A multi-proxy approach to drought reconstruction

Quaternaire (2016)

Inga Labuhn Valérie Daux Dominique Genty

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Abstract:

In palaeoclimate reconstructions, the combination of proxy records measured in different climate archives is challenging because of the uncertainties associated with each proxy, but it can also help reduce some of these uncertainties. Here, we present a novel approach to combine speleothem and tree ring proxies for a drought reconstruction of the last 640 years: a fluid inclusion δ18O record from a stalagmite from Villars Cave (southwest France) and a tree ring cellulose δ18O record of Quercus spp. from the nearby Angoulême area. The δ18O of the fluid inclusions is taken as an estimate of the δ18O of the trees' source water. Then, the cellulose and source water δ18O are used to calculate the leaf water isotopic enrichment, as well as relative humidity, which is the dominant controlling factor of this enrichment. The reconstructed long-term trends in relative humidity differ from a previously published reconstruction of moisture variability based on the tree ring record alone. Further measurements will be necessary to support either reconstruction. Nevertheless, this investigation demonstrates the great potential for combining isotope proxies from speleothems and tree rings to reconstruct both the low- and high-frequency variability of drought.

Keywords:

Speleothem

Stalagmite

δ18O

Proxy (statistics)

Topics:

Tree-ring climate responses

Plant Water Relations and Carbon Dynamics

Geology and Paleoclimatology Research

10.4000/quaternaire.7632

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Speleothems

Elsevier eBooks (2007)

Henry P. Schwarcz

Speleothem

Stalagmite

δ18O

Ice core

10.1016/b0-444-52747-8/00352-5

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Citations (0)

In situ measurement of seasonal δ18O variations and analysis of isotopic trends in a modern speleothem from southwest Australia

Earth and Planetary Science Letters (2005)

Pauline C. Treble John Chappell Michael K. Gagan K. D. McKeegan T. Mark Harrison

Speleothem

Stalagmite

δ18O

Seasonality

Ice core

10.1016/j.epsl.2005.02.013

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Citations (119)

δ~(18)O variation during 54-46 ka recorded by a stalagmite from Northeast Sichuan, Central China and its relationship with summer monsoon evolution

Geochimica (2007)

Houyun Zhou

TIMS U-Th dating and high-resolution oxygen isotopic composition measurements were conducted on a stalagmite SI3 collected from Shizi cave, Nuoshuihe, northeastern Sichuan, Central China. The stalagmite SI3 was developed between 54-46 ka. Its δ18O record displays a high similarity with those of stalagmites MSL and MSD from Hulu cave, East China and D4 from Dongge cave, Southwest China, respectively. The trend of the δ18O record of SI3 also parallels with those of ice core GISP2 from polar area and of speleothem in Israel. These suggest that the δ18O record of SI3 is closely related with summer monsoon variation in East Asia. However, some evidences seem to suggest that carbonates in SI3 are more 18O enriched than those deposited under oxygen isotopic equilibrium condition. There was probably kinetic fractionation when SI3 was developed. This may be explained by the locus of SI3 that was collected near the entrance of Shizi cave. The possible mechanism between the δ18O record of SI3 and the variation in East Asian summer monsoon was speculated. It is suggested that in the East Asian summer monsoon domain, the δ18O record of some speleothem deposited even under nonequilibrium condition is still a potential proxy for summer monsoon variation.

Stalagmite

Speleothem

δ18O

East Asian Monsoon

Ice core

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Oxygen isotopic fractionation between drip water and speleothem calcite: A 10-year monitoring study, central Texas, USA

Chemical Geology (2012)

Weimin Feng Jay L. Banner Amber L. Guilfoyle MaryLynn Musgrove Eric W. James

Speleothem