noaa-tree-21270 Northern Patagonia 60 Year Tree-Ring Carbon Isotope Data Lavergne, A.; Daux, V.; Villalba, R.; Pierre, M.; Stievenard, M.; Srur, A.M. Northern Patagonia 60 Year Tree-Ring Carbon Isotope Data 2017-01-07 NCDC-Paleoclimatology ONLINE Files 10.25921/b952-4r74 https://www.ncdc.noaa.gov/paleo/study/21270 Investigator A. Lavergne Investigator V. Daux Investigator R. Villalba Investigator M. Pierre Investigator M. Stievenard Investigator A.M. Srur earth science paleoclimate tree ring delta 13C,alpha cellulose,null,per mil,null,tree ring,null,isotope ratio mass spectrometry,N,null earth science paleoclimate tree ring age,null,null,year Common Era,null,tree ring,null,null,N,null earth science paleoclimate tree-ring carbon isotopes geoscientificInformation FICU Fitzroya cupressoides (Molina) I.M. Johnst. alerce Patagonian cypress 1952 AD 2011 AD -2 cal yr BP -61 cal yr BP Complete -41.25 -41.13 -71.8 -71.28 950 1612 Continent South America Argentina La Almohadilla>LATITUDE -41.18>LONGITUDE -71.78 Continent South America Argentina Rio Alerce>LATITUDE -41.18>LONGITUDE -71.77 Continent South America Argentina Glaciar Frias 2>LATITUDE -41.13>LONGITUDE -71.8 Continent South America Argentina Paso de la Nubes>LATITUDE -41.15>LONGITUDE -71.8 Continent South America Argentina Challhuaco>LATITUDE -41.25>LONGITUDE -71.28 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 Aliénor Lavergne, Valérie Daux, Ricardo Villalba, Monique Pierre, Michel Stievenard, Ana Marina Srur 2017 Earth and Planetary Science Letters 459 372-380 10.1016/j.epsl.2016.11.045 http://www.sciencedirect.com/science/article/pii/S0012821X16306793

Very few studies of stable isotopes exist across the Andes in South America. This study is the first presenting annually resolved chronologies of both d18O and d13C in Nothofagus pumilio and Fitzroya cupressoides trees from Northern Patagonia. Interannual variability in d18O and d13C was assessed over the period 1952-2011. Based on these chronologies, we determined the primary climatic controls on stable isotopes and tree physiological responses to changes in atmospheric CO2 concentrations (ca), temperature and humidity. Changes in specific intrinsic water use efficiency (iWUE) were inferred from variations in d13C whereas the effects of CO2 increase on stomatal conductance were explored using d18O. Over the 60-year period, iWUE increased significantly (by ca. 25%) in coincidence with the rise of ca. The two species appear to have different strategies of gas-exchange. Whereas iWUE variations were likely driven by both stomatal conductance and photosynthetic assimilation rates in F. cupressoides, they were largely related to stomatal conductance in N. pumilio. After removing the low-frequency trends related to increasing ca, significant relationships between d13C and summer temperatures were recorded for both species. However, d13C variations in F. cupressoides were more strongly influenced by summer temperatures than in N. pumilio. Our results advocate for an indirect effect of summer temperatures on stable isotope ratios, which is mostly influenced by sunlight radiation in F. cupressoides and relative humidity/soil moisture in N. pumilio. d13C variations in F. cupressoides were spatially correlated to a large area south of 35S in southern South America. These promising results encourage the use of d13C variations in F. cupressoides for reconstructing past variations in temperature and large-scale circulation indexes such as the Southern Annular Mode (SAM) in the Southern Hemisphere. STUDY NOTES: Tree-ring carbon isotope (d13C) annual chronologies from 5 sites and two native species (Fitzroya cupressoides and Nothofagus pumilio) in northern Patagonia, Argentina, for the past 60 years. IITRDB23

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/southamerica/argentina/challhuaco2017d13c.txt Formatted Text Data File; Challhuaco Tree-Ring Carbon Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/southamerica/argentina/almohadilla2017d13c.txt Formatted Text Data File; La Almohadilla Tree-Ring Carbon Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/southamerica/argentina/glaciarfrias2017d13c.txt Formatted Text Data File; Glaciar Frias Tree-Ring Carbon Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/southamerica/argentina/nubes2017d13c.txt Formatted Text Data File; Paso de la Nubes Tree-Ring Carbon Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/southamerica/argentina/alerce2017d13c.txt Formatted Text Data File; Rio Alerce Tree-Ring Carbon Isotope Data USA/NOAA DIF Version 9.8.4 2019-03-01 2019-03-01