noaa-icecore-18676 eng; USA utf8 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information pointOfContact NOAA World Data Service for Paleoclimatology Data Center Contact 828-271-4800 303-497-6513 325 Broadway, E/NE31 Boulder CO 80305-3328 USA paleo@noaa.gov pointOfContact 2024-05-30 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) NOAA/WDS Paleoclimatology - Dome Fuji, Antarctica Core DF1 1-cm Electrical Conductivity Measurements (ECM) 2015-05-15 publication doi:10.25921/v667-1992 noaa-icecore-18676 NCEI DSI 1200_02 NCEI DSI 1200_01 Fujita, S. originator Fujita, S. author Azuma, N. originator Azuma, N. author Motoyama, H. originator Motoyama, H. author Kameda, T. originator Kameda, T. author Narita, H. originator Narita, H. author Fujii, Y. originator Fujii, Y. author Watanabe, O. originator Watanabe, O. 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 Ice Core. The data include parameters of ice cores with a geographic location of Antarctica. The time period coverage is from 341096 to 2530 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 temperature, precipitation, atmospheric trace gases, and other aspects of climate and environment derived from ice cores drilled on glaciers and ice caps around the world. 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 NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information pointOfContact NOAA World Data Service for Paleoclimatology Data Center Contact 828-271-4800 303-497-6513 325 Broadway, E/NE31 Boulder CO 80305-3328 USA paleo@noaa.gov pointOfContact https://www.ncei.noaa.gov/pub/data/paleo/webimages/pc-default-icecore.png Paleoclimatology - Ice Core PNG Earth Science > Climate Indicators > Paleoclimate Indicators > Ice Core Records Earth Science > Paleoclimate > Ice Core Records theme Global Change Master Directory (GCMD) Science Keywords 2025 revision 22 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian earth science > paleoclimate > ice cores earth science > paleoclimate > ice cores earth science > paleoclimate > ice cores earth science > paleoclimate > ice core > physical properties theme Global Change Master Directory (GCMD) Science Keywords 2025 revision 22 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian What: electrical conductivity; Material: bulk ice What: depth; Material: null What: electrical conductivity; Material: bulk ice theme Paleoenvironmental Standard Terms (PaST) Thesaurus NOAA National Centers for Environmental Information https://www.ncei.noaa.gov/products/paleoclimatology/paleoenvironmental-standard-terms-thesaurus PaST Thesaurus information publisher Continent > Antarctica > Dome Fuji > LATITUDE -77.32 > LONGITUDE 38.7 place DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2025 revision 22 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian otherRestrictions Cite as: Fujita, S.; Azuma, N.; Motoyama, H.; Kameda, T.; Narita, H.; Fujii, Y.; Watanabe, O. (2015-05-15): NOAA/WDS Paleoclimatology - Dome Fuji, Antarctica Core DF1 1-cm Electrical Conductivity Measurements (ECM). [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/v667-1992. 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. 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Electrical measurements from the 2503-m Dome F antarctic ice core 2002 publication Fujita, Shuji; Azuma, Nobuhiko; Motoyama, Hideaki; Kameda, Takao; Narita, Hideki; Fujii, Yoshiyuki; Watanabe, Okitsugu author Annals of Glaciology publisher https://doi.org/10.3189/172756402781816951 HTTPS Web Browser Associated Reference published 2002 Fujita, Shuji; Azuma, Nobuhiko; Motoyama, Hideaki; Kameda, Takao; Narita, Hideki; Fujii, Yoshiyuki; Watanabe, Okitsugu, 2002: Electrical measurements from the 2503-m Dome F antarctic ice core. Annals of Glaciology, 35, 313-320, 10.3189/172756402781816951 information crossReference sciencePaper eng; USA geoscientificInformation Date Range: 341096 cal yr BP to 2530 cal yr BP; 38.7 38.7 -77.32 -77.32 Study Coordinates -77.32 38.7 -339146 -580 STUDY NOTES: The climatic record from the 2503m Dome Fuji (Antarctica) ice core was analyzed using AC-ECM (AC electrical conductivity measurements). AC-ECM is a method to detect the complex admittance between electrodes dragged on the ice surface with mm-scale resolution and uses 1Vand 1MHz. The ratio of the real to imaginary part of the admittance is the AC loss factor (or loss tangent), which responds linearly to the amount of sulfuric acid and hydrogen ions. Dome Fuji ice was measured to be highly acidic, with background values of 2-7 micro M, and had 4500 major peaks with acidities of up to 90 micro M. Methods are as follows. After equilibrating for 1 day at the cold-room temperature at Dome F, all core sections, which were 93mm in diameter and about 1.7 m long, were cut parallel to their central axes into 60% and 40% portions by volume. The cut surfaces of the 60 % portions were further finished with a microtome knife to make fresh, smooth surfaces. Immediately after a surface was cut and finished, two AC-ECM electrodes were dragged along the surface with a 1 MHz frequency, 1 V signal. The entire ice core from depths of 112.65 to 2503.07m was covered by the measurements. However, quality of the measurement below 2251.4 m was not good. Thus, we publish here down to 2251.4 m. Although the signal was sampled every 2mm, we plot only 10mm running averages of the data to remove noise. The AC-ECM electrodes were manually dragged along the ice at about 1cm s^(-1). The AC-ECM system consists of two coaxial electrodes and an auto-balance bridge (HP model 4284A precision LCR meter). It measures the complex admittance Y= G+Bi, where G is the conductance and B is the susceptance, at the surface of ice using 1MHz to detect the high frequency-limit conductance of ice; here high-frequency limit means frequency well above the Debye dispersion only, and below the dispersions that exist above the microwave region. The electrodes were aligned perpendicular to the core axis and 15mm apart.The effective resolution of the electrodes approximately equaled the distance between the electrodes (15mm); based on a physical principle that the electrical field decreases inversely proportional to the distance from a given location to each electrode. Within this distance, about 65% of the lines of electrical force cross. Because the AC-ECM needs careful calibration of the auto-balance bridge, cable and electrodes, we calibrated the admittance to measurements on three reference materials: dry air, aluminum and Teflon. We found that insufficient calibration would double the estimated error in the AC loss factor. The AC conductance is proportional to the concentration of sulfuric acid and hydrogen ions. All of the measured data were converted to values equivalent to -25C. For details, please see Fujita et al.(2002). ABSTRACT SUPPLIED BY ORIGINATOR: The 320 kyr climatic record from the 2503 m Dome Fuji (Antarctica) ice core was analyzed using two electrical methods: AC-ECM and ECM (electrical conductivity measurements). AC-ECM is a method to detect the complex admittance between electrodes dragged on the ice surface with mm-scale resolution and uses 1V and 1MHz. The ratio of the real to imaginary part of the admittance is the AC loss factor, which responds linearly to the amount of sulfuric acid and hydrogen ions. Both the AC loss factor and the ECM current respond to acid, but the ECM signal tends to saturate at high acidities. Dome Fuji ice was measured to be highly acidic, with background values of 2-7 uM, and had >500 major peaks with acidities of up to 90 uM. This ice-core evidence and earlier snow-chemistry survey around the dome region indicates that Dome F may have a better connection to the stratosphere than have sites at lower altitude, which allows more stratospheric aerosol and gases to reach the snow surface. Acidity tends to be high in interglacial periods, but correlation between acidity and d18O is not straightforward. Electrical signals decreased and smoothed out with increasing depth; the diffusion coefficients deduced from this smoothing were 10-102 times greater than in solid ice. The ice core exhibited electromechanical effects and expelling effects from sulfate peaks. NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information distributor In most cases, electronic downloads of the data are free. 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Native Format(s) https://doi.org/10.25921/v667-1992 HTTPS Landing Page Metadata Landing Page NCEI landing page with general information and links to access the data. information https://www.ncei.noaa.gov/access/paleo-search/study/18676 HTTPS Web Browser NOAA Study Page Study page with data access information. search https://www.ncei.noaa.gov/products/paleoclimatology/ice-core HTTPS Information NCEI Ice Core Page General information for this data type. information https://www.ncei.noaa.gov/pub/data/paleo/icecore/antarctica/domefuji/df1ecm1cm.txt HTTPS Download NCEI Direct Download Direct download links for dataset files. download https://www.ncei.noaa.gov/pub/data/paleo/icecore/antarctica/domefuji/df1ac-ecm1cm.txt HTTPS Download NCEI Direct Download Direct download links for dataset files. download asNeeded This ISO metadata record was translated from DIF metadata using dif-9x-to-iso-19115-2.xsl Version: 2022-06-21