noaa-ocean-12196 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 Opal Flux Data 2011-09-26 publication noaa-ocean-12196 NCEI DSI 1200_01 Dubois, N. originator Dubois, N. author Kienast, M. originator Kienast, M. author Kienast, S.S. originator Kienast, S.S. author Calvert, S.E. originator Calvert, S.E. author François, R. originator François, R. author Anderson, R.F. originator Anderson, R.F. 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 99850 to 0 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 > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > paleoceanography earth science > paleoclimate > 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 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> TR163-22P > LATITUDE .515 > LONGITUDE -92.3983 Ocean > Pacific Ocean > South Pacific Ocean> V19-30 > LATITUDE -3 > LONGITUDE -83 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.; Calvert, S.E.; François, R.; Anderson, R.F. (2011-09-26): NOAA/WDS Paleoclimatology - Eastern Equatorial Pacific 100KYr Opal Flux Data. [indicate subset used]. NOAA National Centers for Environmental Information. https://www.ncdc.noaa.gov/paleo/study/12196. 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: 99850 cal yr BP to 0 cal yr BP; -92.3983 -82.7867 -3.62 2.27 -97900 1950 STUDY NOTES: The data set contains compositional data (opal, CaCO3, Corg, lithogenic) and 230Th-normalized fluxes from 6 cores from the eastern equatorial Pacific covering the late Quaternary, in addition to relative changes in Brassicasterol content in core ME0005A-24JC. The age models for cores ME0005A-24JC, TR163-19P, TR163-22P, TR163-31P and V19-30 are adopted as previously published: ME0005A-24JC (Lyle et al., 2005; A. Mix, unpublished data, 2006); TR163-19P (Kienast et al., 2006); TR163-22P (Lea et al., 2006); TR163-31P (Kienast et al., 2006); V19-30 (Shackleton et al., 1983). The age model for core ME0005A-27JC is adopted as published (Kienast et al., 2007) for the last 35 kyr, while the oldest part is based on benthic d18O stratigraphy (A. Mix, unpublished data, 2006). Biogenic opal was determined colorimetrically following alkaline extraction of silica (Mortlock and Froelich, 1989). Biogenic opal values in cores TR163-19P and TR163-31P are taken from Kienast et al. (2006) and those of core V19-30 for the last 20 kyr B.P. are taken from Bradtmiller et al. (2006). Uranium (238U), thorium (232Th, 230Th) and protactinium (231Pa) concentrations were determined at the University of British Columbia (UBC), LDEO and the Woods Hole Oceanographic Institution (WHOI) by isotope dilution on an inductively coupled plasma mass spectrometer (ICP-MS) following total acid digestion of sediment samples equilibrated with 229Th and 236U spikes and anion resin column chemistry to separate the Pa and U/Th fraction (François et al., 2004). In the calculations of 230Thxs,0 and 231Paxs,0 we use a half life for 230Th of 75.69 kyr, a half life for 231Pa of 32.50 kyr and a A238Udet/A232Thdet ratio of 0.50. Radioisotope data for cores TR163-19P and TR163-31P are from Kienast et al. (2006), and those of core V19-30 for the last 20 kyr are from Bradtmiller et al. (2006). Data for the last 35 kyr B.P. for cores ME0005A-24JC and ME0005A-27JC are from Kienast et al. (2007). Carbonate (CaCO3) values were obtained from the coulometric CO2 determinations assuming no other carbonate-bearing phase was present. Total carbon was determined by flash combustion gas chromatography with CHN elemental analyzers. Organic carbon was estimated by subtracting carbonate from total carbon. The lithogenic fraction was estimated from the residual non-biogenic fraction of the sediment, after subtraction of opal, carbonate and organic matter, except for core V19-30, where it was calculated from 232Th, assuming a detrital source of all 232Th and an average 232Th dust content of 10 ppm (Taylor and McLennan, 1985). Changes in the relative concentration of brassicasterol in core ME0005A-24JC were determined by gas chromatography at Dalhousie University. Approximately 1 g of freeze-dried sediment was extracted using a Dionex Accelerated Solvent Extraction system (ASE200). These extracts were saponified using potassium hydroxide and purified through silica column chromatography. The purified extracts were then treated with bis(trimethylsilyl)trifluoroacetamide (BSTFA) to derive trimethyl silyl esters (TMS) before gas chromatographic analysis. Relative sterol distributions were determined by integration of the sterol peak area in the chromatogram, normalized to sample weight. We did not use recovery standards and thus the normalized brassicasterol chromatographic peak areas we report were not corrected for potential losses during the extraction process. ABSTRACT SUPPLIED BY ORIGINATOR: The clear predictions of the silicic acid leakage hypothesis (SALH) resulted in a number of studies of downcore opal records from the tropical Pacific. The original SALH predicts that unused silicic acid, due to Fe-driven changes in Si versus N limitation, escaped from the glacial Southern Ocean to equatorial upwelling regimes where it enhanced diatom productivity, thereby decreasing coccolith growth and lowering atmospheric CO2. In contrast to SALH predictions, however, sedimentary records from the eastern equatorial Pacific (EEP) do not show enhanced opal burial during the Last Glacial Maximum (LGM) but higher rates of opal burial during the deglaciation and marine isotopic stage 3 (MIS3). The peak in opal productivity during the deglaciation has been attributed to increased supply of nutrient-rich waters driven by stronger upwelling of deep water in the Southern Ocean at the end of last glacial period. The large peak in opal burial observed in a number of EEP cores during MIS3 was interpreted as evidence for Si leakage when Southern Ocean diatom productivity was limited by both low dust flux and extended sea ice. On the other hand, the paradoxical LGM decline in opal accumulation in the EEP was explained by enhanced dust input that lowered the diatom Si:C uptake ratio. Here we use a combination of molecular fingerprints of algal productivity and radioisotope tracers of sedimentation to revisit opal burial in the EEP, in particular during the MIS3 opal peak. An increase in algal productivity is not supported by the sedimentary concentration of brassicasterol, an organic molecule commonly found in diatoms, or by the ratio of (231Pa/230Th)xs,0, a proxy for opal export production. We therefore conclude that the large peak in opal burial during MIS3 reflects enhanced preservation of diatoms. Building on mechanisms invoked in previous studies, we hypothesize that opal burial in the EEP is controlled both by the physiological response of diatoms to low-latitude Fe inputs and by the high-latitude processes leading to silicic acid leakage. DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce Customer Engagement Branch 1-828-271-4800 1-828-271-4876 151 Patton Avenue Veach-Baley Federal Building, Room 468 Asheville NC 28801-5001 USA ncei.orders@noaa.gov https://www.ncei.noaa.gov HTTPS Web Browser NOAA National Centers for Environmental Information (NCEI) NCEI home page with information, data access and contact information. information 8:00 - 6:00 Eastern distributor In most cases, electronic downloads of the data are free, however fees may apply for data certifications, copies of analog materials, and data distribution on physical media. Native Format(s) https://data.nodc.noaa.gov/cgi-bin/iso?id=noaa-ocean-12196 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/12196 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/dubois2010/dubois2010.txt HTTPS Download /contributions_by_author/dubois2010/dubois2010.txt Original Data and Full Metadata download https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dubois2010/dubois2010.xls HTTPS Download /contributions_by_author/dubois2010/dubois2010.xls 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