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A multi-proxy approach to drought reconstruction

Labuhn, Inga LU ; Daux, Valérie and Genty, Dominique (2016) In Quaternaire 27(3). p.239-247
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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Cellulose, Drought, Fluid inclusions, France, Multi-proxy, Oxygen (δO), Palaeoclimate, Speleothems, Stable isotopes, Tree rings
in
Quaternaire
volume
27
issue
3
pages
9 pages
publisher
Association francaise pour l'etude du quaternaire
external identifiers
  • scopus:84998910100
ISSN
1142-2904
DOI
10.4000/quaternaire.7632
language
English
LU publication?
yes
id
3e7d0e05-5841-4bc0-9dbe-987d0d4e6649
date added to LUP
2016-12-20 14:04:37
date last changed
2017-01-01 08:44:00
@article{3e7d0e05-5841-4bc0-9dbe-987d0d4e6649,
  abstract     = {<p>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 δ<sup>18</sup>O record from a stalagmite from Villars Cave (southwest France) and a tree ring cellulose δ<sup>18</sup>O record of Quercus spp. from the nearby Angoulême area. The δ<sup>18</sup>O of the fluid inclusions is taken as an estimate of the δ<sup>18</sup>O of the trees' source water. Then, the cellulose and source water δ<sup>18</sup>O 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.</p>},
  author       = {Labuhn, Inga and Daux, Valérie and Genty, Dominique},
  issn         = {1142-2904},
  keyword      = {Cellulose,Drought,Fluid inclusions,France,Multi-proxy,Oxygen (δO),Palaeoclimate,Speleothems,Stable isotopes,Tree rings},
  language     = {eng},
  month        = {09},
  number       = {3},
  pages        = {239--247},
  publisher    = {Association francaise pour l'etude du quaternaire},
  series       = {Quaternaire},
  title        = {A multi-proxy approach to drought reconstruction},
  url          = {http://dx.doi.org/10.4000/quaternaire.7632},
  volume       = {27},
  year         = {2016},
}