# Lake Titicaca 60 kyr Leaf Wax Hydrogen Isotope Data #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # 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: http://ncdc.noaa.gov/paleo/study/17419 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/titicaca2014dd-ne98-4bxb.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleolimnology #-------------------- # Contribution_Date # Date: 2014-11-10 #-------------------- # Title # Study_Name: Lake Titicaca 60 kyr Leaf Wax Hydrogen Isotope Data #-------------------- # Investigators # Investigators: Fornace, K.L.; Hughen, K.A.; Shanahan, T.M.; Fritz, S.C.; Baker, P.A.; Sylva, S.P. #-------------------- # Description_and_Notes # Description: Hydrogen isotope data for C28 and C30 n-alkanoic acids in Lake Titicaca sediments. # Sediments were taken from NE98-4BXB (3.5-0 ka) and LT01-2B (60-3.5 ka) cores (in separate data files). # For details on chronology, see Fritz et al. 2007 Lake Titicaca data set: # ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/titicaca2007.txt # Note for this dD data set calendar ages in original age model were updated using IntCal13 calibration. #-------------------- # Publication # Authors: Kyrstin L. Fornace, Konrad A. Hughen, Timothy M. Shanahan, Sherilyn C. Fritz, Paul A. Baker, Sean P. Sylva # Published_Date_or_Year: 2014-12-15 # Published_Title: A 60,000-year record of hydrologic variability in the Central Andes from the hydrogen isotopic composition of leaf waxes in Lake Titicaca sediments # Journal_Name: Earth and Planetary Science Letters # Volume: 408 # Edition: # Issue: # Pages: 263-271 # DOI: 10.1016/j.epsl.2014.10.024 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S0012821X14006451 # Full_Citation: # Abstract: A record of the hydrogen isotopic composition of terrestrial leaf waxes (dDwax) in sediment cores from Lake Titicaca provides new insight into the precipitation history of the Central Andes and controls of South American Summer Monsoon (SASM) variability since the last glacial period. Comparison of the dDwax record with a 19-kyr dD record from the nearby Illimani ice core supports the interpretation that precipitation dD is the primary control on dDwax with a lesser but significant role for local evapotranspiration and other secondary influences on dDwax. The Titicaca dDwax record confirms overall wetter conditions in the Central Andes during the last glacial period relative to a drier Holocene. During the last deglaciation, abrupt dDwax shifts correspond to millennial-scale events observed in the high-latitude North Atlantic, with dry conditions corresponding to the Bolling-Allerød and early Holocene periods and wetter conditions during late glacial and Younger Dryas intervals. We observe a trend of increasing monsoonal precipitation from the early to the late Holocene, consistent with summer insolation forcing of the SASM, but similar hydrologic variability on precessional timescales is not apparent during the last glacial period. Overall, this study demonstrates the relative importance of high-latitude versus tropical forcing as a dominant control on glacial SASM precipitation variability. #------------------ # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: DEB-0447281, ATM-0502517, EAR-1338694 #------------------ # Site_Information # Site_Name: Lake Titicaca Core NE98-4BXB # Location: South America>Bolivia # Country: Bolivia # Northernmost_Latitude: -16.14 # Southernmost_Latitude: -16.14 # Easternmost_Longitude: -69.15 # Westernmost_Longitude: -69.15 # Elevation: 3810 m #------------------ # Data_Collection # Collection_Name: Titicaca2014dD-NE98-4BXB # Earliest_Year: 3681 # Most_Recent_Year: 284 # Time_Unit: Cal. Year BP # Core_Length: m # Notes: #------------------ # Chronology: # # For details on chronology, # see Fritz et al. 2007 Lake Titicaca data set: # ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/titicaca2007.txt # Note for this dD data set calendar ages in original age model were updated using IntCal13 calibration. # # #---------------- # Variables # # Data variables follow that 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) # ##sample_code sample code, , , , , , core-depth for NE98-4BXB samples or core-section-section depth for LT01-2B samples, ,C ##depth_cm depth, , , cm, , , corrected total depth, ,N ##age_calBP age, , , calendar years before present, , , , ,N ##nC28_dD dD ,n-C28 alkanoic acid, ,per mil VSMOW, ,sediment, ,GC-IRMS,N ##nC28_err dD ,n-C28 alkanoic acid,1 sigma precision,per mil VSMOW, ,sediment, ,GC-IRMS,N ##nC28_rep number of analyses,n-C28 alkanoic acid, ,number of analyses, ,sediment, ,GC-IRMS,N ##nC30_dD dD ,n-C30 alkanoic acid, ,per mil VSMOW, ,sediment, ,GC-IRMS,N ##nC30_err dD ,n-C30 alkanoic acid,1 sigma precision,per mil VSMOW, ,sediment, ,GC-IRMS,N ##nC30_rep number of analyses,n-C30 alkanoic acid, ,number of analyses, ,sediment, ,GC-IRMS,N # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: N/A # sample_code depth_cm age_calBP nC28_dD nC28_err nC28_rep nC30_dD nC30_err nC30_rep NE98-4BXB-4 6.9 284 -171.3 N/A 1 -180.9 N/A 1 NE98-4BXB-17 25.5 1102 -172.7 5.4 6 -183.4 6.6 3 NE98-4BXB-22.5 32.4 1406 -183.8 7.5 3 -208.8 4.0 2 NE98-4BXB-27 38.6 1678 -169.1 3.1 2 -189.0 0.0 2 NE98-4BXB-29.5 42.1 1832 N/A N/A 0 -173.0 0.7 2 NE98-4BXB-32.5 46.2 2013 -155.5 1.7 4 -167.1 5.3 2 NE98-4BXB-39.5 55.9 2437 -143.6 0.2 2 -148.3 2.0 2 NE98-4BXB-43 60.7 2651 -156.1 2.8 4 -175.0 3.7 4 NE98-4BXB-50 71.0 3105 -171.8 0.1 2 N/A N/A 0 NE98-4BXB-56 79.3 3469 N/A N/A 0 -199.1 0.7 2 NE98-4BXB-60 84.1 3681 -176.0 1.9 2 -193.8 0.4 2