Modern speleothem oxygen isotope hydroclimate records in water-limited SE Australia
作者： Monika Markowska , Mark O. Cuthbert , Andy Baker , Pauline C. Treble , Martin S. Andersen
DOI: 10.1016/J.GCA.2019.12.007
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摘要: Abstract Dryland regions are generally projected to become drier under future climate change scenarios. Understanding the long-term natural variability of dryland via paleo-reconstructions is therefore highly desirable. The 18O two coeval modern speleothems from Cathedral Cave, Wellington, in semi-arid SE Australia compared instrumental record assess their efficacy as a proxy past hydrological variability. Stalagmite δ18O was found be modulated by frequency recharge events and epikarst evaporation storage water. Prolonged intervals between events, such droughts, resulted higher stalagmite δ18O. Conversely, periods with more frequent positive water balance, lower Disequilibrium cave processes likely enhanced during dry conditions, although it argued that these will modulate δ18Ospel same direction evaporation, effectively amplifying response Extreme floods were also captured records, potentially lag several years. We verify can used reconstruct hydroclimate due variations karst processes. Such records archives changes rather than precipitation amount or surface temperature, commonly applied speleothem non-water-limited regions.
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