ANSTO Publications Online >
Journal Publications >
Journal Articles >

Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/5962

Title: Drip water isotopes in semi-arid karst: implications for speleothem paleoclimatology.
Authors: Cuthbert, MO
Baker, A
Jex, CN
Graham, PW
Treble, PC
Andersen, MS
Acworth, RI
Keywords: Groundwater recharge
Stable isotopes
Arid lands
Isotopes
Evaporation
Water
Issue Date: 1-Jun-2014
Publisher: Elsevier Science BV
Citation: Cuthbert, M. O., Baker, A., Jex, C. N., Graham, P. W., Treble, P. C., Andersen, M. S., & Acworth, R. I. (2014). Drip water isotopes in semi-arid karst: implications for speleothem paleoclimatology. Earth and Planetary Science Letters, 395, 194-204. doi:http://dx.doi.org/10.1016/j.epsl.2014.03.034
Abstract: We report the results of the first multi-year monitoring and modelling study of the isotopic composition of drip waters in a semi-arid karst terrane. High temporal resolution drip rate monitoring combined with monthly isotope drip water and rainfall sampling at Cathedral Cave, Australia, demonstrates that drip water discharge to the cave occurs irregularly, and only after occasional long duration and high volume rainfall events, where the soil moisture deficit and evapotranspiration is overcome. All drip waters have a water isotopic composition that is heavier than the weighted mean annual precipitation, some fall along the local meteoric water line, others trend towards an evaporation water line. It is hypothesised that, in addition to the initial rainfall composition, evaporation of unsaturated zone water, as well as the time between infiltration events, are the dominant processes that determine infiltration water isotopic composition. We test this hypothesis using a soil moisture balance and isotope model. Our research reports, for the first time, the potential role of sub-surface evaporation in altering drip water isotopic composition, and its implications for the interpretation of speleothem delta O-18 records from arid and semi-arid regions. © 2014, Elsevier Ltd.
URI: http://dx.doi.org/10.1016/j.epsl.2014.03.034
http://apo.ansto.gov.au/dspace/handle/10238/5962
ISSN: 0012-821X
Appears in Collections:Journal Articles

Files in This Item:

There are no files associated with this item.

Items in APO are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback