Leavitt et al. 2007 Southwestern U.S. Drought Maps From Pinyon Tree-Ring Carbon Isotopes Leavitt, S.W.; Chase, T.N.; Rajagopalan, B.; Lee, E.; Lawrence, P.J.; Woodhouse, C.A. Leavitt, S.W. Chase, T.N. Rajagopalan, B. Lee, E. Lawrence, P.J. Woodhouse, C.A. Other Hydroclimate Reconstruction drought 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 (moisture index,null,null,dimensionless,null,climate reconstructions|tree ring,null,null,N,Single-year drought indices are derived from a straight-line fit to the 1985-1999 d13C values) earth science/paleoclimate/climate reconstructions|tree ring (moisture index,null,null,dimensionless,null,climate reconstructions|tree ring,null,null,N,"1600-04 to 1975-79 isotope drought indices are all from the spline curves with stiffness=50 from the Leavitt & Long (1989) paper. 1980-84 isotope drought index is from spline fit to full chronology of d13C at each site, using average annual d13C values from 1985-89 to produce mean pentad drought indexes for 1985-89, 1990-94 and 1995. 1985-89, 1990-94 and 1995-99 isotope drought indices are also from the same spline fit using the average of 5 single-year d13C values as the pentad values.") earth science/paleoclimate/tree ring (delta 13C,null,null,per mil PDB,null,tree ring,averaged,null,N,pentad averages) earth science/paleoclimate/climate reconstructions|tree ring (moisture index,null,null,dimensionless,null,climate reconstructions|tree ring,null,null,N,"1600-04 to 1975-79 isotope drought indices are all from the spline curves with stiffness=50 from the Leavitt & Long (1989) paper. 1980-84 isotope drought index is from spline fit to full chronology of d13C at each site, using average annual d13C values from 1985-89 to produce mean pentad drought indexes for 1985-89, 1990-94 and 1995. 1985-89, 1990-94 and 1995-99 isotope drought indices are the average of 5 single-year d13C values--- NOT a result of a spline fit to pentads.") earth science/paleoclimate/climate reconstructions|tree ring (age at sample start,null,null,year Common Era,null,climate reconstructions|tree ring,null,null,N,null) earth science/paleoclimate/tree ring (age at sample start,null,null,year Common Era,null,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 (Southwestern United States>LATITUDE >LONGITUDE ) Records of past temperature, precipitation, and other climate variables derived from paleoclimate proxies. Parameter keywords describe what was measured in this data set. Additional summary information can be found in the abstracts of papers listed in the data set citations. STUDY NOTES: This study utilizes 14 pinyon pine sites collected across 6 states in the American Southwest to develop Drought Indices using d13C analysis. IITRDB4 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Leavitt, S.W. Investigator : Chase, T.N. Investigator : Rajagopalan, B. Investigator : Lee, E. Investigator : Lawrence, P.J. Investigator : Woodhouse, C.A. 2007-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/5696 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/leavitt2007/ https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/leavitt2007/ English https://www.ncdc.noaa.gov/paleo/study/5696 https://www1.ncdc.noaa.gov/pub/data/paleo/treering/isotope/northamerica/usa/leavitt2007/ START YEAR: 1600 AD * END YEAR: 1999 AD -121 31 -101 42