Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
doi:10.5194/cpd-4-249-2008
© Author(s) 2008. This work is distributed
under the Creative Commons Attribution 3.0 License.
 
25 Feb 2008
Review status
This discussion paper has been under review for the journal Climate of the Past (CP). The manuscript was not accepted for further review after discussion.
Contribution of tree-ring analysis to the study of droughts in northwestern France (XIX–XXth century)
O. Planchon1, V. Dubreuil1, V. Bernard2, and S. Blain3 1COSTEL LETG, UMR 6554 CNRS, Université Rennes-2, Place Recteur H. Le Moal, 35043 Rennes Cedex, France
2Civilisations Atlantiques et Archéosciences UMR 6566 CNRS, Université Rennes-1, 263 Avenue du général Leclerc, 35042 Rennes Cedex, France
3Luminescence Laboratory, Dept. Of Archaeology, University of Durham, South Road, Durham, DH1 3LE / CRPAA UMR5060 IRAMAT CNRS, Université Bordeaux-3, Maison de l'Archéologie 33607 Pessac Cedex, France
Abstract. A tree-ring analysis based on oak samples in the North-West of France showed the effects of droughts periods on the growth index, during the late XIXth and XXth century. Four types of droughts were identified using the results of the tree-ring analysis and the available climate data. The "type 1" was subjected to a continuous and intense drought during all the vegetative period (spring and summer), the "type 2" was subjected to a summer drought succeeding no precipitation deficit in spring, the "type 3" was subjected to a remarkable winter drought and during the years of the "type 4", precipitation deficits were recorded for several but not successive months, over an heterogeneous spatial distribution. The long, intense and countinuous droughts clearly showed a spatial structuring effect on the growth index, especially when the two successive vegetative seasons (spring and summer) recorded strong precipitation deficits combined with shrivellings. These extreme cases involved the lowest growth index over most of the studied area, with some variations due to the altitude and exposure effects on the local-scale spatial distribution of the hydrological stress. The hydrological balance for the station of Rennes (Brittany) confirmed these results in accordance with the intensity and/or duration of drought periods: the most intense droughts of the "type 1" were especially pointed out. A climatic interpretation of growth index data and maps could so be possible over northwestern France with an application to the medieval times and perhaps to other periods, but the cause of the different drought patterns must be more precisely studied during the contemporary period (late XIXth century and all the XXth century).

Citation: Planchon, O., Dubreuil, V., Bernard, V., and Blain, S.: Contribution of tree-ring analysis to the study of droughts in northwestern France (XIX–XXth century), Clim. Past Discuss., 4, 249-270, doi:10.5194/cpd-4-249-2008, 2008.
O. Planchon et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
 
RC S76: 'referee comment', Anonymous Referee #2, 08 Apr 2008 Printer-friendly Version 
 
RC S92: 'comment', Anonymous Referee #1, 16 Apr 2008 Printer-friendly Version 
O. Planchon et al.
O. Planchon et al.

Viewed

Total article views: 610 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
250 308 52 610 24 42

Views and downloads (calculated since 01 Feb 2013)

Cumulative views and downloads (calculated since 01 Feb 2013)

Saved

Discussed

Latest update: 28 Apr 2017
Publications Copernicus
Download
Share