# Eastern Equatorial Pacific Stable Isotope and Alkenone Data and SST Reconstruction over the last 25Kyr #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: http://www.ncdc.noaa.gov/paleo/study/19684 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/bova2015/bova2015-ggc43-cdh41.txt # # Archive: Paleoceanography # # Parameter_Keywords: age control, oxygen isotopes, carbon isotopes, biomarkers #--------------------------------------- # Contribution_Date # Date: 2016-01-20 #--------------------------------------- # Title # Study_Name: Eastern Equatorial Pacific Stable Isotope and Alkenone Data and SST Reconstruction over the last 25Kyr #--------------------------------------- # Investigators # Investigators: Bova, Samantha C.; Herbert, Timothy D.; Rosenthal, Yair; Kalansky, Julie; Altabet, Mark A.; Chazen, Caitlin; Mojarro, Angel; Zech, Jana #--------------------------------------- # Description and Notes # Description: Measurement errors- Uk'37: 0.05, C37 Alkenone abundance: 0.1. # Provided Keywords: Sea Surface Temperature Reconstruction #--------------------------------------- # Publication # Authors: Samantha C. Bova, Timothy Herbert, Yair Rosenthal, Julie Kalansky, Mark Altabet, Caitlin Chazen, Angel Mojarro, Jana Zech # Published_Date_or_Year: 2015 # Published_Title: Links between eastern equatorial Pacific stratification and atmospheric CO2 rise during the last deglaciation # Journal_Name: Paleoceanography # Volume: 30 # Edition: # Issue: 11 # Pages: 1407-1424 # Report Number: # DOI: 10.1002/2015PA002816 # Online_Resource: # Full_Citation: # Abstract: It is difficult to untangle the mixed influences of high- and low-latitude climate forcing in the eastern equatorial Pacific (EEP). Here we test the hypothesis that the Southern Ocean drove change in the EEP via subsurface intermediate waters during the last deglaciation. We use the d18O signature of benthic foraminifera to reconstruct water density changes during the last 25?kyr at three intermediate water depths (370?m, 600?m, and 1000?m) in the EEP. Carbonate d18O records a combined signature of temperature and salinity and is therefore more closely related to density than temperature or salinity alone. We find that benthic foraminiferal d18O values decreased first in the subsurface, simultaneously with rising temperatures over Antarctica, and propagated up to the surface within ~3?kyr. The early subsurface response initiated a rapid decrease in density stratification over the upper water column as indicated by reduced d18O gradients between surface and intermediate depths. Stratification of the upper water column remained low through the termination, with stratification minima reached during Heinrich Stadial 1 and the Younger Dryas (YD), synchronous with the two-part deglacial rise in atmospheric CO2. Centennial-scale shifts toward heavier d18O signatures at 370 and 600?m during the YD indicate short-lived shifts in the Subantarctic Mode Water/Antarctic Intermediate Water boundary to shallower intermediate depths. We suggest that decreased density gradients during the deglaciation accelerated vertical mixing across the EEP, and potentially the entire South Pacific subtropical gyre, which enhanced CO2 delivery from depth to the surface ocean and atmosphere. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: OCE 1003387 #--------------------------------------- # Site Information # Site_Name: KNR195-5 GGC43/CDH41 # Location: Eastern Equatorial Pacific # Country: # Northernmost_Latitude: -1.252167 # Southernmost_Latitude: -1.265667 # Easternmost_Longitude: -89.6845 # Westernmost_Longitude: -89.698 # Elevation: #--------------------------------------- # Data_Collection # Collection_Name: KNR195-5 GGC43/CDH41 Bova15 # First_Year: 25800 # Last_Year: 1340 # Time_Unit: cal yr BP # Core_Length: # Notes: Data from KNR 195-5 GGC 43 (01°15.13'S, 89° 41.07'W, 617 m) and KNR 195-5 CDH 41 (01° 15.94'S, 89° 41.88'W, 595 m) has been spliced together. #--------------------------------------- # Chronology_Information # Chronology: # # Chronology Data for GGC43 # Labcode # depth_top # depth_bottom # mat.dated # 14C.raw # 14C.raw_err # datemeth # reservoir # calib.14C # calib_method # rejected # notes # # Labcode depth_top depth_bottom mat.dated 14C.raw 14C.raw_err datemeth reservoir calib.14C calib_method rejected notes # OS-99077 1.5 2.5 G. ruber 1990 50 14C AMS 500 1370 Fairbanks0107 no NaN # OS-109329 39.5 40.5 G. ruber 4630 40 14C AMS 500 4663 Fairbanks0107 no NaN # OS-109330 70 71 G. ruber 6050 35 14C AMS 500 6325 Fairbanks0107 no NaN # OS-99078 99.5 100.5 G. ruber 8030 50 14C AMS 500 8356 Fairbanks0107 no NaN # OS-109333 139.5 140.5 G. ruber 8800 40 14C AMS 500 9313 Fairbanks0107 no NaN # OS-99079 219.5 220.5 G. ruber 11150 70 14C AMS 500 12598 Fairbanks0107 no NaN # OS-99080 279.5 280.5 G. ruber 12600 75 14C AMS 500 13892 Fairbanks0107 no NaN # OS-99081 319.5 320.5 G. ruber 13800 60 14C AMS 500 15487 Fairbanks0107 no NaN # OS-99082 349.5 350.5 G. ruber 15500 70 14C AMS 500 18107 Fairbanks0107 no NaN # # Chronology Data for CDH 41 # Labcode sample identification used by 14C laboratory # depth_top Depth top of sample interval (cm) # depth_bottom Depth bottom of sample interval (cm) # mat.dated Material Dated # 14C.raw conventional radiocarbon age, years before 1950AD # 14C.raw_err radiocarbon age, standard error # datemeth Dating method # reservoir Reservoir correction # calib.14C Calibrated age # calib_method Calibration method # rejected Rejected sample (yes/no) # notes Notes # # Labcode depth_top depth_bottom mat.dated 14C.raw 14C.raw_err datemeth reservoir calib.14C calib_method rejected notes # OS-99072 0.25 0.5 G. ruber 9580 50 14C AMS 500 10231 Fairbanks0107 yes NaN # OS-113942 4.25 4.75 G. ruber 10500 45 14C AMS 500 11443 Fairbanks0107 no NaN # OS-102469 9.75 10.25 G. ruber 12150 100 14C AMS 500 13513 Fairbanks0107 no NaN # OS-102711 15 15.5 G. ruber 12550 45 14C AMS 500 13849 Fairbanks0107 no NaN # OS-113944 17 17.5 G. ruber 12750 55 14C AMS 500 14041 Fairbanks0107 no NaN # OS-102466 20 20.5 G. ruber 11850 65 14C AMS 500 13191 Fairbanks0107 no NaN # OS-113946 25 25.5 G. ruber 13800 55 14C AMS 500 15487 Fairbanks0107 no NaN # OS-99073 29.75 30.25 G. ruber 14350 60 14C AMS 500 16130 Fairbanks0107 yes NaN # OS-113948 35 35.5 G. ruber 13950 60 14C AMS 500 15658 Fairbanks0107 no NaN # OS-102713 40 40.5 G. ruber 12700 50 14C AMS 500 13985 Fairbanks0107 yes NaN # OS-113950 47 47.5 G. ruber 14300 70 14C AMS 500 16068 Fairbanks0107 no NaN # OS-102715 55 55.5 G. ruber 14450 60 14C AMS 500 16263 Fairbanks0107 no NaN # OS-99074 69.75 70.25 G. ruber 15650 80 14C AMS 500 18373 Fairbanks0107 no NaN # OS-102717 89.75 90.25 G. ruber 18150 90 14C AMS 500 20883 Fairbanks0107 no NaN # OS-119357 100 100.5 G. ruber 18750 100 14C AMS 500 21766 Fairbanks0107 no NaN # OS-99075 115 115.5 G. ruber 19700 140 14C AMS 500 22806 Fairbanks0107 no NaN # OS-102719 134.75 135.25 G. ruber 20400 120 14C AMS 500 23779 Fairbanks0107 no NaN # OS-99076 169.75 170.25 G. ruber 20600 120 14C AMS 500 24007 Fairbanks0107 no NaN # OS-119358 215 215.5 G. ruber 14200 60 14C AMS 500 15946 Fairbanks0107 yes NaN # OS-109334 235 235.5 G. ruber 17950 70 14C AMS 500 20627 Fairbanks0107 yes NaN # OS-119359 255 255.5 G. ruber 24700 210 14C AMS 500 28958 Fairbanks0107 no NaN # OS-109363 275 275.5 G. ruber 24000 120 14C AMS 500 28172 Fairbanks0107 yes NaN # OS-109458 290 290.5 G. ruber 27200 190 14C AMS 500 31986 Fairbanks0107 yes NaN # OS-119360 310 310.5 G. ruber 26200 260 14C AMS 500 30905 Fairbanks0107 no NaN # #--------------------------------------- # 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) ## core core name,,,,,,,,C ## depth_cm depth,,,centimeters,,,,,N ## age_calyrBP age,,,calendar years before 1950AD,,Paleoceanography,,,N ## d13Cu.pereg delta 13C,Uvigerina peregrina,,per mil VPDB,,Paleoceanography,,analytical technique: isotope ratio mass spectrometer,N ## d18Ou.pereg delta 18O,Uvigerina peregrina,,per mil VPDB,,Paleoceanography,,analytical technique: isotope ratio mass spectrometer,N #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: core depth_cm age_calyrBP d13Cu.pereg d18Ou.pereg GGC43 2.00 1340.39 -0.59 2.134 GGC43 20.00 3178.31 -0.67 2.4605 GGC43 40.00 4725.08 -0.70 2.159 GGC43 60.00 5942.08 -0.58 2.1355 GGC43 80.00 6969.19 -0.60 2.1035 GGC43 100.00 7895.82 -0.63 2.099 GGC43 120.00 8770.60 -0.77 2.25 GGC43 130.50 9215.97 -0.78 2.2045 GGC43 140.00 9611.01 -0.70 2.2235 GGC43 145.50 9835.93 -0.66 2.272 GGC43 160.00 10413.05 -0.71 2.353 GGC43 170.50 10813.61 -0.79 2.13 GGC43 175.50 10998.31 -0.77 2.1895 GGC43 180.00 11160.86 -0.69 2.398 GGC43 195.00 11675.11 -0.82 2.4475 GGC43 200.00 11836.44 -0.83 2.3665 GGC43 203.00 11930.72 -0.65 2.420667 GGC43 205.00 11992.51 -0.87 2.494 GGC43 210.00 12143.29 -0.75 2.5805 GGC43 215.00 12288.82 -0.81 2.805 GGC43 220.00 12429.24 -0.75 2.8785 GGC43 225.00 12564.76 -0.83 2.7775 GGC43 230.00 12695.72 -0.82 2.7075 GGC43 235.00 12822.56 -0.83 2.945 GGC43 240.00 12945.84 -0.73 2.8655 GGC43 245.00 13066.27 -0.80 2.9385 GGC43 250.00 13184.69 -0.89 2.762 GGC43 255.00 13302.09 -0.83 2.632 GGC43 260.00 13419.62 -0.76 2.88 GGC43 265.00 13538.62 -0.88 2.761 GGC43 270.00 13660.59 -0.64 3.1365 GGC43 275.00 13787.21 -0.81 2.8625 GGC43 280.00 13920.40 -0.83 2.6815 GGC43 285.00 14062.24 -0.82 2.93 GGC43 290.00 14215.06 -0.80 2.904 GGC43 295.00 14381.40 -0.80 2.996 GGC43 300.00 14564.06 -0.73 3.034 GGC43 305.00 14766.06 -0.80 3.0135 GGC43 310.00 14990.68 -0.78 3.047 GGC43 313.00 15137.78 -0.61 3.144 GGC43 315.00 15241.47 -0.77 3.078 GGC43 318.00 15406.10 -0.75 3.0225 GGC43 320.00 15522.27 -0.65 3.2485 GGC43 323.00 15706.85 -0.60 3.0375 GGC43 325.00 15837.18 -0.80 2.863 GGC43 328.00 16044.31 -0.66 3.02975 GGC43 330.00 16190.59 -0.71 3.039667 GGC43 333.00 16423.07 -0.64 2.9795 GGC43 335.00 16587.22 -0.65 3.195333 GGC43 338.00 16848.02 -0.57 3.20625 GGC43 340.00 17032.08 -0.82 3.3785 GGC43 343.00 17324.36 -0.55 3.17175 GGC43 345.00 17530.51 -0.83 3.156 GGC43 348.00 17857.63 -0.65 3.188 GGC43 350.00 18088.18 -0.75 3.334 GGC43 353.00 18453.70 -0.44 3.2515 GGC43 355.00 18711.09 -0.84 3.2175 GGC43 358.00 19118.79 -0.48 3.205 GGC43 360.00 19405.61 -0.71 3.1315 GGC43 363.00 19859.47 -0.58 3.088 GGC43 365.00 20178.45 -0.71 3.318 CDH 41 85.25 20265.11 -0.67 3.454 CDH 41 87.25 20431.14 -0.45 3.431 CDH 41 90.00 20653.54 -0.75 3.1635 CDH 41 92.25 20830.39 -0.41 3.266 CDH 41 95.25 21058.99 -0.74 3.2535 CDH 41 97.25 21206.79 -0.58 3.1945 CDH 41 100.25 21421.64 -0.70 3.128 CDH 41 105.25 21761.58 -0.67 3.404 CDH 41 110.00 22063.94 -0.74 3.3365 CDH 41 115.25 22375.69 -0.77 3.4525 CDH 41 120.25 22651.79 -0.68 3.123 CDH 41 125.00 22896.54 -0.72 3.327 CDH 41 130.00 23137.18 -0.76 3.2645 CDH 41 135.00 23362.10 -0.60 3.348 CDH 41 140.25 23583.41 -0.67 3.3155 CDH 41 145.00 23772.43 -0.69 3.248 CDH 41 150.00 23961.96 -0.66 3.143 CDH 41 155.00 24143.92 -0.54 3.2365 CDH 41 160.00 24320.51 -0.60 3.0725 CDH 41 165.00 24493.94 -0.69 3.266 CDH 41 170.00 24666.36 -0.61 3.041 CDH 41 175.00 24839.89 -0.72 3.28 CDH 41 180.25 25025.51 -0.58 3.2325 CDH 41 185.00 25198.28 -0.63 3.2895 CDH 41 190.00 25386.80 -0.62 3.237 CDH 41 195.00 25583.69 -0.69 3.2825 CDH 41 200.25 25800.95 -0.64 3.199667