noaa-recon-20002 France 670 Year Tree-Ring d18O Data and SPEI Drought Reconstruction Labuhn, I.; Daux, V.; Girardclos, O.; Stievenard, M.; Pierre, M.; Masson-Delmotte, V. France 670 Year Tree-Ring d18O Data and SPEI Drought Reconstruction 2016-05-03 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20002 Investigator I. Labuhn Investigator V. Daux Investigator O. Girardclos Investigator M. Stievenard Investigator M. Pierre Investigator V. Masson-Delmotte earth science paleoclimate climate reconstructions|tree ring age,null,null,year Common Era,null,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate climate reconstructions|tree ring standardized precipitation evapotranspiration index,delta 18O,null,dimensionless,Jun-Aug,climate reconstructions|tree ring,null,null,N,cellulose delta 18O earth science paleoclimate tree ring delta 18O,latewood cellulose,null,per mil VSMOW,null,tree ring,anomalized,isotope ratio mass spectrometry,N,anomalized from total record mean earth science paleoclimate tree ring delta 18O,cellulose,null,per mil VSMOW,null,tree ring,anomalized,null,N,null earth science paleoclimate climate reconstructions|tree ring standardized precipitation evapotranspiration index,null,95% confidence interval upper bound,dimensionless,Jun-Aug,climate reconstructions|tree ring,null,null,N,null earth science paleoclimate tree ring age,null,null,year Common Era,null,tree ring,null,null,N,null earth science paleoclimate reconstructions precipitation geoscientificInformation Other Hydroclimate Reconstruction Precipitation Reconstruction drought 1326 AD 2004 AD 624 cal yr BP -54 cal yr BP Complete 45.7333 48.45 .3 2.68 136 144 Continent Europe Western Europe France Seine-et-Marne Fontainebleau>LATITUDE 48.45>LONGITUDE 2.68 Continent Europe Western Europe France Angoulême>LATITUDE 45.7333>LONGITUDE .3 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Inga Labuhn, Valérie Daux, Olivier Girardclos, Michel Stievenard, Monique Pierre, and Valérie Masson-Delmotte 2016 Climate of the Past 12 1101-1117 10.5194/cp-12-1101-2016 http://www.clim-past.net/12/1101/2016/

The reconstruction of droughts is essential for the understanding of past drought dynamics and can help evaluate future drought scenarios in a changing climate. This article presents a reconstruction of summer droughts in France based on annually resolved, absolutely dated chronologies of oxygen isotope ratios (δ18O) in tree ring cellulose from Quercus spp. Samples were taken from living trees and timber wood from historic buildings at two sites: Fontainebleau (48°23′ N, 2°40′ E; 1326–2000 CE) and Angoulême (45°44′ N, 0°18′ E; 1360–2004 CE). Cellulose δ18O from these sites proved to be a good proxy of summer climate, as the trees were sensitive to temperature and moisture availability. However, offsets in average δ18O values between tree cohorts necessitated a correction before joining them to the final chronologies. Using the corrected δ18O chronologies, we developed models based on linear regression to reconstruct drought, expressed by the standardized precipitation evapotranspiration index (SPEI). The significant correlations between the SPEI and cellulose δ18O (r ≈ −0.70), as well as the verification of the models by independent data support the validity of these reconstructions. At both sites, recent decades are characterized by increasing drought. Fontainebleau displays dominantly wetter conditions during earlier centuries, whereas the current drought intensity is not unprecedented in the Angoulême record. While the δ18O chronologies at the two studied sites are highly correlated during the 19th and 20th centuries, there is a significant decrease in the correlation coefficient between 1600 and 1800 CE, which indicates either a weaker climate sensitivity of the tree ring proxies during this period, or a more heterogeneous climate in the north and the south of France. Future studies of tree ring isotope networks might reveal if the seasonality and spatial patterns of past droughts can explain this decoupling. A regional drought reconstruction based on a combination of the two sites shows good agreement with historical records of grape harvest dates in France, which provide another proxy of summer climate. STUDY NOTES: Tree ring cellulose delta18O time series from Fontainebleau (FON) and Angouleme (ANG) and their average (mean), expressed as anomalies. The analytical error is 0.2 permil. Drought reconstructions for June-July-August based on these delta18O time series. Drought is expressed by the SPEI (Standardized Precipitation Evapotranspiration Index). IITRDB19

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/europe/france/fontainebleau2016.txt Data File; Fontainebleau Cellulose d18O Data and SPEI Reconstruction GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/europe/france/ang-font2016.txt Data File; Angoulême/Fontainebleau Mean Cellulose d18O Data and SPEI Reconstruction GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/europe/france/angouleme2016.txt Data File; Angoulême Cellulose d18O Data and SPEI Reconstruction USA/NOAA DIF Version 9.8.4 2019-03-01 2019-03-01