A 1,500 year south Australian rainfall record based on speleothem hydrological proxies

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dc.contributor.authorMcDonald, Jen_AU
dc.contributor.authorDrysdale, RNen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorHodge, Een_AU
dc.contributor.authorTreble, PCen_AU
dc.contributor.authorGreig, Aen_AU
dc.contributor.authorFallon, SJen_AU
dc.contributor.authorLee, Sen_AU
dc.contributor.authorHellstrom, JCen_AU
dc.date.accessioned2015-12-28T01:53:06Zen_AU
dc.date.available2015-12-28T01:53:06Zen_AU
dc.date.issued2013-02-11en_AU
dc.date.statistics2015-11-26en_AU
dc.description.abstractCave drip water studies at Wombeyan Caves (34°19’S, 149°59’E) demonstrated a marked hydrochemical response to wet/dry phases (McDonald Et al. 2004; 2007). Geochemical Variations in three 20th Century coeval active Speleothems were able to be linked to the instrumental record. Subsequently geochemical relationships were investigated in a long record speleothem(WM7) which grew deeper within the same cave system. Obtaining a robust chronology proved to be challenging, due to the young age of the speleothem and very low uranium concentrations (~10 ppb) the use of U‚Aeseries disequilibrium dating was ineffective to produce a robust chronology. Chronology for WM7 was based on a dense sequence of DCF corrected ages using three different age-­‐depth models: Clam (Classical method), and Bacon and OxCal (Bayesian statistical approach) (Hua et al. 2012).The new chronology indicated that WM7 began growth around 4400 cal BP(171 mm). However, since sampling from 0-­‐50mm was most intensive, the model is based on this part of the stalagmite and indicates that the top 50 mm of WM7 grew during the past 1360 and 1740 years. An aridity index based on Sr,P, Y, La, and Ba shows that over the last 1,500 years several sustained episodes of wet/arid and otherwise variable phases have occurred. Two sustained wet phases ~ 700-­‐880 AD and ~ 900-­‐ 1250 AD were followed by ~ 400 years of variable wet/dry conditions, although from ~1300 to 1600 AD a drying trend is indicated, but punctuated by several wetter episodes. The last 200 years indicate sustained drying phases. The OE￥13C record is anomalous from ~ 1880 to present and attributed to the stalagmite’s recording of increasing contribution of fossil fuel to CO2 concentrations. Within the longer-­‐time scale oscillations, higher resolution (~ 2-­‐5 years) variability is evident, replicating the trend shown by modern annually resolved stalagmites at this site.en_AU
dc.identifier.citationMcDonald, J., Drysdale, R., Hua, Q., Hodge, E., Treble, P., Greig, A., Fallon, S., Lee, S., & Hellstrom, J. (2013). A 1,500 year south Australian rainfall record based on speleothem hydrological proxies. Paper presented at the 19th National Conference of the Australian Meteorological and Oceanographic Society (AMOS), 11-13 February 2013 at the Melbourne Convention and Exhibition Centre, Melbourne, Australia.en_AU
dc.identifier.conferenceenddate13 February 2013en_AU
dc.identifier.conferencename19th National Conference of the Australian Meteorological and Oceanographic Society (AMOS)en_AU
dc.identifier.conferenceplaceMelbourne, Australiaen_AU
dc.identifier.conferencestartdate11 February 2013en_AU
dc.identifier.govdoc6319en_AU
dc.identifier.urihttp://www.weather-climate.com/AMOSconf2013_648.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6486en_AU
dc.language.isoenen_AU
dc.publisherAMOS National Conferenceen_AU
dc.subjectCavesen_AU
dc.subjectUraniumen_AU
dc.subjectFossil fuelsen_AU
dc.subjectCarbon dioxideen_AU
dc.subjectOscillationsen_AU
dc.subjectWashouten_AU
dc.titleA 1,500 year south Australian rainfall record based on speleothem hydrological proxiesen_AU
dc.typeConference Abstracten_AU
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