# Northern Patagonia 60 Year Tree-Ring Carbon Isotope Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 2.0 # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/21270 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/southamerica/argentina/nubes2017d13c.txt # # Original_Source_URL: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Tree Rings # # Parameter_Keywords: carbon isotopes #--------------------------------------- # Contribution_Date # Date: 2017-01-07 #--------------------------------------- # Title # Study_Name: Northern Patagonia 60 Year Tree-Ring Carbon Isotope Data #-------------------- # Investigators # Investigators: Lavergne, A.; Daux, V.; Villalba, R.; Pierre, M.; Stievenard, M.; Srur, A.M. #-------------------- # Description_and_Notes # Description: 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. # #-------------------- # Publication # Authors: Aliénor Lavergne, Valérie Daux, Ricardo Villalba, Monique Pierre, Michel Stievenard, Ana Marina Srur # Published_Date_or_Year: 2017-02-01 # Published_Title: Improvement of isotope-based climate reconstructions in Patagonia through a better understanding of climate influences on isotopic fractionation in tree rings # Journal_Name: Earth and Planetary Science Letters # Volume: 459 # Edition: # Issue: # Pages: 372-380 # Report_Number: # DOI: 10.1016/j.epsl.2016.11.045 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S0012821X16306793 # Full_Citation: # Abstract: 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. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: CNRS-INSU # Grant: LEFE-PATISO #--------------------------------------- # Funding_Agency # Funding_Agency_Name: CONICET Argentina # Grant: #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Australian Research Council # Grant: ARC DP120104320 #--------------------------------------- # Site_Information # Site_Name: Paso de la Nubes # Location: South America>Argentina # Country: Argentina # Northernmost_Latitude: -41.15 # Southernmost_Latitude: -41.15 # Easternmost_Longitude: -71.8 # Westernmost_Longitude: -71.8 # Elevation: 1274 m #------------------ # Data_Collection # Collection_Name: NUB2017d13C # Earliest_Year: 1952 # Most_Recent_Year: 2011 # Time_Unit: AD # Core_Length: m # Notes: #--------------------------------------- # Species # Species_Name: Nothofagus pumilio (Poepp. & Endl.) Reiche # Common_Name: lenga # Tree_Species_Code: NOPU #--------------------------------------- # Chronology_Information # Chronology: # #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # ## age_AD age, , , AD, , , , ,N ## d13C.cell delta 13C, cellulose,,per mil,,Tree Ring, , analytical technique: isotope ratio mass spectrometry,N # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # age_AD d13C.cell 1952 -24.44 1953 -24.62 1954 -24.46 1955 -24.81 1956 -23.93 1957 -24.52 1958 -24.15 1959 -23.87 1960 -24.76 1961 -23.90 1962 -24.74 1963 -25.52 1964 -25.46 1965 -24.99 1966 -25.14 1967 -25.52 1968 -24.72 1969 -24.33 1970 -24.61 1971 -24.10 1972 -23.90 1973 -24.42 1974 -23.44 1975 -24.98 1976 -24.48 1977 -23.72 1978 -22.89 1979 -23.90 1980 -24.95 1981 -24.57 1982 -24.61 1983 -24.19 1984 -24.73 1985 -24.38 1986 -24.98 1987 -24.49 1988 -24.80 1989 -24.72 1990 -24.04 1991 -24.18 1992 -24.46 1993 -24.73 1994 -24.90 1995 -24.68 1996 -25.21 1997 -25.13 1998 -24.61 1999 -25.48 2000 -25.29 2001 -25.74 2002 -25.50 2003 -24.26 2004 -24.75 2005 -24.44 2006 -25.27 2007 -24.57 2008 -24.89 2009 -25.39 2010 -25.25 2011 -25.54