# 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/kumar2021teof.txt # Data_Download_Description: NOAA Template File; Site NH8P Alkenone Unsaturation Index Principal Components # #-------------------- # 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: Kumar2021TEOF # First_Year: 15700 # Last_Year: 6925 # Time_Unit: calendar year before present # Core_Length_m: 7.49 # Parameter_Keywords: geochemistry # Notes: #-------------------- # Chronology_Information # Chronology: #-------------------- # 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 <tab> what,material,error,units,seasonality,data_type,detail,method,data_format,additional_information # ## age age, , , calendar year before present, , paleoceanography, , ,N, Median age ## PC1 principal component, alkenone unsaturation index, , dimensionless, , paleoceanography, , ,N, PC1; derived with trend empirical orthogonal function analysis ## PC1_1_sig_err principal component, alkenone unsaturation index, one standard deviation, dimensionless, , paleoceanography, , ,N, PC1; derived with trend empirical orthogonal function analysis ## PC1_2_sig_err principal component, alkenone unsaturation index, two standard deviations, dimensionless, , paleoceanography, , ,N, PC1; derived with trend empirical orthogonal function analysis ## PC2 principal component, alkenone unsaturation index, , dimensionless, , paleoceanography, , ,N, PC2; derived with trend empirical orthogonal function analysis ## PC2_1_sig_err principal component, alkenone unsaturation index, one standard deviation, dimensionless, , paleoceanography, , ,N, PC2; derived with trend empirical orthogonal function analysis ## PC2_2_sig_err principal component, alkenone unsaturation index, two standard deviations, dimensionless, , paleoceanography, , ,N, PC2; derived with trend empirical orthogonal function analysis # #-------------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: # age PC1 PC1_1_sig_err PC1_2_sig_err PC2 PC2_1_sig_err PC2_2_sig_err 6925 1.386 0.257 0.470 -0.486 1.144 1.879 7250 1.330 0.255 0.440 -0.366 0.904 1.492 7575 1.294 0.235 0.440 -0.296 0.781 1.340 7900 1.273 0.237 0.449 -0.096 0.581 0.999 8225 1.131 0.248 0.438 0.060 0.586 0.911 8550 1.052 0.231 0.390 0.115 0.546 0.921 8875 0.934 0.222 0.405 0.183 0.720 1.167 9200 0.790 0.232 0.435 0.337 0.966 1.518 9525 0.706 0.226 0.419 0.457 0.970 1.563 9850 0.651 0.255 0.432 0.428 1.013 1.690 10175 0.586 0.264 0.468 0.504 1.014 1.632 10500 0.533 0.266 0.472 0.287 0.787 1.275 10825 0.447 0.256 0.506 0.188 0.754 1.213 11150 0.311 0.312 0.536 0.611 1.107 1.899 11475 -0.085 0.308 0.508 -0.060 1.006 1.688 11800 -0.396 0.280 0.510 -0.384 1.018 1.629 12125 -0.577 0.263 0.484 -0.628 1.069 1.772 12450 -0.630 0.269 0.496 -0.708 1.112 1.825 12775 -0.631 0.281 0.507 -0.437 1.048 1.645 13100 -0.737 0.252 0.462 -0.041 0.713 1.176 13425 -0.915 0.224 0.403 0.223 0.597 0.993 13750 -0.970 0.227 0.414 0.347 0.664 1.164 14075 -0.896 0.254 0.446 0.244 0.692 1.231 14400 -0.975 0.279 0.523 0.228 0.727 1.187 14725 -1.127 0.272 0.493 0.207 0.742 1.231 15050 -1.363 0.291 0.504 -0.041 0.773 1.299 15375 -1.522 0.294 0.574 -0.383 0.864 1.481 15700 -1.611 0.293 0.531 -0.484 0.988 1.690