# 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/bhattacharya2018md022515.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: MD02-2515 # Location: Ocean>Pacific Ocean>Eastern Pacific Ocean # Country: Mexico # Northernmost_Latitude: 27.48 # Southernmost_Latitude: 27.48 # Easternmost_Longitude: -112.07 # Westernmost_Longitude: -112.07 # Elevation: -881 m #------------------ # Data_Collection # Collection_Name: Bhattacharya2018MD022515 # Earliest_Year: 20995 # Most_Recent_Year: 5818 # Time_Unit: Cal. Years BP # Core_Length: 25.4 # Notes: #------------------ # Chronology_Information # Chronology: See Pichevin, L., Ganeshram, R.S., Reynolds, B.C., Prahl, F., Pedersen, T.F., Thunell, R. and McClymont, E.L., 2012. Silicic acid biogeochemistry in the Gulf of California: Insights from sedimentary Si isotopes. Paleoceanography, 27(2), https://doi.org/10.1029/2011PA002237 # #---------------- # 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 194.5 5818 -150.62 -150.95 -28.038 67.502 8.0194 207.5 6618.6 -149.79 -150.26 -25.903 76.432 8.0141 219.5 7357.7 -151.79 -152.39 -26.404 70.668 7.8996 231.5 7411.7 -149.97 -150.58 -26.301 74.513 7.9625 261.5 7476.2 -143.53 -144.16 -26.782 84.957 7.9845 291.5 7538.5 -146.22 -146.86 -26.647 79.881 8.1049 320.5 7608.1 -150.88 -151.53 -26.845 71.114 7.9319 347.5 7675.5 -144.11 -144.77 -26.574 84.086 7.9198 371.5 7735.9 -152.49 -153.16 -27.049 67.067 8.168 394.5 7795 -145.43 -146.12 -25.491 85.152 8.0555 417.5 7861.9 -149.32 -150.02 -27.089 72.429 7.9416 439.5 7958.5 -148.3 -149.02 -26.614 76.357 7.763 462.5 8069.9 -144.82 -145.53 -27.416 80.134 8.0643 475.5 8167 -149.83 -150.52 -27.133 71.416 8.0492 489.5 8275 -149.23 -149.92 -26.459 75.5 7.8433 503.5 8385.3 -150.96 -151.62 -26.089 73.23 8 530.5 8598.8 -146.72 -147.36 -27.41 76.594 8.0478 544.5 8705.5 -150.09 -150.71 -27.442 70.129 7.9041 572.5 8909.9 -149.65 -150.23 -25.865 76.272 7.9391 612.5 9201.9 -144.1 -144.79 -27.47 80.862 8.1174 668.5 9633 -156.09 -157 -28.836 52.806 8.4142 689.5 9777.9 -147.78 -148.77 -27.163 74.915 8.1678 722.5 9972 -148.46 -149.55 -25.882 77.651 7.881 758.5 10180 -151.49 -152.64 -26.841 68.724 7.991 795.5 10402 -148.19 -149.42 -27.468 72.47 8.0664 982.5 11964 -153.08 -155.65 -26.616 64.16 8.0701 1056.5 12740 -155.58 -158.57 -29.157 48.673 8.4993 1068.5 12844 -155.78 -158.83 -29.157 48.111 8.6208 1095.5 13081 -158.42 -161.61 -29.217 42.439 8.9088 1144.5 13582 -153.58 -157.2 -27.109 59.428 8.1448 1181.5 13918 -149.29 -153.2 -26.536 69.031 7.9367 1201.5 14129 -154.96 -159.02 -27.066 56.147 8.2851 1241.5 14591 -150.96 -155.4 -28.361 57.592 8.1098 1282.5 15046 -156.16 -160.95 -26.117 55.608 8.2372 1302.5 15242 -155.63 -160.61 -26.751 54.444 8.4145 1325.5 15427 -151.72 -156.89 -26.941 60.57 8.0523 1372.5 15809 -155.06 -160.59 -27.689 50.816 8.5358 1395.5 16017 -152.74 -158.47 -26.42 59.465 8.066 1419.5 16229 -155.05 -160.88 -26.745 53.709 8.3116 1461.5 16425 -155.77 -161.69 -26.961 51.53 8.3448 1505.5 16620 -156.01 -162.02 -28.483 45.03 8.7277 1525.5 16699 -149.91 -156 -27.59 59.754 8.137 1549.5 16790 -153.25 -159.36 -26.659 57.005 8.2958 1576.5 16891 -160.31 -166.42 -27.62 40.164 9.0396 1604.5 16994 -154.55 -160.75 -26.809 53.749 8.4022 1658.5 17189 -158.13 -164.41 -26.162 49.408 8.667 1711.5 17396 -153.19 -159.61 -26.567 56.673 8.2406 1815.5 17809 -157.65 -164.26 -28.309 41.378 8.9359 1868.5 18021 -157.47 -164.16 -27.126 46.191 8.7428 1976.5 18401 -159.18 -165.78 -29.066 35.385 9.4355 2204.5 19394 -158.13 -164.65 -27.085 45.461 8.7669 2247.5 19602 -160.13 -166.66 -26.842 42.631 8.7051 2336.5 20033 -156.67 -163.26 -26.624 49.854 8.4967 2466.5 20597 -160.25 -166.65 -26.055 45.134 8.8052 2541.5 20995 -160.96 -167.23 -27.324 40.219 8.7886