# Eastern Pacific Site NH8P 24,000 Year Alkenone Unsaturation Index Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # 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 # # Data lines have no # # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/33655 # Landing_Page_Description: # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-ocean-33655.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Paleoceanography # # Dataset_DOI: 10.25921/1pqk-xv51 # # Science_Keywords: #-------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/contributions_by_author/kumar2021/kumar2021uk37.txt # Data_Download_Description: NOAA Template File; Site NH8P Alkenone Unsaturation Index Data # #-------------------- # Contribution_Date # Date: 2021-06-29 #-------------------- # File_Last_Modified_Date # Date: 2025-06-02 #-------------------- # Title # Study_Name: Eastern Pacific Site NH8P 24,000 Year Alkenone Unsaturation Index Data #-------------------- # Investigators # Investigators: Meegan Kumar, D. #-------------------- # Description_Notes_and_Keywords # Description: Alkenone unsaturation index (UK'37) and principal components for sediments collected at site NH8P, Eastern Pacific, for the past 24,000 years. #-------------------- # Publication # Authors: Meegan Kumar, D., J.E. Tierney, T. Bhattacharya, J. Zhu, L. McCarty, J.W. Murray # Published_Date_or_Year: 2021 # Published_Title: Climatic Drivers of Deglacial SST Variability in the Eastern Pacific # Journal_Name: Paleoceanography and Paleoclimatology # Volume: 36 # Edition: # Issue: 10 # Pages: # Report_Number: e2021PA004264 # DOI: 10.1029/2021PA004264 # Online_Resource: # Full_Citation: # Abstract: We explore the response of northeastern Pacific sea surface temperature (SST) to deglacial (~16–7 ka) climate variability as recorded in Uk'37-based SST reconstructions spanning 65°N to 10°S. Included in the analysis is a new 23 kyr SST record from core NH8P from the northwest Mexican Margin. We isolate spatiotemporal patterns in regional SSTs with trend empirical orthogonal function (TEOF) analysis. The dominant TEOF mode reflects deglacial warming associated with rising pCO2. Tropical and subtropical SSTs correlated most strongly with this mode, suggesting that the thermodynamic response of the tropical eastern Pacific to greenhouse gas forcing was the dominant driver of regional SST change during deglaciation. The second TEOF mode reflects millennial-scale variability and is most strongly expressed in subpolar SSTs. The synchronous timing between North Pacific and North Atlantic SST oscillations is evidence for the rapid transmission of millennial-scale climate perturbations between the basins, likely through an atmospheric teleconnection. SSTs at NH8P have no correlation with either leading TEOF mode as there is minimal change in SST at this site after ~20 ka. A model simulation of the LGM indicates that glacial cooling was muted in much of the Eastern Pacific Warm Pool (EPWP), in which NH8P lies, due to reductions in latent heat flux. This suggests that the wind-evaporation-SST feedback was responsible for the attenuation of EPWP cooling. Overall, this study highlights the distinct latitudinal trends in the Pacific's response to deglaciation. #-------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: OCE-1651034, AGS-160230 #-------------------- # Funding_Agency # Funding_Agency_Name: Heising-Simons Foundation # Grant: 2016-015 #-------------------- # Site_Information # Site_Name: Site NH8P # Location: Eastern Pacific Ocean # Northernmost_Latitude: 22.5183 # Southernmost_Latitude: 22.5183 # Easternmost_Longitude: -106.5183 # Westernmost_Longitude: -106.5183 # Elevation_m: -1018 #-------------------- # Data_Collection # Collection_Name: Kumar2021UK37 # First_Year: 24336 # Last_Year: 1381 # Time_Unit: calendar year before present # Core_Length_m: 7.49 # Parameter_Keywords: geochemistry # Notes: #-------------------- # Chronology_Information # Chronology: Radiocarbon # Chronology_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/templates/noaa-wds-paleo-14c-terms.csv # Chronology_Download_Description: Radiocarbon terms and definitions. # Chronology_Notes: # Rejection_Rationale: # Reservoir_Method: # Calibration_Method: # Age_Model_Method: # Missing_Values: # Chronology_Table: # lab_code depth_cm material_dated age_14C_BP1950 age_14C_1s_yr delta_R_yr delta_R_uncert_yr calib_curve # NH8P-1 2 organic carbon 1971 53 215 18 Marine13 # NH8P-2 32 organic carbon 3592 69 215 18 Marine13 # NH8P-3 77 organic carbon 6889 74 215 18 Marine13 # NH8P-4 97 organic carbon 9136 89 215 18 Marine13 # NH8P-5 142 organic carbon 13752 169 215 18 Marine13 # NH8P-6 167 organic carbon 14079 182 215 18 Marine13 # NH8P-7 202 organic carbon 14960 189 215 18 Marine13 # NH8P-8 382 organic carbon 20120 221 215 18 Marine13 # NH8P-9 452 organic carbon 28778 287 215 18 Marine13 #-------------------- # 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. # # Variables format: Short_name what,material,error,units,seasonality,data_type,detail,method,data_format,additional_information # ## depth depth, , , centimeter, , paleoceanography, , ,N, ## age age, , , calendar year before present, , paleoceanography, , ,N, Median age ## UK'_37 alkenone unsaturation index Uk37 prime, sediment, , dimensionless, , paleoceanography, , chromatography,N, # #-------------------- # 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 age UK'_37 3 1381 0.851 9 1740 0.820 12 1946 0.794 18 2357 0.819 21 2576 0.753 26 2905 0.781 30 3131 0.802 36 3550 0.819 40 3907 0.820 45 4365 0.828 48 4632 0.814 51 4902 0.821 57 5457 0.819 60 5734 0.815 65 6195 0.829 70 6640 0.822 77 7206 0.815 81 7660 0.810 84 8027 0.826 86 8294 0.819 90 8805 0.833 96 9487 0.833 98 9714 0.841 101 10010 0.833 104 10344 0.814 108 10802 0.815 111 11168 0.808 114 11515 0.805 117 11862 0.810 120 12235 0.820 122 12488 0.818 124 12718 0.827 127 13079 0.829 129 13309 0.829 131 13545 0.822 134 13891 0.832 136 14124 0.832 140 14572 0.833 143 14858 0.841 146 15025 0.820 150 15241 0.825 153 15399 0.801 158 15650 0.829 163 15889 0.830 168 16126 0.815 173 16320 0.821 178 16520 0.818 184 16762 0.840 189 16967 0.843 195 17211 0.816 201 17450 0.818 206 17661 0.817 211 17879 0.825 217 18139 0.837 222 18364 0.831 227 18589 0.828 232 18809 0.836 238 19072 0.851 243 19301 0.851 249 19573 0.834 254 19797 0.824 259 20020 0.825 265 20283 0.836 270 20519 0.834 275 20749 0.848 280 20968 0.859 286 21241 0.789 291 21468 0.814 296 21686 0.785 300 21863 0.805 302 21949 0.804 307 22179 0.809 312 22408 0.790 317 22632 0.775 323 22906 0.776 328 23128 0.764 334 23398 0.773 339 23615 0.786 344 23844 0.801 350 24124 0.796 355 24336 0.786