# Eastern Pacific Alkenone Sea Surface Temperature Reconstruction over the past 144,000 years #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 4.0 # Encoding: UTF-8 # NOTE: Please cite original publication, NOAA Landing Page URL, dataset and publication DOIs (where available), and date accessed when using downloaded data. # If there is no publication information, please cite investigator, study title, NOAA Landing Page URL, and date accessed. # # Description/Documentation lines begin with '#' followed by a space # Data lines have no '#' # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/36293 # Landing_Page_Description: NOAA Landing Page of this file's parent study, which includes all study metadata. # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-recon-36293.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Climate Reconstructions # # Dataset_DOI: 10.25921/56hd-3096 # # Science_Keywords: #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/reconstructions/kumar2022/nh22p_kumar2022.txt # Data_Download_Description: NOAA Template File; SST Reconstruction Data # #--------------------------------------- # Contribution_Date # Date: 2022-04-19 #--------------------------------------- # File_Last_Modified_Date # Date: 2022-07-08 #--------------------------------------- # Title # Study_Name: Eastern Pacific Alkenone Sea Surface Temperature Reconstruction over the past 144,000 years #--------------------------------------- # Investigators # Investigators: Meegan Kumar, Dervla; Tierney, Jessica E.; Bhattacharya, Tripti; Zhu, Jiang; Murray, James W. #--------------------------------------- # Description_Notes_and_Keywords # Description: #--------------------------------------- # Publication # Authors: Meegan Kumar, Dervla; Tierney, Jessica E.; Bhattacharya, Tripti; Zhu, Jiang; Murray, James W. # Published_Date_or_Year: 2022-05-28 # Published_Title: Glacial warming in the Eastern Pacific Warm Pool # Journal_Name: Geophysical Research Letters # Volume: 49 # Edition: # Issue: 10 # Pages: # Report_Number: e2022GL098830 # DOI: 10.1029/2022GL098830 # Online_Resource: # Full_Citation: # Abstract: The Eastern Pacific Warm Pool (EPWP) modulates global climate through its connection with tropical Pacific circulation, but sparse paleoceanographic data from this region limits our understanding of its role in past climate variability. We present a 144 kyr alkenone-sea surface temperature (SST) reconstruction from core NH22P, located in the northern EPWP, that shows local warming occurred during periods of global cooling. Climate model simulations of the Last Glacial Maximum indicate that both ice sheet and greenhouse gas forcing slowed wind speeds over the EPWP, which attenuated glacial cooling of local SST via the wind-evaporation-SST feedback. Spectral analysis further suggests precessional pacing of the warming spikes. Vernal equinox insolation could explain this pacing as direct shortwave heating during boreal spring would have contributed to the early seasonal intensification of the EPWP. This work provides crucial constraints on tropical Pacific glacial climate variability and highlights the unique response of the EPWP to global climate forcings. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: OCE-1651034, AGS-160230 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Heising-Simons Foundation # Grant: #2016-015 #--------------------------------------- # Site_Information # Site_Name: NH22P # Location: Eastern Pacific # Northernmost_Latitude: # Southernmost_Latitude: 22.52 # Easternmost_Longitude: 22.52 # Westernmost_Longitude: -106.52 # Elevation_m: -106.52 #--------------------------------------- # Data_Collection # Collection_Name: NH22P_Kumar2022 # First_Year: 144467 # Last_Year: 2430 # Time_Unit: cal yr BP # Core_Length_m: 7.01 # Parameter_Keywords: sea surface temperature # Notes: #--------------------------------------- # Chronology_Information # Chronology: # Labcode sample identification used by 14C laboratory # mid.depth Depth middle 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 # delta-R Deviation from global mean reservoir correction # delta-R_err delta-R standard error # calib.14C Calibrated age # calib.14C_1sig_lo Calibrated age, 1-sigma lower confidence bound # calib.14C_1sig_up Calibrated age, 1-sigma upper confidence bound # calib_method Calibration method # # # Labcode mid.depth mat.dated 14C.raw 14C.raw_err datemeth delta-R delta-R_err calib.14C calib.14C_1sig_lo calib.14C_1sig_up calib_method # C1_GP98 2 organic carbon 3105 51 14C AMS 215 18 Marine21 # C2_GP98 32 organic carbon 6787 65 14C AMS 215 18 Marine21 # C3_GP98 47 organic carbon 10361 68 14C AMS 215 18 Marine21 # C4_GP98 71 organic carbon 13246 84 14C AMS 215 18 Marine21 # C5_GP98 91 organic carbon 16803 167 14C AMS 215 18 Marine21 # C6_GP98 151 organic carbon 21152 185 14C AMS 215 18 Marine21 # T1_DMK18 336 benthic d18O 56000 54000 58000 correlation to Lisiecki et al. 2005 # T2_DMK18 401 benthic d18O 75000 73000 77000 correlation to Lisiecki et al. 2005 # T3_DMK18 476 benthic d18O 87000 85000 89000 correlation to Lisiecki et al. 2005 # T4_DMK18 521 benthic d18O 109000 107000 111000 correlation to Lisiecki et al. 2005 # T5_DMK18 546 benthic d18O 123000 121000 125000 correlation to Lisiecki et al. 2005 # T6_DMK18 586 benthic d18O 130000 128000 132000 correlation to Lisiecki et al. 2005 # T7_DMK18 606 benthic d18O 135000 133000 137000 correlation to Lisiecki et al. 2005 # # #--------------------------------------- # Variables # PaST_Thesaurus_Download_Resource: https://www.ncei.noaa.gov/access/paleo-search/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-var components: what, material, error, units, seasonality, data type, detail, method, C or N for Character or Numeric data) # ## depth_cm depth,,,centimeter,,Climate Reconstructions; paleoceanography,,,N, ## age age,,,calendar year before present,,Climate Reconstructions; paleoceanography,,,N,Median age ## C37_2 C37:2 alkenone,,,nanogram per gram,,paleoceanography,,gas chromatography - flame ionization detection,N, ## C37_3 C37:3 alkenone,,,nanogram per gram,,paleoceanography,,gas chromatography - flame ionization detection,N, ## UK_37 alkenone unsaturation index Uk37 prime,,,dimensionless,,paleoceanography,,gas chromatography - flame ionization detection,N, ## sst sea surface temperature,alkenone unsaturation index,,degree Celsius,annual,Climate Reconstructions; paleoceanography,,Bayesian inference;regression analysis,N,BAYSPLINE calibration ## sst_1sig_lo sea surface temperature,alkenone unsaturation index,,one standard deviation lower bound,degree Celsius,annual,Climate Reconstructions; paleoceanography,,Bayesian inference;regression analysis,N,BAYSPLINE calibration ## sst_1sig_hi sea surface temperature,alkenone unsaturation index,,one standard deviation upper bound,degree Celsius,annual,Climate Reconstructions; paleoceanography,,Bayesian inference;regression analysis,N,BAYSPLINE calibration #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: -999 depth_cm age C37_2 C37_3 UK_37 sst sst_1sig_lo sst_1sig_hi 3.5 2430 10252.0 2232.3 0.821 22.86 19.97 26.36 10.5 3453 9876.2 2044.0 0.829 23.15 20.21 26.80 18.5 4697 9361.3 1910.6 0.831 23.21 20.30 26.89 24.5 5628 9195.1 1847.8 0.833 23.27 20.32 27.08 31.5 6588 10384.9 1939.0 0.843 23.60 20.63 27.69 35.5 7624 9729.1 1964.0 0.832 23.24 20.31 26.94 38.5 8442 9718.3 2003.7 0.829 23.13 20.22 26.77 43.5 9867 9154.6 1814.1 0.835 23.34 20.38 27.22 45.5 10391 10130.1 1993.8 0.836 23.38 20.45 27.28 50.5 11296 9356.3 1923.8 0.829 23.12 20.19 26.81 56.5 12225 14550.2 2933.4 0.832 23.24 20.30 27.05 63.5 13361 9693.1 1950.0 0.833 23.27 20.33 27.07 75.5 15420 13744.8 1923.9 0.877 24.90 21.74 30.49 78.5 16095 19159.7 2428.3 0.888 25.36 22.11 31.63 86.5 17980 21717.7 2046.1 0.914 26.63 23.04 33.90 89.5 18498 25643.0 2490.2 0.911 26.47 22.87 33.49 94.5 19145 28851.2 3008.2 0.906 26.23 22.75 33.24 101.5 19727 27841.9 2867.5 0.907 26.29 22.77 33.24 106.5 20164 20549.5 2012.5 0.911 26.49 22.93 33.52 112.5 20717 17553.1 2379.1 0.881 25.10 21.88 30.97 117.5 21162 16421.8 2204.5 0.882 25.16 21.97 31.17 121.5 21526 11489.2 1398.0 0.892 25.57 22.28 31.89 128.5 22143 11829.7 1398.0 0.894 25.68 22.38 32.34 132.5 22512 10212.6 1087.9 0.904 26.15 22.67 33.02 138.5 23047 12929.9 1041.6 0.925 27.21 23.40 34.87 141.5 23321 12853.9 1089.9 0.922 27.05 23.29 34.30 151.5 24186 6054.3 580.2 0.913 26.60 22.96 33.80 157.5 25146 4238.3 710.8 0.856 24.09 21.07 28.73 161.5 25889 3991.9 753.5 0.841 23.53 20.61 27.63 173.5 28121 6198.0 1390.3 0.817 22.75 19.86 26.29 177.5 28865 6776.4 1521.8 0.817 22.76 19.84 26.23 181.5 29644 6206.6 1387.6 0.817 22.76 19.86 26.18 189.5 31163 5487.6 1217.1 0.818 22.78 19.88 26.19 196.5 32468 3406.8 717.3 0.826 23.04 20.13 26.66 200.5 33194 6302.3 1353.4 0.823 22.93 20.03 26.49 206.5 34326 5068.0 1224.0 0.805 22.34 19.46 25.56 211.5 35271 5883.5 1343.4 0.814 22.65 19.72 26.08 223.5 37544 8084.3 1771.5 0.820 22.84 19.95 26.40 227.5 38283 7681.0 1638.7 0.824 22.97 20.07 26.56 234.5 39601 9967.9 1891.3 0.841 23.57 20.61 27.57 237.5 40178 10265.9 1885.1 0.845 23.69 20.74 27.89 244.5 41507 10345.5 2105.9 0.831 23.20 20.26 26.95 249.5 42467 9149.8 1823.5 0.834 23.31 20.36 27.17 255.5 43591 7962.0 1726.9 0.822 22.89 19.97 26.42 258.5 44141 8551.1 1888.5 0.819 22.81 19.88 26.32 263.5 45077 8274.3 1745.5 0.826 23.05 20.14 26.70 266.5 45622 7824.0 1722.6 0.820 22.83 19.93 26.26 272.5 46738 9315.0 2004.3 0.823 22.95 20.02 26.56 276.5 47512 9915.1 2098.8 0.825 23.00 20.11 26.59 283.5 48805 10637.0 2434.0 0.814 22.63 19.72 26.02 287.5 49540 11488.1 2698.6 0.810 22.51 19.59 25.82 294.5 50884 10948.8 2232.5 0.831 23.19 20.24 26.87 297.5 51446 10393.4 2237.8 0.823 22.94 20.04 26.49 304.5 52759 12314.0 2433.5 0.835 23.33 20.41 27.12 308.5 53496 16356.0 3171.9 0.838 23.45 20.50 27.40 314.5 54607 7446.6 1461.2 0.836 23.39 20.45 27.25 318.5 55356 9700.2 1755.9 0.847 23.78 20.82 28.00 326.5 56837 14381.5 2827.5 0.836 23.37 20.44 27.29 331.5 57739 12077.0 2397.2 0.834 23.31 20.39 27.08 337.5 58925 13228.3 2298.3 0.852 23.94 20.95 28.32 346.5 61137 16889.3 3279.4 0.837 23.40 20.48 27.25 349.5 61831 16950.3 2487.6 0.872 24.72 21.57 30.09 352.5 62591 22583.6 3570.1 0.863 24.36 21.31 29.40 357.5 63839 12165.5 1687.9 0.878 24.96 21.81 30.60 367.5 66327 19948.1 2376.8 0.894 25.68 22.34 32.07 374.5 68053 8276.3 1323.0 0.862 24.34 21.28 29.25 378.5 69089 6184.1 1757.3 0.779 21.52 18.64 24.55 382.5 70118 4920.8 1386.2 0.780 21.56 18.70 24.52 386.5 71099 7215.7 1780.9 0.802 22.24 19.37 25.41 390.5 72081 5605.0 1643.1 0.773 21.35 18.52 24.34 393.5 72810 4674.2 1342.6 0.777 21.47 18.65 24.46 398.5 73989 6160.4 1642.9 0.789 21.85 18.97 24.90 403.5 75212 5200.7 1363.0 0.792 21.95 19.08 25.09 407.5 76118 6829.6 1875.3 0.785 21.72 18.86 24.77 410.5 76823 6414.9 1776.8 0.783 21.66 18.82 24.72 416.5 78188 6722.5 1726.6 0.796 22.05 19.19 25.25 420.5 79065 8092.1 2021.7 0.800 22.19 19.27 25.39 424.5 79973 6276.0 1653.5 0.791 21.91 19.08 25.00 429.5 81139 8655.3 2000.9 0.812 22.58 19.67 25.89 433.5 82037 8066.2 1809.9 0.817 22.73 19.86 26.16 437.5 82962 4581.4 1141.9 0.800 22.20 19.34 25.36 442.5 84114 8281.6 1799.3 0.822 22.89 19.99 26.43 446.5 85038 7043.3 1435.3 0.831 23.21 20.25 26.95 450.5 85939 7021.9 1513.9 0.823 22.94 20.03 26.50 455.5 87070 7338.6 1485.9 0.832 23.23 20.33 27.05 458.5 87772 7625.5 1568.4 0.829 23.15 20.22 26.86 463.5 88869 6616.8 1417.1 0.824 22.95 20.03 26.49 467.5 89787 5882.8 1218.6 0.828 23.11 20.21 26.71 472.5 90968 6183.1 1372.4 0.818 22.76 19.87 26.23 476.5 91993 7587.6 1771.8 0.811 22.54 19.68 25.88 478.5 92702 11604.4 2641.3 0.815 22.66 19.74 26.16 482.5 94244 3470.6 811.1 0.811 22.54 19.64 25.89 484.5 95042 6138.8 1488.6 0.805 22.33 19.49 25.58 487.5 96196 7804.3 1845.6 0.809 22.49 19.58 25.82 489.5 96982 7156.5 1739.0 0.805 22.36 19.47 25.62 492.5 98105 9021.0 2031.9 0.816 22.70 19.83 26.12 494.5 98936 7361.8 1777.5 0.806 22.37 19.50 25.67 497.5 100132 9739.7 2310.8 0.808 22.44 19.58 25.79 502.5 102097 10058.3 2427.6 0.806 22.37 19.49 25.61 505.5 103293 8140.0 1819.1 0.817 22.75 19.82 26.20 508.5 104449 9385.3 2182.7 0.811 22.54 19.68 25.91 510.5 105242 6236.0 1519.7 0.804 22.34 19.46 25.61 513.5 106367 8525.7 2174.5 0.797 22.07 19.22 25.29 516.5 107540 8787.0 1791.0 0.831 23.20 20.30 26.89 520.5 109067 5973.5 1011.4 0.855 24.06 21.06 28.58 523.5 110261 5659.4 819.3 0.874 24.81 21.67 30.33 525.5 111032 5678.1 848.8 0.870 24.63 21.55 30.01 529.5 112627 5576.9 799.8 0.875 24.86 21.71 30.46 531.5 113438 5063.9 766.4 0.869 24.61 21.50 29.98 533.5 114281 5365.5 868.0 0.861 24.29 21.24 29.15 535.5 115140 5041.5 874.5 0.852 23.95 20.90 28.41 539.5 116787 4251.5 817.8 0.839 23.46 20.55 27.36 543.5 118411 3955.2 776.0 0.836 23.37 20.45 27.18 546.5 119569 3751.9 801.7 0.824 22.96 20.10 26.51 561.5 123259 3923.0 789.8 0.832 23.23 20.28 27.03 565.5 124280 3322.4 755.2 0.815 22.66 19.80 26.04 569.5 125279 2515.7 652.7 0.794 21.99 19.15 25.16 575.5 126780 3074.7 861.7 0.781 21.58 18.74 24.61 578.5 127503 3287.7 937.8 0.778 21.49 18.64 24.49 580.5 127985 3580.1 1088.1 0.767 21.18 18.35 24.10 582.5 128463 3086.9 1009.1 0.754 20.76 17.94 23.71 585.5 129173 3282.0 1093.1 0.750 20.64 17.83 23.59 587.5 129660 3617.0 1119.1 0.764 21.08 18.21 24.01 590.5 130333 3500.3 1161.0 0.751 20.68 17.84 23.58 594.5 131230 3391.9 1138.5 0.749 20.61 17.75 23.51 600.5 132521 3386.9 1226.2 0.734 20.16 17.30 23.00 603.5 133158 3843.9 1349.6 0.740 20.35 17.50 23.24 607.5 133999 4054.2 1409.4 0.742 20.39 17.54 23.27 610.5 134589 4174.4 1338.7 0.757 20.86 18.03 23.77 615.5 135558 4709.9 1429.4 0.767 21.16 18.31 24.10 620.5 136542 4604.2 1450.0 0.760 20.95 18.11 23.87 624.5 137329 2716.3 713.5 0.792 21.94 19.08 25.02 630.5 138522 5664.4 1694.0 0.770 21.24 18.39 24.20 634.5 139295 6245.7 1767.7 0.779 21.53 18.68 24.52 640.5 140475 4540.7 1322.7 0.774 21.40 18.53 24.38 646.5 141680 5050.9 1449.6 0.777 21.49 18.64 24.46 650.5 142466 4767.5 1347.8 0.780 21.56 18.69 24.62 654.5 143261 5546.9 1524.1 0.784 21.69 18.85 24.79 660.5 144467 4701.4 1398.4 0.771 21.27 18.45 24.30