# Guaymas Basin 9-12kYrBP Leaf Wax Isotopes and Precipitation Reconstructions #----------------------------------------------------------------------- # 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/24890 # Description: # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/bhattacharya2018/bhattacharya2018nh-8p.txt # Description: # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleoceanography # # Dataset_DOI: # # Parameter_Keywords: biomarkers, carbon isotopes #-------------------- # Contribution_Date # Date: 2018-09-03 #-------------------- # File_Last_Modified_Date # Date: 2018-09-03 #-------------------- # Title # Study_Name: Guaymas Basin 9-12kYrBP Leaf Wax Isotopes and Precipitation Reconstructions #-------------------- # Investigators # Investigators: Bhattacharya, T.; Tierney, J.E.; Addison, J.A.; Murray, J.W. #-------------------- # Description_Notes_and_Keywords # Description: Stable isotope (dD and d13C) data on leaf waxes, plus summer (July-September) monsoon precipitation reconstructions from 4 sediment cores collected in the Guaymas Basin, Gulf of California, for the interval 9-12 kYrBP. #-------------------- # Publication # Authors: Tripti Bhattacharya, Jessica E. Tierney, Jason A. Addison, James W. Murray # Published_Date_or_Year: 2018-09-03 # Published_Title: Ice sheet modulation of deglacial North American Monsoon intensification # Journal_Name: Nature Geoscience # Volume: # Edition: # Issue: # Pages: # Report_Number: # DOI: 10.1038/s41561-018-0220-7 # Online_Resource: https://www.nature.com/articles/s41561-018-0220-7 # Full_Citation: # Abstract: The North American monsoon, the dominant source of rainfall for much of the arid US Southwest, remains one of the least understood monsoon systems. The late Pleistocene evolution of this monsoon is poorly constrained, largely because glacial changes in winter rainfall obscure summer monsoon signatures in many regional proxy records. Here, we develop deglacial records of monsoon strength from isotopic analyses of leaf wax biomarkers in marine sediment cores. Reconstructions indicate a regional decrease in monsoon rainfall during the Last Glacial Maximum, and that the deglacial trajectory of the North American monsoon closely tracks changes in North American ice cover. In climate model simulations, North American ice cover shifts the westerlies southwards, favouring the mixing of cold, dry air into the US Southwest. This process, known as ventilation, weakens the monsoon by diluting the energy fluxes required for convection. As the ice sheet retreats northwards, the monsoon strengthens, and local ocean conditions may play a larger role in regulating its intensity. We conclude that on glacial-interglacial timescales, ice-sheet-induced reorganizations of atmospheric circulation have a dominant influence on the North American monsoon. #------------------ # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: OCE-1651034 #------------------ # Funding_Agency_Name: David and Lucile Packard Foundation # Grant: #------------------ # Site_Information # Site_Name: NH-8P # Location: Ocean>Pacific Ocean>Eastern Pacific Ocean # Country: Mexico # Northernmost_Latitude: 22.23 # Southernmost_Latitude: 22.23 # Easternmost_Longitude: -107.05 # Westernmost_Longitude: -107.05 # Elevation: -1018 m #------------------ # Data_Collection # Collection_Name: Bhattacharya2018NH-8P # Earliest_Year: 24266 # Most_Recent_Year: 1460 # Time_Unit: Cal. Years BP # Core_Length: 3.55 # Notes: #------------------ # Chronology_Information # See Ganeshram, R.S. and Pedersen, T.F., 1998. Glacial‐interglacial variability in upwelling and bioproductivity off NW Mexico: Implications for quaternary paleoclimate. Paleoceanography, 13(6), pp.634-645., doc: 10.1029/98PA02508 #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: one per line, shortname-tab-variable components (what, material, error, units, seasonality, data type,detail, method, C or N for Character or Numeric data, additional information) # ## depth_cm depth, , , cm, , , , ,N, ## age_calBP age, , , calendar years before present, , , , ,N, ## dDwax delta D, C-30 fatty acid,,per mil VSMOW,,Paleoceanography,,compound-specific isotope ratio mass spectrometry,N, ## dDwax-iv delta D, C-30 fatty acid,,per mil VSMOW,,Paleoceanography,corrected,compound-specific isotope ratio mass spectrometry,N, corrected for ice volume ## d13Cwax delta 13C, C-30 fatty acid,,per mil VSMOW,,Paleoceanography,,compound-specific isotope ratio mass spectrometry,N, ## percentJAS precipitation,,,percent,July-September, Climate Reconstruction,,Bayesian inference,N, Mean percent July-September rainfall ## JASerror precipitation error,,,percent,July-September, Climate Reconstruction,,Bayesian inference,N, error for Mean percent July-September rainfall # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: (Value used to flag missing data in the table below) # depth_cm age_calBP dDwax dDwax-iv d13Cwax percentJAS JASerror 9 1460 -150.69 -150.6 -24.532 78.251 7.9638 12 1653.9 -155.66 -155.53 -24.527 69.339 7.9613 18 2060.4 -154.15 -153.99 -25.992 68.373 7.9654 21 2252.1 -158.26 -158.18 -24.422 64.345 8.0093 26 2561.1 -156.83 -156.87 -25.099 65.198 7.9903 30 2775.5 -156.43 -156.56 -25.225 65.555 8.0625 36 3218.1 -159.52 -159.75 -24.855 59.949 8.096 40 3582 -164.17 -164.42 -24.454 52.341 8.3303 45 4017.8 -159.77 -160.03 -25.338 58.845 8.0172 48 4270.2 -165.75 -165.97 -24.332 49.703 8.3837 51 4547.2 -158.21 -158.39 -24.911 62.966 8.2853 57 5113.7 -160.8 -160.94 -24.612 58.583 8.246 60 5382.2 -163.32 -163.54 -24.585 54.232 8.2467 65 5844.2 -158.27 -158.61 -24.159 63.349 8.0702 70 6289.8 -158.07 -158.49 -24.307 63.478 8.0568 77 6865.5 -156.33 -156.84 -24.53 66.468 7.8445 81 7307.9 -152.41 -153 -25.109 72.851 7.9603 84 7670.5 -154.43 -155.09 -23.982 71.043 7.9843 86 7926.3 -163.31 -164.01 -24.077 53.9 8.2753 90 8409.1 -161.53 -162.18 -25.252 54.845 8.2703 96 9107.3 -153.88 -154.51 -24.876 70.256 8.0619 98 9353.9 -155.88 -156.63 -24.64 66.734 8.0356 101 9642.9 -156.01 -156.92 -26.299 62.589 8.1142 104 9979.4 -155.18 -156.26 -25.861 64.601 8.1635 108 10436 -153.64 -154.87 -24.279 70.619 7.9833 111 10786 -160.53 -161.86 -24.218 57.174 8.1171 114 11135 -153.95 -155.52 -25.97 65.722 7.8984 117 11490 -152.91 -154.91 -25.022 69.565 7.8422 120 11854 -155.32 -157.75 -24.554 64.767 7.9747 122 12081 -158.5 -161.14 -24.53 58.257 8.1967 124 12319 -150.99 -153.77 -24.648 72.263 7.8873 127 12661 -156.49 -159.43 -25.583 59.373 8.1516 129 12901 -159.09 -162.15 -26.002 53.35 8.2457 131 13156 -156.78 -160.03 -24.219 61.683 8.1097 134 13509 -154.37 -157.92 -24.572 64.328 8.0533 136 13758 -155.1 -158.85 -25.683 60.103 8.1213 140 14189 -156.62 -160.72 -27.156 52.207 8.2755 143 14473 -151.68 -156.02 -24.326 68.505 7.927 146 14663 -156.35 -160.83 -24.864 58.057 8.2033 150 14883 -159.45 -164.08 -24.948 52.474 8.4946 153 15036 -154.17 -158.95 -25.601 60.519 8.1296 158 15285 -158.33 -163.33 -24.563 54.397 8.4498 163 15535 -157.43 -162.68 -24.642 55.873 8.1707 168 15779 -157.9 -163.39 -24.947 53.36 8.2925 173 16000 -155.14 -160.85 -24.143 59.546 8.0981 178 16205 -159.27 -165.05 -24.02 52.453 8.3076 184 16453 -156.41 -162.33 -24.639 56.468 8.3409 189 16660 -155.06 -161.1 -25.294 56.921 8.1037 195 16909 -155.34 -161.49 -25.622 55.813 8.2252 201 17160 -155.99 -162.27 -25.046 55.756 8.4009 206 17378 -158.73 -165.1 -24.493 51.027 8.354 211 17593 -158.8 -165.28 -24.423 50.976 8.3826 217 17869 -164.03 -170.62 -25.324 38.921 9.2968 222 18090 -160.7 -167.36 -25.642 44.012 8.8978 227 18316 -157.6 -164.23 -24.381 52.728 8.1961 232 18543 -157.94 -164.52 -26.082 48.86 8.4201 238 18822 -154.48 -161.02 -24.653 58.794 8.1037 243 19054 -164.91 -171.34 -24.283 40.036 9.0519 249 19330 -158.77 -165.27 -24.412 50.806 8.4515 254 19563 -163.21 -169.71 -24.294 43.148 8.8801 259 19787 -157.08 -163.65 -25.032 53.195 8.1933 265 20065 -162.08 -168.61 -25.444 42.914 8.8895 270 20298 -157.2 -163.7 -23.674 55.564 8.3266 275 20532 -162.88 -169.27 -24.631 42.976 8.9516 280 20768 -164.96 -171.26 -25.674 37.078 9.029 286 21048 -166.47 -172.69 -24.459 37.158 9.1044 291 21282 -161.74 -167.97 -24.883 45.153 8.7442 296 21519 -161.66 -167.87 -24.968 44.848 8.6909 300 21707 -161.31 -167.49 -24.723 46.286 8.383 302 21805 -165.67 -171.81 -24.166 39.036 8.9805 307 22032 -169.81 -175.9 -24.92 30.696 9.6462 312 22267 -163.68 -169.8 -24.911 41.757 8.9399 317 22504 -163.08 -169.18 -26.116 40.228 8.7943 323 22775 -167.03 -173.08 -25.058 35.429 9.2692 328 23012 -162.81 -168.87 -25.171 43.296 9.0326 334 23285 -162.17 -168.2 -25.107 43.932 8.6614 339 23521 -166.87 -172.81 -23.98 37.641 9.2014 344 23752 -160.88 -166.82 -24.345 48.307 8.6008 350 24030 -173.04 -178.85 -24.782 24.719 10.007 355 24266 -167.02 -172.88 -24.612 36.499 9.0806