<?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_995430</Entry_ID>
<Entry_Title>Hydrochemistry at time series station Helgoland Roads, North Sea, in 2010</Entry_Title>
<Data_Set_Citation>
<Dataset_Creator>Kirstein, Inga Vanessa; Carstens, Kristine; Wiltshire, Karen Helen</Dataset_Creator>
<Dataset_Title>Hydrochemistry at time series station Helgoland Roads, North Sea, in 2010</Dataset_Title>
<Dataset_Release_Date>2026-06-15</Dataset_Release_Date>
<Dataset_Publisher>PANGAEA</Dataset_Publisher>
<Data_Presentation_Form>Dataset</Data_Presentation_Form>
<Online_Resource>https://doi.pangaea.de/10.1594/PANGAEA.995430</Online_Resource>
</Data_Set_Citation>
<Personnel>
<Role>Investigator</Role>
<First_Name>Inga Vanessa</First_Name>
<Last_Name>Kirstein</Last_Name>
<Email>inga.kirstein@awi.de</Email>
</Personnel>
<Discipline>
<Discipline_Name>Earth Science</Discipline_Name>
</Discipline>
<Parameters>
<Detailed_Variable>DATE/TIME</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>LATITUDE</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>LONGITUDE</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>DEPTH, water</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Location</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Depth of Secchi Disk</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Quality flag, Secchi Disk</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Temperature, water</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Quality flag, water temperature</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Analyst</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Salinity</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Quality flag, salinity</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Silicate</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Quality flag, silicate</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Phosphate</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Quality flag, phosphate</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Nitrite</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Quality flag, nitrite</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Nitrate</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Nitrate and Nitrite</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Quality flag, nitrate and nitrite</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Ammonium</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Quality flag, ammonium</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Nitrogen, inorganic, dissolved</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Condition</Detailed_Variable>
</Parameters>
<ISO_Topic_Category>geoscientificInformation</ISO_Topic_Category>
<Keyword>HelgolandRoads2010</Keyword>
<Keyword>Kabeltonne</Keyword>
<Keyword>LTER</Keyword>
<Keyword>LTER_HelgolandRoads</Keyword>
<Keyword>LTO</Keyword>
<Keyword>Monitoring</Keyword>
<Sensor_Name>
<Long_Name>Secchi disk</Long_Name>
</Sensor_Name>
<Sensor_Name>
<Long_Name>Argo quality control flags according to Thierry et al. (2022)</Long_Name>
</Sensor_Name>
<Sensor_Name>
<Long_Name>Reversing thermometer</Long_Name>
</Sensor_Name>
<Sensor_Name>
<Long_Name>Salinometer, Guildline Instruments, 8400B Autosal</Long_Name>
</Sensor_Name>
<Sensor_Name>
<Long_Name>Seawater analysis after Grasshoff et al. (1983)</Long_Name>
</Sensor_Name>
<Sensor_Name>
<Long_Name>Calculated (difference of (Nitrate and Nitrite) and Nitrite)</Long_Name>
</Sensor_Name>
<Sensor_Name>
<Long_Name>Calculated (sum of Nitrate, Nitrite, Ammonium)</Long_Name>
</Sensor_Name>
<Source_Name>
<Long_Name>Marine Station Helgoland</Long_Name>
</Source_Name>
<Temporal_Coverage>
<Start_Date>2010-01-04</Start_Date>
<Stop_Date>2010-12-30</Stop_Date>
</Temporal_Coverage>
<Data_Set_Progress>Complete</Data_Set_Progress>
<Spatial_Coverage>
<Southernmost_Latitude>54.18800000000009</Southernmost_Latitude>
<Northernmost_Latitude>54.18800000000009</Northernmost_Latitude>
<Westernmost_Longitude>7.900000000000033</Westernmost_Longitude>
<Easternmost_Longitude>7.900000000000033</Easternmost_Longitude>
<Minimum_Depth>0.5 m (DEPTH, water)</Minimum_Depth>
<Maximum_Depth>0.5 m (DEPTH, water)</Maximum_Depth>
</Spatial_Coverage>
<Project>
<Short_Name>LTO_HelgolandRoads</Short_Name>
<Long_Name>Helgoland Roads long-term observations</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>5528 data points</Distribution_Size>
<Distribution_Format>text/tab-separated-values</Distribution_Format>
</Distribution>
<Reference>Krüger, Karen; Francis, T Ben; Chafee, Meghan; Amann, Rudolf I; Glavina del Rio, Tijana; Teeling, Hanno (2019): North Sea spring phytoplankton bloom metagenome assemblies and metagenome assembled genomes (MAGs). European Nucleotide Archive (ENA), insdc:PRJEB28156</Reference>
<Reference>Teeling, Hanno; Fuchs, Bernhard M; Bennke, Christin M; Krüger, Karen; Chafee, Meghan; Kappelmann, Lennart; Reintjes, Greta; Waldmann, Jost; Quast, Christian; Glöckner, Frank Oliver; Lucas, Judith; Wichels, Antje; Gerdts, Gunnar; Wiltshire, Karen Helen; Amann, Rudolf I (2016): Recurring patterns in bacterioplankton dynamics during coastal spring algae blooms. eLife Sciences Publications Ltd., 1-29, https://doi.org/10.7554/eLife.11888</Reference>
<Reference>Wiltshire, Karen Helen (2011): Hydrochemistry at time series station Helgoland Roads, North Sea, in 2010 [dataset]. Alfred Wegener Institute - Biological Institute Helgoland, PANGAEA, https://doi.org/10.1594/PANGAEA.756613</Reference>
<Reference>Grasshoff, Klaus; Ehrhardt, M; Kremling, Klaus (1983): Methods of seawater analysis. Verlag Chemie, Weinheim, 419 pp, https://doi.org/10.1002/iroh.19850700232</Reference>
<Reference>Thierry, Carval; Keeley, Robert; Takatsuki, Yasushi; Yoshida, Takashi; Loch, Stephen; Schmid, Claudia; Goldsmith, Roger; Wong, Annie; McCreadie, Rebecca; Thresher, Ann; Tran, Anh (2022): Argo user's manual. Ifremer, https://doi.org/10.13155/29825</Reference>
<Summary>In 2010, the hydrochemistry of surface water was monitored at Helgoland Roads station on every workday, typically before 9 a.m. Temperature was measured on board immediately after sampling. Visibility was measured on board using a Secchi Disk. Salinity and dissolved inorganic nutrients were measured from a bucket sample in the laboratory. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.995430"!</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>http://en.wikipedia.org/wiki/ISO_8601</URL>
<Description>DATE/TIME</Description>
</Related_URL>
<Related_URL>
<URL>https://archimer.ifremer.fr/doc/00187/29825/</URL>
<Description>Argo quality control flags according to Thierry et al. (2022)</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.org/10.1002/iroh.19850700232</URL>
<Description>Methods of seawater analysis</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.org/10.1002/iroh.19850700232</URL>
<Description>Seawater analysis after Grasshoff et al. (1983)</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.org/10.13155/29825</URL>
<Description>Argo user's manual</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.org/10.7554/eLife.11888</URL>
<Description>Recurring patterns in bacterioplankton dynamics during coastal spring algae blooms</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.pangaea.de/10.1594/PANGAEA.756613</URL>
<Description>Hydrochemistry at time series station Helgoland Roads, North Sea, in 2010</Description>
</Related_URL>
<Related_URL>
<URL>https://en.wikipedia.org/wiki/Reversing_thermometer</URL>
<Description>Reversing thermometer</Description>
</Related_URL>
<Related_URL>
<URL>https://www.awi.de/en/about-us/sites/helgoland.html</URL>
<Description>Marine Station Helgoland</Description>
</Related_URL>
<Related_URL>
<URL>https://www.awi.de/en/science/long-term-observations/biology/north-sea.html</URL>
<Description>LTO_HelgolandRoads</Description>
</Related_URL>
<Related_URL>
<URL>https://www.ebi.ac.uk/ena/browser/view/PRJEB28156</URL>
<Description>North Sea spring phytoplankton bloom metagenome assemblies and metagenome assembled genomes (MAGs)</Description>
</Related_URL>
<Parent_DIF>PANGAEA_960375</Parent_DIF>
<Metadata_Name>DIF</Metadata_Name>
<Metadata_Version>9.4</Metadata_Version>
<DIF_Creation_Date>2026-06-15</DIF_Creation_Date>
<Last_DIF_Revision_Date>2026-06-17</Last_DIF_Revision_Date>
</DIF>
