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  • GEOTRACES  (3)
  • Arctic Ocean; ARK-XXIX/3; Barents Sea; Bottle number; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Freon-11 (trichorofluoromethane); Freon-113; Freon-12 (dichlorodifluoromethane); GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Latitude of event; Longitude of event; Polarstern; Pressure, water; PS94; PS94/004-1; PS94/018-3; PS94/032-2; PS94/040-1; PS94/040-3; PS94/046-4; PS94/050-1; PS94/050-4; PS94/050-6; PS94/054-2; PS94/058-1; PS94/058-3; PS94/058-5; PS94/062-1; PS94/064-1; PS94/068-1; PS94/069-4; PS94/069-5; PS94/072-1; PS94/074-1; PS94/076-1; PS94/080-1; PS94/081-2; PS94/081-5; PS94/081-7; PS94/085-1; PS94/089-1; PS94/096-2; PS94/096-7; PS94/101-2; PS94/101-5; PS94/101-7; PS94/101-9; Salinity; Sulfur hexafluoride, SF6; Temperature, water  (1)
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  • 1
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    Unknown
    PANGAEA
    In:  Lamont-Doherty Earth Observatory of Columbia University, New York
    Publication Date: 2024-05-02
    Description: Water samples for CFC and SF6 measurements were collected using a CTD/rosette sampling system. The CFC/SF6 sample was the first sample drawn from the rosette bottle. The samples were collected in 250 cc glass stoppered bottles through a PVC tube connected to the rosette bottle drain valve. Bubbles were cleared from the tube with water flowing and the tube was inserted to the bottom of the 250 cc glass bottle. The glass bottle was placed in a wide mouth plastic jar that extended above the opening of the glass bottle. The overflow water collected in the jar, filling and overflowing the jar and covering the glass bottle opening. The flow continued for 3 overflow volumes of the glass bottle (750 cc) and the glass stopper was then inserted underwater preventing air from being trapped in the sample. The bottle was then placed upside down in the jar, the jar was capped and the sample stored at 2°C in a refrigerator to prevent degassing. At the end of the cruise, the samples were packed in insulated boxes with cold packs to maintain the 2°C temperature and shipped by air freight to Lamont-Doherty Earth Observatory. The measurements were carried out at Lamont using a dual purge and trap system interfaced to a dual ECD (electron capture detector) HP6890 gas chromatograph. When a water sample is introduced into the system, it is split into two aliquots, a 20 cc aliquot for CFC measurement and a 180 cc aliquot for SF6 measurement. The aliquots are transferred to appropriately sized sparging chambers and stripped with ultra high purity nitrogen, which transports the extracted gases to cold traps (Unibeads-2s for CFCs, Carboxan-1000 for SF6) cooled to -80°C. The traps are then heated to 110°C for CFCs and 165°C for SF6 and flushed into the gas chromatograph where CFCs are separated with a Porasil-B pre-column and a Carbograph 1AC main column and SF6 is separated with a pre-column and main column of Molecular Sieve 5A. The gases are detected by the ECDs. The ECDs are calibrated by running gas standards with known concentrations of CFCs and SF6 prepared by Dr. John Bullister of NOAA/PMEL specifically for the CLIVAR Repeat Hydrography program. CFC concentrations are reported on the SIO98 calibration scale and SF6 concentrations on the SIO2005 calibration scale. Duplicate samples were collected and measured to provide a combined precision for sampling and measurement. The average differences from these duplicate measurements was the larger of 0.024 pmol/kg or 2.1% for CFC-11, 0.008 pmol/kg or 1.8% for CFC-12, 0.006 pmol/kg for CFC-113 and 0.046 fmol/kg or 4.3% for SF6.
    Keywords: Arctic Ocean; ARK-XXIX/3; Barents Sea; Bottle number; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Elevation of event; Event label; Freon-11 (trichorofluoromethane); Freon-113; Freon-12 (dichlorodifluoromethane); GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Latitude of event; Longitude of event; Polarstern; Pressure, water; PS94; PS94/004-1; PS94/018-3; PS94/032-2; PS94/040-1; PS94/040-3; PS94/046-4; PS94/050-1; PS94/050-4; PS94/050-6; PS94/054-2; PS94/058-1; PS94/058-3; PS94/058-5; PS94/062-1; PS94/064-1; PS94/068-1; PS94/069-4; PS94/069-5; PS94/072-1; PS94/074-1; PS94/076-1; PS94/080-1; PS94/081-2; PS94/081-5; PS94/081-7; PS94/085-1; PS94/089-1; PS94/096-2; PS94/096-7; PS94/101-2; PS94/101-5; PS94/101-7; PS94/101-9; Salinity; Sulfur hexafluoride, SF6; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 3228 data points
    Location Call Number Limitation Availability
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  • 2
    Publication Date: 2022-05-25
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Journal of Geophysical Research: Oceans 123 (2018): 4853-4873, doi:10.1029/2018JC013888.
    Description: The first full transarctic section of 228Ra in surface waters measured during GEOTRACES cruises PS94 and HLY1502 (2015) shows a consistent distribution with maximum activities in the transpolar drift. Activities in the central Arctic have increased from 2007 through 2011 to 2015. The increased 228Ra input is attributed to stronger wave action on shelves resulting from a longer ice‐free season. A concomitant decrease in the 228Th/228Ra ratio likely results from more rapid transit of surface waters depleted in 228Th by scavenging over the shelf. The 228Ra activities observed in intermediate waters (〈1,500 m) in the Amundsen Basin are explained by ventilation with shelf water on a time scale of about 15–18 years, in good agreement with estimates based on SF6 and 129I/236U. The 228Th excess below the mixed layer up to 1,500 m depth can complement 234Th and 210Po as tracers of export production, after correction for the inherent excess resulting from the similarity of 228Ra and 228Th decay times. We show with a Th/Ra profile model that the 228Th/228Ra ratio below 1,500 m is inappropriate for this purpose because it is a delicate balance between horizontal supply of 228Ra and vertical flux of particulate 228Th. The accumulation of 226Ra in the deep Makarov Basin is not associated with an accumulation of Ba and can therefore be attributed to supply from decay of 230Th in the bottom sediment. We estimate a ventilation time of 480 years for the deep Makarov‐Canada Basin, in good agreement with previous estimates using other tracers.
    Description: U.S. National Science Foundation Grant Numbers: OCE‐1458305, OCE‐1458424; US NSF Grant Number: OCE‐1433922
    Keywords: Radium‐228 ; Thorium‐228 ; Arctic Ocean ; Transpolar drift ; GEOTRACES
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Location Call Number Limitation Availability
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  • 3
    Publication Date: 2022-05-25
    Description: © The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Chemical Geology 493 (2018): 210-223, doi:10.1016/j.chemgeo.2018.05.040.
    Description: The GEOTRACES Intermediate Data Product 2017 (IDP2017) is the second publicly available data product of the international GEOTRACES programme, and contains data measured and quality controlled before the end of 2016. The IDP2017 includes data from the Atlantic, Pacific, Arctic, Southern and Indian oceans, with about twice the data volume of the previous IDP2014. For the first time, the IDP2017 contains data for a large suite of biogeochemical parameters as well as aerosol and rain data characterising atmospheric trace element and isotope (TEI) sources. The TEI data in the IDP2017 are quality controlled by careful assessment of intercalibration results and multi-laboratory data comparisons at crossover stations. The IDP2017 consists of two parts: (1) a compilation of digital data for more than 450 TEIs as well as standard hydrographic parameters, and (2) the eGEOTRACES Electronic Atlas providing an on-line atlas that includes more than 590 section plots and 130 animated 3D scenes. The digital data are provided in several formats, including ASCII, Excel spreadsheet, netCDF, and Ocean Data View collection. Users can download the full data packages or make their own custom selections with a new on-line data extraction service. In addition to the actual data values, the IDP2017 also contains data quality flags and 1-σ data error values where available. Quality flags and error values are useful for data filtering and for statistical analysis. Metadata about data originators, analytical methods and original publications related to the data are linked in an easily accessible way. The eGEOTRACES Electronic Atlas is the visual representation of the IDP2017 as section plots and rotating 3D scenes. The basin-wide 3D scenes combine data from many cruises and provide quick overviews of large-scale tracer distributions. These 3D scenes provide geographical and bathymetric context that is crucial for the interpretation and assessment of tracer plumes near ocean margins or along ridges. The IDP2017 is the result of a truly international effort involving 326 researchers from 25 countries. This publication provides the critical reference for unpublished data, as well as for studies that make use of a large cross-section of data from the IDP2017. This article is part of a special issue entitled: Conway GEOTRACES - edited by Tim M. Conway, Tristan Horner, Yves Plancherel, and Aridane G. González.
    Description: We gratefully acknowledge financial support by the Scientific Committee on Oceanic Research (SCOR) through grants from the U.S. National Science Foundation, including grants OCE-0608600, OCE-0938349, OCE-1243377, and OCE-1546580. Financial support was also provided by the UK Natural Environment Research Council (NERC), the Ministry of Earth Science of India, the Centre National de Recherche Scientifique, l'Université Paul Sabatier de Toulouse, the Observatoire Midi-Pyrénées Toulouse, the Universitat Autònoma de Barcelona, the Kiel Excellence Cluster The Future Ocean, the Swedish Museum of Natural History, The University of Tokyo, The University of British Columbia, The Royal Netherlands Institute for Sea Research, the GEOMAR-Helmholtz Centre for Ocean Research Kiel, and the Alfred Wegener Institute.
    Keywords: GEOTRACES ; Trace elements ; Isotopes ; Electronic atlas ; IDP2017
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Location Call Number Limitation Availability
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  • 4
    Publication Date: 2022-05-26
    Description: © The Author(s), 2015. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Marine Chemistry 177 (2015): 1-8, doi:10.1016/j.marchem.2015.04.005.
    Description: The GEOTRACES Intermediate Data Product 2014 (IDP2014) is the first publicly available data product of the international GEOTRACES programme, and contains data measured and quality controlled before the end of 2013. It consists of two parts: (1) a compilation of digital data for more than 200 trace elements and isotopes (TEIs) as well as classical hydrographic parameters, and (2) the eGEOTRACES Electronic Atlas providing a strongly inter-linked on-line atlas including more than 300 section plots and 90 animated 3D scenes. The IDP2014 covers the Atlantic, Arctic, and Indian oceans, exhibiting highest data density in the Atlantic. The TEI data in the IDP2014 are quality controlled by careful assessment of intercalibration results and multi-laboratory data comparisons at cross-over stations. The digital data are provided in several formats, including ASCII spreadsheet, Excel spreadsheet, netCDF, and Ocean Data View collection. In addition to the actual data values the IDP2014 also contains data quality flags and 1-σ data error values where available. Quality flags and error values are useful for data filtering. Metadata about data originators, analytical methods and original publications related to the data are linked to the data in an easily accessible way. The eGEOTRACES Electronic Atlas is the visual representation of the IDP2014 data providing section plots and a new kind of animated 3D scenes. The basin-wide 3D scenes allow for viewing of data from many cruises at the same time, thereby providing quick overviews of large-scale tracer distributions. In addition, the 3D scenes provide geographical and bathymetric context that is crucial for the interpretation and assessment of observed tracer plumes, as well as for making inferences about controlling processes.
    Description: We gratefully acknowledge financial support by the Scientific Committee on Oceanic Research (SCOR) through grants from the U.S. National Science Foundation, including grants OCE-0608600, OCE-0938349, and OCE-1243377. Financial support was also provided by the UK Natural Environment Research Council, the Ministry of Earth Science of India, the Centre National de Recherche Scientifique, l'Université Paul Sabatier de Toulouse, the Observatoire Midi-Pyrénées Toulouse, the Universitat Autònoma de Barcelona, the Kiel Excellence Cluster The Future Ocean, the Swedish Museum of Natural History, The University of Tokyo, The University of British Columbia, The Royal Netherlands Institute for Sea Research, the GEOMAR-Helmholtz Centre for Ocean Research Kiel, and the Alfred Wegener Institute.
    Keywords: GEOTRACES ; Trace elements ; Isotopes ; Electronic atlas
    Repository Name: Woods Hole Open Access Server
    Type: Article
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