# Pacific Ocean TEX86 and Mg/Ca SST Reconstructions during the Holocene and Last Glacial Maximum #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # 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/30152 # Online_Resource_Description: NOAA Landing Page # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/27330 # Online_Resource_Description: NOAA Landing Page for Temperature-12k Database # # Online_Resource: https://www.ncei.noaa.gov/pub/data/paleo/reconstructions/climate12k/temperature/version1.0.0/Temp12k_directory_NOAA_files/MV101417JC.Hertzberg.2016.txt # Online_Resource_Description: NOAA location of the template # # Original_Source_URL: # Description/Documentation lines begin with # # Data lines have no # # # Data_Type: Climate Reconstructions # Parameter_Keywords: sea surface temperature # Dataset_DOI: # #------------------ # Contribution_Date # Date: 2020-04-15 #------------------ # File_Last_Modified_Date # Date: 2020-05-18 #------------------ # Title # Study_Name: Pacific Ocean TEX86 and Mg/Ca SST Reconstructions during the Holocene and Last Glacial Maximum #------------------ # Investigators # Investigators: Hertzberg, Jennifer E.; Schmidt, Matthew W.; Bianchi, Thomas S.; Smith, Richard W.; Shields, Michael R.; Marcantonio, Franco #------------------ # Description_Notes_and_Keywords # Description: Metadata are from the Temperature-12k project (https://doi.org/10.25921/4RY2-G808). Data are from the supplemental material of Hertzberg et al. 2016 (https://doi.org/10.1016/j.epsl.2015.11.050). #------------------ # Publication # Authors: Hertzberg, Jennifer E.; Schmidt, Matthew W.; Bianchi, Thomas S.; Smith, Richard W.; Shields, Michael R.; Marcantonio, Franco # Published_Date_or_Year: 2016 # Published_Title: Comparison of eastern tropical Pacific TEX86 and Globigerinoides ruber Mg/Ca derived sea surface temperatures: Insights from the Holocene and Last Glacial Maximum # Journal_Name: Earth and Planetary Science Letters # Volume: 434 # Edition: # Issue: # Pages: 320-332 # Report: # DOI: 10.1016/j.epsl.2015.11.050 # Online_Resource: # Full_Citation: Hertzberg, J.E.; Schmidt, M.W.; Bianchi, T.S.; Smith, R.W.; Shields, M.R.; Marcantonio, F. (2016): Comparison of eastern tropical Pacific TEX86 and Globigerinoides ruber Mg/Ca derived sea surface temperatures: Insights from the Holocene and Last Glacial Maximum. Earth and Planetary Science Letters, 434, 320--332, doi:10.1016/j.epsl.2015.11.050 # Abstract: The use of the TEX86 temperature proxy has thus far come to differing results as to whether TEX86 temperatures are representative of surface or subsurface conditions. In addition, although TEX86 temperatures might reflect sea surface temperatures based on core-top (Holocene) values, this relationship might not hold further back in time. Here, we investigate the TEX86 temperature proxy by comparing TEX86 temperatures to Mg/Ca temperatures of multiple species of planktonic foraminifera for two sites in the eastern tropical Pacific (on the Cocos and Carnegie Ridges) across the Holocene and Last Glacial Maximum. Core-top and Holocene TEXH86 temperatures at both study regions agree well, within error, with the Mg/Ca temperatures of Globigerinoides ruber, a surface dwelling planktonic foraminifera. However, during the Last Glacial Maximum, TEXH86 temperatures are more representative of upper thermocline temperatures, and are offset from G. ruber Mg/Ca temperatures by 5.8◦C and 2.9◦C on the Cocos Ridge and Carnegie Ridge, respectively. This offset between proxies cannot be reconciled by using different TEX86 temperature calibrations, and instead, we suggest that the offset is due to a deeper export depth of GDGTs at the LGM. We also compare the degree of glacial cooling at bothsites based on both temperature proxies, and find that TEXH86 temperatures greatly overestimate glacial cooling, especially on the Cocos Ridge. This study has important implications for applying the TEX86 paleothermometer in the eastern tropical Pacific. #------------------ # Publication # Authors: Kaufman, D., N. McKay, C. Routson, M. Erb, B. Davis, O. Heiri, S. Jaccard, J. Tierney, C. Dätwyler, Y. Axford, T. Brussel, O. Cartapanis, B. Chase, A. Dawson, A. de Vernal, S. Engels, L. Jonkers, J. Marsicek, P. Moffa-Sánchez, C. Morrill, A. Orsi, K. Rehfeld, K. Saunders, P. S. Sommer, E. Thomas, M. Tonello, M. Tóth, R. Vachula, A. Andreev, S. Bertrand, B. Biskaborn, M. Bringué, S. Brooks, M. Caniupán, M. Chevalier, L. Cwynar, J. Emile-Geay, J. Fegyveresi, A. Feurdean, W. Finsinger, M-C. Fortin, L. Foster, M. Fox, K. Gajewski, M. Grosjean, S. Hausmann, M. Heinrichs, N. Holmes, B. Ilyashuk, E. Ilyashuk, S. Juggins, D. Khider, K. Koinig, P. Langdon, I. Larocque-Tobler, J. Li, A. Lotter, T. Luoto, A. Mackay, E. Magyari, S. Malevich, B. Mark, J. Massaferro, V. Montade, L. Nazarova, E. Novenko, P. Paril, E. Pearson, M. Peros, R. Pienitz, M. Plóciennik, D. Porinchu, A. Potito, A. Rees, S. Reinemann, S. Roberts, N. Rolland, S. Salonen, A. Self, H. Seppä, S. Shala, J-M. St-Jacques, B. Stenni, L. Syrykh, P. Tarrats, K. Taylor, V. van den Bos, G. Velle, E. Wahl, I. Walker, J. Wilmshurst, E. Zhang, S. Zhilich # Published_Date_or_Year: 2020-04-14 # Published_Title: A global database of Holocene paleotemperature records # Journal_Name: Scientific Data # Volume: 7 # Edition: 115 # Issue: # Pages: # Report_Number: # DOI: 10.1038/s41597-020-0445-3 # Online_Resource: https://www.nature.com/articles/s41597-020-0445-3 # Full_Citation: # Abstract: A comprehensive database of paleoclimate records is needed to place recent warming into the longer-term context of natural climate variability. We present a global compilation of quality-controlled, published, temperature-sensitive proxy records extending back 12,000 years through the Holocene. Data were compiled from 679 sites where time series cover at least 4000 years, are resolved at sub-millennial scale (median spacing of 400 years or finer) and have at least one age control point every 3000 years, with cut-off values slackened in data-sparse regions. The data derive from lake sediment (51%), marine sediment (31%), peat (11%), glacier ice (3%), and other natural archives. The database contains 1319 records, including 157 from the Southern Hemisphere. The multi-proxy database comprises paleotemperature time series based on ecological assemblages, as well as biophysical and geochemical indicators that reflect mean annual or seasonal temperatures, as encoded in the database. This database can be used to reconstruct the spatiotemporal evolution of Holocene temperature at global to regional scales, and is publicly available in Linked Paleo Data (LiPD) format. #------------------ # Funding_Agency # Funding_Agency_Name: # Grant: #------------------ # Site_Information # Site_Name: MV1014-02-17JC # Location: Pacific Ocean>Eastern Pacific Ocean # Country: # Northernmost_Latitude: -0.180533 # Southernmost_Latitude: -0.180533 # Easternmost_Longitude: -85.86673 # Westernmost_Longitude: -85.86673 # Elevation: -2867 #------------------ # Data_Collection # Collection_Name: MV101417JC.Hertzberg.2016 # Earliest_Year: 24734 # Most_Recent_Year: 20369 # Time_Unit: cal yr BP # Core_Length: # Notes: #------------------ # Species # Species_Name: # Species_Code: # Common_Name: #------------------ # Chronology_Information # Chronology: # labcode depth_cm mat_dated c14_date c14_1s_err cal_date cal- cal+ # OS-98923 220.0 Neogloboquadrina dutertrei 14350 60 16900 290 230 # OS-117129 356.5 Neogloboquadrina dutertrei 23800 180 27600 270 260 #------------------ # Variables # # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # ##depth depth,,,centimeter,,paleoceanography;climate reconstructions,,,N, ##age age,,,calendar kiloyear before present,,paleoceanography;climate reconstructions,,,N, ##gdgt_ratio organic compound index,,,dimensionless,,paleoceanography,,,N,ratio of GDGT-2/GDGT-3 ##MI organic compound index,,,dimensionless,,paleoceanography,,,N,methane index calculated from GDGTs ##gdgt0 glycerol dialkyl glycerol tetraether,,,percent,,paleoceanography,,,N,percent of GDGT-0 ##tex86 tetraether index of 86 carbon atoms,,,dimensionless,,paleoceanography,,,N,TEX86 index of Schouten et al. 2002 ##tex86H tetraether index of 86 carbon atoms,,,dimensionless,,paleoceanography,,,N,TEX86H index of Kim et al. 2010 ##temp_tex86H temperature,sea water;glycerol dialkyl glycerol tetraether index,,degree Celsius,,paleoceanography;climate reconstructions,,,N,based on TEX86H index ##tex86L tetraether index of 86 carbon atoms,,,dimensionless,,paleoceanography,,,N,TEX86L index of Kim et al. 2010 ##temp_tex86L temperature,sea water;glycerol dialkyl glycerol tetraether index,,degree Celsius,,paleoceanography;climate reconstructions,,,N,based on TEX86L index ##temp_diff temperature,sea water;glycerol dialkyl glycerol tetraether index,,degree Celsius,,paleoceanography;climate reconstructions,differenced,,N,TEX86H minus TEX86L temperature ##mgca_rub magnesium/calcium,Globigerinoides ruber,,millimole per mole,,paleoceanography,,,N, ##temp_rub sea surface temperature,magnesium/calcium,,degree Celsius,,paleoceanography;climate reconstructions,,,N,based on G. ruber ##mgca_men magnesium/calcium,Globorotalia menardii,,millimole per mole,,paleoceanography,,,N, ##temp_men sea surface temperature,magnesium/calcium,,degree Celsius,,paleoceanography;climate reconstructions,,,N,based on G. menardii ##mgca_dut magnesium/calcium,Neogloboquadrina dutertrei,,millimole per mole,,paleoceanography,,,N, ##temp_dut sea surface temperature,magnesium/calcium,,degree Celsius,,paleoceanography;climate reconstructions,,,N,based on N. dutertrei # #------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: nan # depth age gdgt_ratio MI gdgt0 tex86 tex86H temp_texH tex86L temp_texL temp_diff mgca_rub temp_rub mgca_men temp_men mgca_dut temp_dut 264.5 20.369 6.32 0.281 nan 0.5495 -0.2600 20.81 -0.3842 20.97 -0.15 2.40 23.81 1.35 17.09 nan nan 280.5 21.609 6.76 0.316 nan 0.5354 -0.2714 20.04 -0.3880 20.71 -0.67 2.28 23.27 1.14 15.27 nan nan 295 22.782 7.18 0.277 44.9 0.5557 -0.2552 21.15 -0.3650 22.26 -1.12 2.25 23.13 1.45 17.91 0.72 15.72 308.5 23.838 7.08 0.304 nan 0.5471 -0.2619 20.69 -0.3774 21.43 -0.74 2.37 23.68 1.30 16.73 nan nan 320 24.734 7.88 0.237 45.1 0.5420 -0.2660 20.41 -0.3804 21.22 -0.82 2.31 23.40 1.21 15.90 0.77 16.59