.com.au/documents/conference-program_2015.pdfen_AU
dc.identifier.conferenceenddate5 November 2015en_AU
dc.identifier.conferencenameAustralian Groundwater Conferenceen_AU
dc.identifier.conferenceplaceCanberra, Australiaen_AU
dc.identifier.conferencestartdate3 November 2015en_AU
dc.identifier.urihttp://groundwater.com.au/documents/conference-program_2015.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13684en_AU
dc.language.isoenen_AU
dc.publisherNational Centre for Groundwater Research And Trainingen_AU
dc.subjectCavesen_AU
dc.subjectWateren_AU
dc.subjectTemperature rangeen_AU
dc.subjectIsotopesen_AU
dc.subjectExperiment resultsen_AU
dc.subjectHumidityen_AU
dc.subjectIrrigationen_AU
dc.subjectDeuteriumen_AU
dc.subjectTracer techniquesen_AU
dc.subjectCoolingen_AU
dc.titleWhat controls the cave drip water temperature? Analysis and implications for paleoclimate reconstruction from speleothemsen_AU
dc.typeConference Abstracten_AU
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