Amazon Basin Pleistocene Precipitation Reconstruction Data: 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: Amazon Basin Pleistocene Precipitation Reconstruction Data LAST UPDATE: 7/1999 (Original Receipt by WDCA Paleo) CONTRIBUTOR: Sara Harris, Sea Education Association IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 1999-039 SUGGESTED DATA CITATION: Harris, S.E., 1999, Amazon Basin Pleistocene Precipitation Reconstruction Data, IGBP PAGES/ World Data Center A-Paleoclimatology Data Contribution Series #1999-039. NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCES: Harris, S.E. and A.C. Mix, 1999. Pleistocene precipitation balance in the Amazon Basin recorded in deep sea sediments. Quaternary Research 51, 14-26. Bickert, T., Curry, W.B., and Wefer, G., 1997. Late Pliocene to Holocene (2.6 to 0 Ma) western equatorial Atlantic deep water circulation: inferences from benthic stable isotopes, Leg 154. In: Shackleton, N.J., Curry, W.B., Richter, C., and Bralower, T.J. (Eds.). Proc. ODP Sci. Results, 154: College Station, TX (Ocean Drilling Program), 239-253. Laskar, J., Joutel, F., and Boudin, F., 1993. Orbital, precessional and insolation quantities for the Earth from -20Myr to +10Myr. Astronomy and Astrophysics, 270, 522-533. Shackleton, N.J., and Crowhurst, S., 1997. Sediment fluxes based on an orbitally tuned time scale 5 Ma to 14 Ma, Site 926. In: Shackleton, N.J., Curry, W.B., Richter, C., and Bralower, T.J. (Eds.). Proc. ODP Sci. Results, 154: College Station, TX (Ocean Drilling Program), 69-77. Tiedemann, R., and Franz, S.O., 1997. Deep-water circulation, chemistry and terrigenous sediment supply in the equatorial Atlantic during the Pliocene, 3.3-2.6 Ma and 5-4.5 Ma. In: Shackleton, N.J., Curry, W.B., Richter, C., and Bralower, T.J. (Eds.). Proc. ODP Sci. Results, 154: College Station, TX (Ocean Drilling Program), 299-318. GEOGRAPHIC REGION: Western Tropical Atlantic PERIOD OF RECORD: Pleistocene LIST OF FILES: Readme.Harris1999.txt (this file), 925.MS.bands.splice, 926.MS.bands.splice, rmode.3fact.txt, scores925.dat, scores926.dat, goeth925_cfree.txt, goeth926_cfree.txt, hem925_cfree.txt, hem926_cfree.txt, gh925.txt, gh926.txt, estcarb926.txt, Q65N.La90.1_1.jun.txt. DESCRIPTION: Files 925.MS.bands.splice and 926.MS.bands.splice: Magnetic susceptibility, % reflectance, and first derivatives of %reflectance for Ocean Drilling Program Sites 925-926 following the shipboard splice. Columns 1-5: Standard Ocean Drilling Program ID string Column 6: mbsf depth Column 7: mcd depth for reflectance data Column 8: Corresponding mcd depth for matching magnetic susceptibility data. In most cases, this depth is equivalent to column 7. Column 9: Magnetic susceptibility value Column 10: "0"s Ignore this column. Columns 11-80: 70 % reflectance bands. Each column represents the average % reflectance in 10-nm-wide bands centered on wavelengths from 255 nm to 945 nm (255, 265, 275, ..., 945). Columns 81-148: 68 first derivative bands calculated from Columns 11-80 using the centered difference method. Center wavelengths are 265 nm to 935 nm (265, 275, 285,..., 935). File rmode.3fact.txt: This file contains the R-mode 3 factor model for estimating hematite and goethite from reflectance Column 1: Wavelength number (1-31), 1 = 405 nm, 2 = 415 nm etc. Column 2: Communality for each wavelength from the 3 factor model Column 3: Factor 1 loadings Column 4: Factor 2 loadings Column 5: Factor 3 loadings Column 6: Wavelength (nm) Files scores925.dat and scores926.dat: Factor scores for reflectance data from Sites 925 and 926 using the 3-factor model in rmode.3fact.txt. Note that only the visible part of the spectrum (405-695 nm) is used. Column 1: mcd depth Column 2: Factor 1 scores Column 3: Factor 2 scores Column 4: Factor 3 scores File goeth925_cfree.txt: Estimated % goethite (carbonate-free) from Site 925. The first 67 lines of this file were spliced to the 926 record. Column 1: Depth in meters composite depth (mcd) Column 2: Age (Ma) from the tuned age model of Bickert et al. (1997), Tiedemann and Franz (1997), and Shackleton and Crowhurst (1997). Column 3: % Goethite (carbonate-free) estimated from reflectance data File goeth926_cfree.txt: Estimated % goethite (carbonate-free) from Site 926. The first 49 lines of this file were skipped - see goeth925_cfree.txt. Column 1: Depth in meters composite depth (mcd) Column 2: Age (Ma) from the tuned age model of Bickert et al. (1997), Tiedemann and Franz (1997), and Shackleton and Crowhurst (1997). Column 3: % Goethite (carbonate-free) estimated from reflectance data File hem925_cfree.txt: Estimated % hematite (carbonate-free) from Site 925. The first 67 lines of this file were spliced to the 926 record. Column 1: Depth in meters composite depth (mcd) Column 2: Age (Ma) from the tuned age model of Bickert et al. (1997), Tiedemann and Franz (1997), and Shackleton and Crowhurst (1997). Column 3: % Hematite (carbonate-free) estimated from reflectance data File hem926_cfree.txt: Estimated % hematite (carbonate-free) from Site 926. The first 49 lines of this file were skipped - see hem925_cfree.txt. Column 1: Depth in meters composite depth (mcd) Column 2: Age (Ma) from the tuned age model of Bickert et al. (1997), Tiedemann and Franz (1997), and Shackleton and Crowhurst (1997). Column 3: % Hematite (carbonate-free) estimated from reflectance data File gh925.txt: Goethite/Goethite+Hematite (G/G+H) from Site 925. The first 65 lines of this file were spliced to the 926 record. Column 1: Depth in meters composite depth (mcd) Column 2: Age (Ma) from the tuned age model of Bickert et al. (1997), Tiedemann and Franz (1997), and Shackleton and Crowhurst (1997). Column 3: G/G+H estimated from reflectance data File gh926.txt: Goethite/Goethite+Hematite (G/G+H) from Site 926. The first 47 lines of this file were skipped - see gh925.txt. Column 1: Depth in meters composite depth (mcd) Column 2: Age (Ma) from the tuned age model of Bickert et al. (1997), Tiedemann and Franz (1997), and Shackleton and Crowhurst (1997). Column 3: G/G+H estimated from reflectance data File estcarb926.txt: This file contains estimated %CaCO3 (estimated from reflectance and magnetic susceptibility) for Site 926. Column 1: Age (Ma) from the tuned age model of Bickert et al. (1997), Tiedemann and Franz (1997), and Shackleton and Crowhurst (1997). Column 2: Estimated %CaCO3 File Q65N.La90.1_1.jun.txt: Solar insolation for June at 65 degrees North from the Laskar 90 (1,1) orbital solution (Laskar et al., 1993) Column 1: Age (negative ka) Column 2: Insolation at 65 N (W/m2)