# Alkenone SST reconstructions from the eastern tropical Pacific 0-30 ky BP #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # 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: https://www.ncdc.noaa.gov/paleo/study/25670 # Description: NOAA Landing Page # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/koutavas2008/koutavas2008-v19-30.txt # Description: NOAA location of the template # # Data_Type: Paleoceanography # # Dataset_DOI: # # Parameter_Keywords: biomarkers, reconstruction #--------------------------------------- # Contribution_Date # Date: 2018-11-26 #--------------------------------------- # File_Last_Modified_Date # Date: 2018-11-26 #--------------------------------------- # Title # Study_Name: Alkenone SST reconstructions from the eastern tropical Pacific 0-30 ky BP #--------------------------------------- # Investigators # Investigators: Koutavas, A.; Sachs, J.P. #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: Eastern Equatorial Pacific, alkenones #--------------------------------------- # Publication # Authors: Koutavas, A., and J.P. Sachs # Published_Date_or_Year: 2008 # Published_Title: Northern timing of degaciation in the eastern equatorial Pacific from alkenone paleothermometry # Journal_Name: Paleoceanography # Volume: 23 # Edition: # Issue: # Pages: 1-10 # Report_Number: PA4205 # DOI: 10.1029/2008PA001593 # Online_Resource: # Full_Citation: # Abstract: The equatorial cold tongue (ECT) of the eastern Pacific is the most dynamic ocean region in the world's tropics and sets the tempo for global climate anomalies arising from El Niño–Southern Oscillation (ENSO) events. This region's deglaciation history and relationship with north and south polar climates remains poorly understood, impeding integration of tropical Pacific ocean‐atmosphere dynamics and ENSO variability in our understanding of glacial cycles. Here we present alkenone reconstructions of sea surface temperature (SST) across the last glacial termination from five ECT cores east of the Galapagos Islands. A composite index of SST based on these demonstrates strong temporal affinity with the two‐step deglaciation of the Northern Hemisphere, composed of two distinct warming steps at the beginning of the Bölling and the end of the Younger Dryas intervals. Within dating uncertainty, warming in the ECT began in phase with the Bölling excursion, was followed by a 2–3 ka plateau, and resumed with a second pulse at the end of the Younger Dryas. On the basis of our reconstructions, about two thirds of the warming materialized at or after the end of the Younger Dryas, implying a marked delay in the region's response to deglaciation. The results challenge the prevailing paradigm that ECT deglacial history conforms to an Antarctic timing, commonly attributed to advection from the Southern Ocean through an interior oceanic link, or to synchronous response of both regions to CO2 forcing. Our results emphasize instead the role of dynamical adjustments linked to Northern Hemisphere processes, most likely transmitted through the atmosphere. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: 0624954 #--------------------------------------- # Site_Information # Site_Name: V19-30 # Location: Eastern Pacific Ocean # Country: # Northernmost_Latitude: -3.38 # Southernmost_Latitude: -3.38 # Easternmost_Longitude: -83.52 # Westernmost_Longitude: -83.52 # Elevation: -3091 #--------------------------------------- # Data_Collection # Collection_Name: V19-30 alkenones Koutavas2008 # First_Year: 25430 # Last_Year: 1000 # Time_Unit: cal yr BP # Core_Length: # Notes: #--------------------------------------- # Chronology_Information # Chronology: #--------------------------------------- # 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) ## coreID notes,,,,,Paleoceanography,,,C,sediment core identification ## depth_cm depth,,,centimeter,,Paleoceanography,,,N, ## age_calkyBP age,,,calendar kiloyear before present,,Paleoceanography,,,N, ## Uk'37 alkenone unsaturation index Uk37 prime,alkenone,,,,Paleoceanography,,gas chromatography - flame ionization detection,N, ## sst_degC sea surface temperature,alkenone,,degree Celsius,,Paleoceanography,,,N, ## totC37_ng/g C37 alkenone,alkenone,,nanogram per gram,,Paleoceanography,,gas chromatography - flame ionization detection,N,total C37 alkenone concentration #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: -999 coreID depth_cm age_calkyBP Uk'37 sst_degC totC37_ng/g V19-30 0.0 1 0.8118 22.73 2193.20 V19-30 2.0 1.28 0.7975 22.31 2258.44 V19-30 6.0 1.83 0.8162 22.86 1597.94 V19-30 10.0 2.38 0.7967 22.29 2144.69 V19-30 15.0 3.07 0.8072 22.6 1260.99 V19-30 20.0 3.76 0.7926 22.16 1680.39 V19-30 25.0 4.45 0.7871 22 1521.87 V19-30 30.0 5.14 0.8000 22.38 1281.00 V19-30 35.0 5.83 0.8037 22.49 1390.16 V19-30 40.0 6.52 0.7937 22.2 1517.62 V19-30 44.0 7.07 0.8101 22.68 -999.00 V19-30 49.0 7.76 0.7966 22.28 1001.41 V19-30 55.0 8.59 0.7962 22.27 836.86 V19-30 58.0 9 0.7939 22.2 1053.42 V19-30 64.0 9.83 0.7929 22.17 1389.55 V19-30 69.0 10.52 0.7796 21.78 1155.97 V19-30 75.0 11.34 0.7586 21.17 1257.98 V19-30 80.0 12.03 0.7502 20.92 1565.76 V19-30 85.0 12.72 0.7584 21.16 1411.64 V19-30 90.0 13.21 0.7557 21.08 2051.45 V19-30 95.0 13.56 0.7574 21.13 1742.40 V19-30 101.5 14.02 0.7579 21.14 2332.68 V19-30 104.0 14.2 0.7515 20.96 2352.34 V19-30 109.0 14.55 0.7659 21.38 2055.03 V19-30 115.0 14.97 0.7537 21.02 1658.31 V19-30 119.0 15.25 0.7351 20.47 1781.74 V19-30 125.0 15.72 0.7335 20.43 2481.04 V19-30 130.0 16.11 0.7321 20.39 1971.12 V19-30 133.0 16.35 0.7365 20.51 2381.09 V19-30 139.0 16.83 0.7451 20.77 2525.19 V19-30 142.0 17.07 0.7386 20.58 2197.03 V19-30 146.5 17.38 0.7319 20.38 1689.30 V19-30 152.0 17.86 0.7345 20.46 2405.35 V19-30 156.5 18.22 0.7292 20.3 2232.94 V19-30 160.0 18.5 0.7396 20.61 2631.96 V19-30 166.0 18.98 0.7473 20.83 2781.07 V19-30 172.0 19.45 0.7394 20.72 3307.66 V19-30 176.0 19.78 0.7552 21.06 2604.78 V19-30 183.0 20.33 0.7330 20.41 2938.76 V19-30 190.0 20.88 0.7397 20.61 2812.85 V19-30 194.0 21.2 0.7415 20.66 2715.54 V19-30 199.0 21.6 0.7384 20.57 2576.97 V19-30 210.0 22.47 0.7488 20.88 2186.04 V19-30 214.0 22.79 0.7544 21.04 2186.04 V19-30 218.5 23.15 0.7633 21.3 2186.04 V19-30 225.0 23.67 0.7378 20.55 2186.04 V19-30 230.0 24.07 0.7404 20.63 2455.62 V19-30 236.0 24.55 0.7367 20.52 1520.85 V19-30 241.0 25.03 0.7476 20.84 -999.00 V19-30 245.0 25.43 0.7470 20.82 1751.77