Tree Isotope Data from Evans and Schrag (2004) : Readme file --------------------------------------------------------------------- NOAA Paleoclimatology Program and World Data Center A - for Paleoclimatology --------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Tree Isotope Data from Evans and Schrag (2004) LAST UPDATE: 8/2007 (Original Receipt by WDCA Paleo) CONTRIBUTORS: Michael N. Evans (University of Arizona) and Daniel P. Schrag (Harvard University) IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: TBD SUGGESTED DATA CITATION: Evans, M.N and D.P. Schrag, Tree Isotope Data from Evans and Schrag (2004), 2007, IGBP PAGES/World Data Center-A for Paleoclimatology Data Contribution Series # 2007-XXX. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Evans, M.N. and D.P. Schrag, A stable isotope-based approach to tropical isotope dendroclimatology, Geochimica et Cosmochimica Acta, 68(16), 3295-3305, DOI: 10.1016/j.gca.2004.01.006, 2004. GEOGRAPHIC REGION: central Massachusetts, USA; northwestern Costa Rica; Eastern Costa Rica; northwestern coastal Peru. PERIOD OF RECORD: 1905 to 1916; 1965-2000; 1985-2001; 1992-2001. FUNDING SOURCES: National Oceanographic and Atmospheric Administration and National Science Foundation, USA LIST OF FILES: readme.txt (this file), ASCII data files hfdata.dat, lidata.dat, lsdata.dat, pidata.dat (described below). DESCRIPTION: Tree Isotope Data from Evans and Schrag (2004) Site Lat. Lon. Elev. Environment Genus & Species Age Information Datafile Petersham, MA 42N 72W 186m temperate Pinus strobus ring structure hfdat.dat Liberia, Costa Rica 10N 85W 300m dry tropical Cordia sp. radiocarbon lidat.dat La Selva, Costa Rica 10N 84W 40m wet tropical Hyeronima alchorneoides plantation lsdat.dat Piura, Peru 5S 81W 49m dry tropical Prosopis sp. plantation ppdat.dat FILE1: hfdat.dat VARIABLE NAMES: COLUMN 1: depth COLUMN 2: age_model COLUMN 3: o18_mean COLUMN 4: o18_std o18 is shorthand for delta 18O, the deviation of the 18O/16O ratio in a sample from a known standard ratio, expressed in per mil units: o18 = delta 18O = (Rsamp/Rstd - 1)*1000 [per mil units] where R = 18O/16O. VARIABLE UNITS: COLUMN 1: depth (mm), with 0 arbitrarily set to most recent tree growth COLUMN 2: years, based on age model described in Evans and Schrag (2004) COLUMN 3: per mil, relative to the Standard Mean Ocean Water (SMOW) standard COLUMN 4: per mil, relative to the SMOW standard DATA PRECISION (1 STANDARD DEVIATION): COLUMN 1: +/- 0.2 mm COLUMN 2: +/- 1 year COLUMN 3: +/- 0.3 permil (analytical); COLUMN 4 (reproducibility) COLUMN 4: reproducibility (1-sigma) based on 2-4 replicates FILE2: lidat.dat VARIABLE NAMES: COLUMN 1: depth (mm) COLUMN 2: year COLUMN 3: o18 VARIABLE UNITS: COLUMN 1: depth (mm), with 0 arbitrarily set to most recent tree growth COLUMN 2: years, based on age model described in Evans and Schrag (2004) COLUMN 3: per mil, relative to the SMOW standard DATA PRECISION (1 STANDARD DEVIATION): COLUMN 1: +/- 0.2 mm COLUMN 2: +/- 5 years COLUMN 3: +/- 0.3 permil (analytical) FILE3: lsdat.dat VARIABLE NAMES: COLUMN 1: depth (mm) COLUMN 2: year COLUMN 3: o18 VARIABLE UNITS: COLUMN 1: depth (mm), with 0 arbitrarily set to most recent tree growth COLUMN 2: years, based on age model described in Evans and Schrag (2004) COLUMN 3: per mil, relative to the SMOW standard DATA PRECISION (1 STANDARD DEVIATION): COLUMN 1: +/- 0.2 mm COLUMN 2: +/- 2 years COLUMN 3: +/- 0.3 permil (analytical) FILE4: ppdat.dat VARIABLE NAMES: COLUMN 1: depth (mm) COLUMN 2: o18 VARIABLE UNITS: COLUMN 1: depth (mm), with 0 arbitrarily set to most recent tree growth COLUMN 2: per mil, relative to the SMOW standard DATA PRECISION (1 STANDARD DEVIATION): COLUMN 1: +/- 0.2 mm COLUMN 2: +/- 0.3 permil (analytical) DATA FORMAT: ASCII text tab-delimited files. ADDITIONAL INFORMATION: Please see Evans and Schrag (2004), Geochim et Cosmochim Acta, 1998 68(16), 3295-3305, DOI: 10.1016/j.gca.2004.01.006 for more information.