<?xml version="1.0" encoding="UTF-8"?><!--*** Generated from internal PANGAEA metadata schema by dif.xslt ***--><DIF xsi:schemaLocation="http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/ http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/dif_v9.4.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/">
<Entry_ID>PANGAEA_996526</Entry_ID>
<Entry_Title>Concentrations of particulate organic carbon and nitrogen in second year sea ice during the MOSAiC expedition (PS122) in the Central Arctic Ocean 2019-2020</Entry_Title>
<Data_Set_Citation>
<Dataset_Creator>Hoppe, Clara Jule Marie; Lebreton, Benoit; Guillou, Gaël; Graeve, Martin; Stimpfle, Jasmin; Balmonte, John Paul; Castellani, Giulia; Chamberlain, Emelia; Creamean, Jessie; Droste, Elise Sayana; Eggers, Lena; Fong, Allison A; Gardner, Jessie; Heitmann, Laura; Lan, Musheng; Ren, Jian; Schmidt, Katrin; Snoeijs-Leijonmalm, Pauline; Spahic, Susanne; Svenson, Anders; Torstensson, Anders; Ulfsbo, Adam; Vortkamp, Martina; Zhuang, Yanpei</Dataset_Creator>
<Dataset_Title>Concentrations of particulate organic carbon and nitrogen in second year sea ice during the MOSAiC expedition (PS122) in the Central Arctic Ocean 2019-2020</Dataset_Title>
<Dataset_Release_Date>2026-08-17</Dataset_Release_Date>
<Dataset_Publisher>PANGAEA</Dataset_Publisher>
<Data_Presentation_Form>Dataset</Data_Presentation_Form>
<Online_Resource>https://doi.pangaea.de/10.1594/PANGAEA.996526</Online_Resource>
</Data_Set_Citation>
<Personnel>
<Role>Investigator</Role>
<First_Name>Clara Jule Marie</First_Name>
<Last_Name>Hoppe</Last_Name>
<Email>Clara.Hoppe@awi.de</Email>
</Personnel>
<Discipline>
<Discipline_Name>Earth Science</Discipline_Name>
</Discipline>
<Parameters>
<Detailed_Variable>Event label</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Date/Time of event</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Cruise/expedition</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Time in weeks</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>LATITUDE</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>LONGITUDE</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Device type</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Core section label</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Core section, comment</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Depth, ice/snow, bottom/maximum</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Carbon, organic, particulate</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Nitrogen, organic, particulate</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>δ13C, particulate organic carbon</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Comment</Detailed_Variable>
</Parameters>
<ISO_Topic_Category>geoscientificInformation</ISO_Topic_Category>
<Keyword>Arctic</Keyword>
<Keyword>C:N</Keyword>
<Keyword>Ice corer</Keyword>
<Keyword>MOSAiC_ECO</Keyword>
<Keyword>MOSAiC20192020</Keyword>
<Keyword>POC</Keyword>
<Keyword>PON</Keyword>
<Keyword>PS122/1</Keyword>
<Keyword>PS122/1_5-78</Keyword>
<Keyword>PS122/1_6-36</Keyword>
<Keyword>PS122/1_7-9</Keyword>
<Keyword>PS122/1_9-11</Keyword>
<Keyword>PS122/2</Keyword>
<Keyword>PS122/2_20-5</Keyword>
<Keyword>PS122/2_22-7</Keyword>
<Keyword>PS122/2_25-15</Keyword>
<Keyword>PS122/3</Keyword>
<Keyword>PS122/3_33-18</Keyword>
<Keyword>PS122/3_35-4</Keyword>
<Keyword>PS122/3_36-4</Keyword>
<Keyword>PS122/3_38-16</Keyword>
<Keyword>PS122/3_39-18</Keyword>
<Keyword>PS122/4</Keyword>
<Keyword>PS122/4_45-29</Keyword>
<Keyword>PS122/4_46-20</Keyword>
<Keyword>PS122/4_47-18</Keyword>
<Keyword>PS122/4_48-25</Keyword>
<Keyword>seaice</Keyword>
<Keyword>Sea ice</Keyword>
<Source_Name>
<Long_Name>Polarstern</Long_Name>
</Source_Name>
<Temporal_Coverage>
<Start_Date>2019-10-28</Start_Date>
<Stop_Date>2020-07-20</Stop_Date>
</Temporal_Coverage>
<Data_Set_Progress>Complete</Data_Set_Progress>
<Spatial_Coverage>
<Southernmost_Latitude>80.7709</Southernmost_Latitude>
<Northernmost_Latitude>88.0708</Northernmost_Latitude>
<Westernmost_Longitude>-0.485</Westernmost_Longitude>
<Easternmost_Longitude>126.3299</Easternmost_Longitude>
</Spatial_Coverage>
<Project>
<Short_Name>MOSAiC</Short_Name>
<Long_Name>Multidisciplinary drifting Observatory for the Study of Arctic Climate</Long_Name>
</Project>
<Access_Constraints>unrestricted</Access_Constraints>
<Use_Constraints>CC-BY-4.0: Creative Commons Attribution 4.0 International</Use_Constraints>
<Data_Set_Language>English</Data_Set_Language>
<Data_Center>
<Data_Center_Name>
<Short_Name>PANGAEA</Short_Name>
<Long_Name>Data Publisher for Earth &amp; Environmental Science</Long_Name>
</Data_Center_Name>
<Data_Center_URL>https://www.pangaea.de/</Data_Center_URL>
<Personnel>
<Role>Data Center Contact</Role>
<First_Name>Michael</First_Name>
<Last_Name>Diepenbroek</Last_Name>
<Email>info@pangaea.de</Email>
<Contact_Address>
<Address>Leobener Str.</Address>
<City>Bremen</City>
<Province_or_State>Bremen</Province_or_State>
<Postal_Code>28359</Postal_Code>
<Country>Germany</Country>
</Contact_Address>
</Personnel>
</Data_Center>
<Distribution>
<Distribution_Media>online</Distribution_Media>
<Distribution_Size>2776 data points</Distribution_Size>
<Distribution_Format>text/tab-separated-values</Distribution_Format>
</Distribution>
<Reference>Fong, Allison A; Hoppe, Clara Jule Marie; Aberle, Nicole; Ashjian, Carin J; Assmy, Philipp; Bai, Youcheng; Bakker, Dorothee C E; Balmonte, John Paul; Barry, Kevin R; Bertilsson, Stefan; Boulton, William; Bowman, Jeff S; Bozzato, Deborah; Bratbak, Gunnar; Buck, Moritz; Campbell, Robert G; Castellani, Giulia; Chamberlain, Emelia; Chen, Jianfang; Chierici, Melissa; Cornils, Astrid; Creamean, Jessie; Damm, Ellen; Dethloff, Klaus; Droste, Elise Sayana; Ebenhöh, Oliver; Eggers, Sarah Lena; Engel, Anja; Flores, Hauke; Fransson, Agneta; Frickenhaus, Stephan; Gardner, Jessie; Gelfman, Cecilia E; Granskog, Mats A; Graeve, Martin; Havermans, Charlotte; Heuzé, Céline; Hildebrandt, Nicole; Hill, Thomas C J; Hoppema, Mario; Immerz, Antonia; Jin, Haiyan; Koch, Boris P; Kong, Xianyu; Kraberg, Alexandra Claudia; Lan, Musheng; Lange, Benjamin Allen; Larsen, Aud; Lebreton, Benoit; Leu, Eva; Loose, Brice; Maslowski, Wieslaw; Mavis, Camille; Metfies, Katja; Mock, Thomas; Müller, Oliver; Nicolaus, Marcel; Niehoff, Barbara; Nomura, Daiki; Nöthig, Eva-Maria; Oggier, Marc; Oldenburg, Ellen; Olsen, Lasse Mørk; Peeken, Ilka; Perovich, Donald K; Popa, Ovidiu; Rabe, Benjamin; Ren, Jian; Rex, Markus; Rinke, Annette; Rokitta, Sebastian D; Rost, Björn; Sakinan, Serdar; Salganik, Evgenii; Schaafsma, Fokje L; Schäfer, Hendrik; Schmidt, Katrin; Shoemaker, Katyanne M; Shupe, Matthew D; Snoeijs-Leijonmalm, Pauline; Stefels, Jacqueline; Svenson, Anders; Tao, Ran; Torres-Valdés, Sinhué; Torstensson, Anders; Toseland, Andrew; Ulfsbo, Adam; van Leeuwe, Maria A; Vortkamp, Martina; Webb, Alison L; Zhuang, Yanpei; Gradinger, Rolf (2024): Overview of the MOSAiC expedition: Ecosystem. Elementa - Science of the Anthropocene, 12(1), 00135, https://doi.org/10.1525/elementa.2023.00135</Reference>
<Summary>Concentrations and stable isotopic composition of particulate organic carbon and nitrogen from sectioned ice cores taken from second year sea ice  during the MOSAiC (PS122) drift expedition in the central Arctic Ocean. Ice sections were pooled per depth layer, melted in filtered seawater, filtered onto precombusted GF/F filters (nominal pore size 0.7µm) and frozen at -20°C. All samples were freeze dried. Samples for measurements of δ13C values, %C and %N were acidified by contact with HCl fumes for 4 h in a vacuum-enclosed system to remove carbonates, while samples for N stable isotope analysis were analyzed raw. Samples were analyzed using a continuous flow isotope ratio mass spectrometer (Delta V Plus with a Conflo IV interface, Thermo Scientific) interfaced with an elemental analyser (EA Isolink, Thermo Scientific) at the Littoral, Environment and Societies Joint Research Unit stable isotope facility (CNRS - University of La Rochelle, France). Normalization was done using reference materials (USGS61 and USG63, US Geological Survey). Details on sampling and processing can be found in Fong et al. 2024 (doi: 10.1525/elementa.2023.00135). ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.996526"!</Summary>
<Related_URL>
<URL>http://en.wikipedia.org/wiki/ISO_6709</URL>
<Description>LATITUDE</Description>
</Related_URL>
<Related_URL>
<URL>http://en.wikipedia.org/wiki/ISO_6709</URL>
<Description>LONGITUDE</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.org/10.1525/elementa.2023.00135</URL>
<Description>Overview of the MOSAiC expedition: Ecosystem</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.org/10.17815/jlsrf-3-163</URL>
<Description>Polarstern</Description>
</Related_URL>
<Related_URL>
<URL>https://mosaic-expedition.org/</URL>
<Description>MOSAiC</Description>
</Related_URL>
<Related_URL>
<URL>https://www.awi.de/en/about-us/organisation/staff/single-view/clara-hoppe.html</URL>
</Related_URL>
<Metadata_Name>DIF</Metadata_Name>
<Metadata_Version>9.4</Metadata_Version>
<DIF_Creation_Date>2026-08-17</DIF_Creation_Date>
<Last_DIF_Revision_Date>2026-09-15</Last_DIF_Revision_Date>
</DIF>
