noaa-ocean-12197 eng; USA utf8 dataset Bauer, Bruce DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce +1 303-497-6280 +1 303-497-6513 325 Broadway, E/CC23 Boulder CO 80305-3328 USA paleo@noaa.gov pointOfContact 2018-12-11 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) NOAA/WDS Paleoclimatology - Eastern Equatorial Pacific 100KYr Alkenone SST Reconstructions 2011-09-26 publication noaa-ocean-12197 NCEI DSI 1200_01 Dubois, N. originator Dubois, N. author Kienast, M. originator Kienast, M. author Kienast, S.S. originator Kienast, S.S. author Normandeau, C. originator Normandeau, C. author Calvert, S.E. originator Calvert, S.E. author Herbert, T.D. originator Herbert, T.D. author Mix, A.C. originator Mix, A.C. author NOAA National Centers for Environmental Information publisher tableDigital This archived Paleoclimatology Study is available from the NOAA National Centers for Environmental Information (NCEI), under the World Data Service (WDS) for Paleoclimatology. The associated NCEI study type is Paleoceanography. The data include parameters of paleoceanography with a geographic location of Eastern Pacific Ocean. The time period coverage is from 101690 to 1070 in calendar years before present (BP). See metadata information for parameter and study location details. Please cite this study when using the data. Records of past climate and ocean circulation derived from marine sediments. Parameter keywords describe what was measured in this dataset. Additional summary information can be found in the abstracts of papers listed in the dataset citations. completed Bauer, Bruce DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce +1 303-497-6280 +1 303-497-6513 325 Broadway, E/CC23 Boulder CO 80305-3328 USA paleo@noaa.gov pointOfContact https://www.ncdc.noaa.gov/c/images/pc-default-ocean.png Paleoclimatology - Paleoceanography PNG Earth Science > Paleoclimate > Ocean/Lake Records Earth Science > Climate Indicators > Paleoclimate Indicators > Ocean/Lake Records theme Global Change Master Directory (GCMD) Science Keywords 2018 revision Version 8.6 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords HTTPS Web Browser Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > climate reconstructions|paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleocean > geochemistry theme Global Change Master Directory (GCMD) Science Keywords 2018 revision Version 8.6 Global Change Data Center, Science and Exploration Directorate, Goddard Space Flight Center (GSFC) National Aeronautics and Space Administration (NASA) https://earthdata.nasa.gov/about/gcmd/global-change-master-directory-gcmd-keywords HTTPS Web Browser Global Change Master Directory (GCMD) Keywords The information provided on this page seeks to define how the GCMD Keywords are structured, used and accessed. It also provides information on how users can participate in the further development of the keywords. information publisher Sea Surface Temperature Reconstruction biogeochemical cycles theme Ocean > Pacific Ocean > Eastern Pacific Ocean> ME0005A-27JC > LATITUDE -1.8533 > LONGITUDE -82.7867 Ocean > Pacific Ocean > Eastern Pacific Ocean> ME0005A-24JC > LATITUDE .021667 > LONGITUDE -86.463 Ocean > Pacific Ocean > North Pacific Ocean> TR163-19P > LATITUDE 2.27 > LONGITUDE -90.95 Ocean > Pacific Ocean > Eastern Pacific Ocean> TR163-31P > LATITUDE -3.62 > LONGITUDE -83.97 place otherRestrictions Cite as: Dubois, N.; Kienast, M.; Kienast, S.S.; Normandeau, C.; Calvert, S.E.; Herbert, T.D.; Mix, A.C. (2011-09-26): NOAA/WDS Paleoclimatology - Eastern Equatorial Pacific 100KYr Alkenone SST Reconstructions. [indicate subset used]. NOAA National Centers for Environmental Information. https://www.ncdc.noaa.gov/paleo/study/12197. Accessed [date]. otherRestrictions Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives. otherRestrictions Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose. otherRestrictions None otherRestrictions Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. eng; USA geoscientificInformation Date Range: 101690 cal yr BP to 1070 cal yr BP; -90.95 -82.7867 -3.62 2.27 -99740 880 STUDY NOTES: The data set contains alkenone-based SST estimates, bulk sediment d15N and Corg content from 4 cores from the eastern equatorial Pacific covering the late Quaternary, in addition to the opal record and the residual opal record (with variability >10 kyr removed) from ME0005A-24JC. The data from core ME0005A-24JC are presented against 2 age models: scenario 1 and scenario 2, as discussed in the original reference. Cores ME0005A-24JC, ME0005A-27JC and TR163-31P were analyzed for alkenone unsaturation at Dalhousie University following standard laboratory procedures detailed by Kienast et al. (2006). Sea-surface temperature estimates (UK'37 SST) were calculated from the ratio of the concentration of the di and triunsaturated alkenones, using the calibration of Prahl et al. (1988). The upper 500 cm of ME0005A-24JC were analyzed at WHOI following the same procedure and were previously published by Kienast et al. (2006). These data were shifted by +0.027 UK'37 units because of a laboratory offset determined from 10 replicate samples. Cores TR163-19P was analyzed at Brown University following similar laboratory procedures detailed in Herbert et al. (1998). Results from the last 25 kyr BP of cores ME0005A-27JC, TR163-19P and TR163-31P were previously published in Dubois et al. (2009). The sedimentary d15N composition of all cores was analyzed at UBC, Vancouver, following standard procedures. Total carbon was determined with an elemental analyzer. Inorganic (i.e., carbonate mineral) carbon was determined in a carbon dioxide coulometer. Organic carbon was estimated by subtracting inorganic from total carbon. Results for the last 35 kyr have been published by Kienast et al. (2006, 2007). Biogenic opal of core ME0005A-24JC (>510 cm) was determined colorimetrically following alkaline extraction of silica (Mortlock and Froelich, 1989). The upper 510 cm were analyzed at UBC following the same procedure and were previously published by Kienast et al. (2007). Age models for Marine Isotopic Stage 1 and 2 (MIS1 and MIS2, i.e. 0-25 kyr) in cores ME0005A-27JC, TR163-19P and TR163-31P were adopted as previously published (see Kienast et al., 2007). We present here an updated MIS1-2 age model of core ME0005A-24JC based on 4 radiocarbon dates on Neogloboquadrina dutertrei published by Kienast et al. (2007) and 2 additional dates on N. dutertrei published by Kusch et al. (2010). Radiocarbon ages were calibrated to calendar years using the software CALIB 6.0 (Stuiver and Reimer, 1993; deltaR = 167 ± 106 yr), and the MARINE09 calibration data set (Reimer et al., 2009). Note that the use of this new calibration data set (MARINE09) leads to small deviations (<600 yr) from the calendar ages published by Kienast et al. (2007) using the MARINE04 (Hughen et al., 2004) calibration data set. Because of the difficulty in dating sediments from the equatorial Pacific older than 50,000 yr, we created two different age models based on the hypotheses under investigation. Cores TR163-31P, TR163-19P and ME0005A-27JC were graphically correlated to ME0005A-24JC for the MIS3-4 interval using the software AnalySeries (Paillard et al., 1996). We based our correlation on a number of clear features in the d15N and opal records, making sure not to violate the MIS4 benthic d18O transitions. Finally, based on multiple geochemical proxies (not shown), we identify an ash layer at a depth of 9.8 m ME0005A-24JC, 4.31 m ME0005A-27JC, 3.10 m in TR163-19P and 6.61 m in TR163-31P, which we assume to be the Los Chocoyos Ash Layer. This Ash Layer was previously observed in the Gulf of Mexico and equatorial Pacific and has been dated to 84,000 yr BP on the basis of oxygen isotope stratigraphy, biostratigraphy and Pa-Th data (Drexler et al., 1980). ABSTRACT SUPPLIED BY ORIGINATOR: In this study, we use records of nitrogen isotope ratios (d15N), UK'37 temperature estimates, organic carbon and opal percentages from high-resolution sediment cores located in the eastern equatorial Pacific (EEP) to explore the mechanisms linking millennial-scale changes in low-latitude sea surface temperature, water column denitrification and surface productivity to the timing of northern or southern polar climate during the last 100,000 yr. Our results support a hypothesis that the Southern Hemisphere, and its connection to the low latitudes via shallow subsurface ocean circulation, has a primary influence on the biogeochemistry of the EEP. In addition, our results suggest that, during the last glacial stage, denitrification rates fluctuated on millennial timescales in response to water-column ventilation rather than upstream oxidant demand in intermediate-depth waters. However, due to the poor age constraints available for Marine Isotopic Stage (MIS) 3, the EEP sedimentary data presented here could support two conflicting mechanisms, one driven by enhanced intermediate overturning circulation in the Southern Ocean during Heinrich Events/Antarctic Warm Events, implying that subsurface flow rates control thermocline ventilation, and a second one consistent with more sluggish intermediate circulation during Antarctic Warm Events and giving a central role to the temperature control on oxygen solubility in Southern Ocean surface waters. 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Native Format(s) https://data.nodc.noaa.gov/cgi-bin/iso?id=noaa-ocean-12197 HTTPS Landing Page NCEI landing page for this dataset Dataset landing page with general information and links to access the data. information https://www.ncdc.noaa.gov/paleo/study/12197 HTTPS Web Browser NCEI Study Page Study page with dataset access information. search https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/paleoceanography HTTPS Information NCEI Paleoceanography Page General information for this data type. information https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dubois2011/dubois2011.xls HTTPS Download /contributions_by_author/dubois2011/dubois2011.xls Original Data and Full Metadata download https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dubois2011/dubois2011.txt HTTPS Download /contributions_by_author/dubois2011/dubois2011.txt Original Data and Full Metadata download asNeeded This metadata record was translated from DIF using dif-9x-to-iso-19115-2.xsl Version: 2018-10-25