<?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_995155</Entry_ID>
<Entry_Title>Seawater carbonate chemistry and the effect of silicate- and calcium-based ocean alkalinity enhancement on diatom silicification</Entry_Title>
<Data_Set_Citation>
<Dataset_Creator>Ferderer, Aaron; Schulz, Kai Georg; Riebesell, Ulf; Baker, Kirralee G; Chase, Zanna; Bach, Lennart Thomas</Dataset_Creator>
<Dataset_Title>Seawater carbonate chemistry and the effect of silicate- and calcium-based ocean alkalinity enhancement on diatom silicification</Dataset_Title>
<Dataset_Release_Date>2026-05-28</Dataset_Release_Date>
<Dataset_Publisher>PANGAEA</Dataset_Publisher>
<Data_Presentation_Form>Dataset</Data_Presentation_Form>
<Online_Resource>https://doi.pangaea.de/10.1594/PANGAEA.995155</Online_Resource>
</Data_Set_Citation>
<Personnel>
<Role>Investigator</Role>
<First_Name>Aaron</First_Name>
<Last_Name>Ferderer</Last_Name>
<Email>aaron.ferderer@gmail.com</Email>
</Personnel>
<Personnel>
<Role>Investigator</Role>
<First_Name>Julieta</First_Name>
<Last_Name>Schneider</Last_Name>
<Email>jschneider@geomar.de</Email>
</Personnel>
<Personnel>
<Role>Investigator</Role>
<First_Name>Yan</First_Name>
<Last_Name>Yang</Last_Name>
<Email>yangyan@xmu.edu.cn</Email>
</Personnel>
<Discipline>
<Discipline_Name>Earth Science</Discipline_Name>
</Discipline>
<Parameters>
<Detailed_Variable>Event label</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Type of study</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Day of experiment</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Mesocosm label</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Alkalinity, total</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Treatment</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Volume</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Biogenic silica</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Silicate</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Nitrate</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Nitrite</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Phosphate</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Phosphate, standard deviation</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Nitrate, standard deviation</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Nitrite, standard deviation</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Genus</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Area</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Fluorescence</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Incubation duration</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Phase</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Salinity</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Temperature, water</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>pH, total scale</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Carbon, inorganic, dissolved</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Calcite saturation state</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Aragonite saturation state</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Bicarbonate ion</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Carbon dioxide</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Carbonate system computation flag</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Fugacity of carbon dioxide (water) at sea surface temperature (wet air)</Detailed_Variable>
</Parameters>
<Parameters>
<Detailed_Variable>Carbonate ion</Detailed_Variable>
</Parameters>
<ISO_Topic_Category>geoscientificInformation</ISO_Topic_Category>
<Keyword>Coast and continental shelf</Keyword>
<Keyword>Community composition and diversity</Keyword>
<Keyword>Entire community</Keyword>
<Keyword>KOSMOS_2022</Keyword>
<Keyword>KOSMOS_2022_Mesocosm-M1</Keyword>
<Keyword>KOSMOS_2022_Mesocosm-M10</Keyword>
<Keyword>KOSMOS_2022_Mesocosm-M2</Keyword>
<Keyword>KOSMOS_2022_Mesocosm-M3</Keyword>
<Keyword>KOSMOS_2022_Mesocosm-M4</Keyword>
<Keyword>KOSMOS_2022_Mesocosm-M5</Keyword>
<Keyword>KOSMOS_2022_Mesocosm-M6</Keyword>
<Keyword>KOSMOS_2022_Mesocosm-M7</Keyword>
<Keyword>KOSMOS_2022_Mesocosm-M8</Keyword>
<Keyword>KOSMOS_2022_Mesocosm-M9</Keyword>
<Keyword>Laboratory experiment</Keyword>
<Keyword>Mesocosm experiment</Keyword>
<Keyword>Mesocosm or benthocosm</Keyword>
<Keyword>North Atlantic</Keyword>
<Keyword>Other studied parameter or process</Keyword>
<Keyword>Pelagos</Keyword>
<Keyword>Temperate</Keyword>
<Sensor_Name>
<Long_Name>Potentiometric titration</Long_Name>
</Sensor_Name>
<Sensor_Name>
<Long_Name>Potentiometric</Long_Name>
</Sensor_Name>
<Sensor_Name>
<Long_Name>Calculated using CO2SYS</Long_Name>
</Sensor_Name>
<Sensor_Name>
<Long_Name>Calculated using seacarb after Nisumaa et al. (2010)</Long_Name>
</Sensor_Name>
<Temporal_Coverage>
<Start_Date>2022-05-13</Start_Date>
<Stop_Date>2022-07-07</Stop_Date>
</Temporal_Coverage>
<Data_Set_Progress>Complete</Data_Set_Progress>
<Spatial_Coverage>
<Southernmost_Latitude>60.265278</Southernmost_Latitude>
<Northernmost_Latitude>60.265278</Northernmost_Latitude>
<Westernmost_Longitude>5.205832999999999</Westernmost_Longitude>
<Easternmost_Longitude>5.205832999999999</Easternmost_Longitude>
</Spatial_Coverage>
<Project>
<Short_Name>OA-ICC</Short_Name>
<Long_Name>Ocean Acidification International Coordination Centre</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>158874 data points</Distribution_Size>
<Distribution_Format>text/tab-separated-values</Distribution_Format>
</Distribution>
<Reference>Ferderer, Aaron; Schulz, Kai Georg; Riebesell, Ulf; Baker, Kirralee G; Chase, Zanna; Bach, Lennart Thomas (2024): Investigating the effect of silicate- and calcium-based ocean alkalinity enhancement on diatom silicification. Biogeosciences, 21(11), 2777-2794, https://doi.org/10.5194/bg-21-2777-2024</Reference>
<Reference>Schneider, Julieta; Riebesell, Ulf; Moras, Charly; Marín-Samper, Laura; Kittu, Leila; Ortiz Cortes, Joaquin; Schulz, Kai Georg (2025): KOSMOS 2022 Bergen mesocosm study on ocean alkalinity enhancement: carbonate chemistry , CO2 flux data and calcification estimates [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.983061</Reference>
<Reference>Ferderer, Aaron (2023): Investigating the effect of silicate- and calcium-based ocean alkalinity enhancement on diatom silicification - data [dataset]. Institute for Marine and Antarctic Studies, https://doi.org/10.25959/G3FN-HE45</Reference>
<Reference>Nisumaa, Anne-Marin; Pesant, Stephane; Bellerby, Richard G J; Delille, Bruno; Middelburg, Jack J; Orr, James C; Riebesell, Ulf; Tyrrell, Toby; Wolf-Gladrow, Dieter A; Gattuso, Jean-Pierre (2010): EPOCA/EUR-OCEANS data compilation on the biological and biogeochemical responses to ocean acidification. Earth System Science Data, 2(2), 167-175, https://doi.org/10.5194/essd-2-167-2010</Reference>
<Reference>Yang, Yan; Brockmann, Patrick; Galdino, Carolina; Schindler, Uwe; Gazeau, Frédéric (2024): An update of data compilation on the biological response to ocean acidification and overview of the OA-ICC data portal. Earth System Science Data, 16(8), 3771-3780, https://doi.org/10.5194/essd-16-3771-2024</Reference>
<Reference>Yang, Yan; Hansson, L; Gattuso, Jean-Pierre (2016): Data compilation on the biological response to ocean acidification: an update. Earth System Science Data, 8(1), 79-87, https://doi.org/10.5194/essd-8-79-2016</Reference>
<Reference>Gattuso, Jean-Pierre; Epitalon, Jean-Marie; Lavigne, Héloïse; Orr, James; Gentili, Bernard; Hagens, Mathilde; Hofmann, Andreas; Mueller, Jens-Daniel; Proye, Aurélien; Rae, James; Soetaert, Karline (2024): seacarb: seawater carbonate chemistry with R. R package version 3.3.3. https://cran.r-project.org/web/packages/seacarb/index.html</Reference>
<Summary>These files contain the data recorded from a mesocosm experiment conducted in Bergen, Norway 2022 which assessed the effect of simualted mineral-based (silicate or calcium) ocean alkalinity enhancement (OAE) on diatom silicification. Ten mesocosms were used in total, divided into two groups either the silicate- or calcium based group and alkalinity was increased by either 0, 150, 300, 450 or 600 µmol L-1 above natrually occuring levels. The PDMPO-fluorescence (an appropriate proxy for silicification) of diatoms was recorded on eight seperate days during the experiment. Accompanying data includes measured; macronutrients (nitrate, nitrite, phophate, silicate), total alkalinity, biogenic silica in the water column and sediment trap.
This dataset is included in the OA-ICC data compilation maintained in the framework of the IAEA Ocean Acidification International Coordination Centre (see https://oa-icc.ipsl.fr). Original data were downloaded from the Institute for Marine and Antarctic Studies (IMAS) (see Source). In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2024) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation by seacarb is 2026-05-28. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.995155"!</Summary>
<Related_URL>
<URL>http://en.wikipedia.org/wiki/Volume</URL>
<Description>Volume</Description>
</Related_URL>
<Related_URL>
<URL>http://invabio.wdc-mare.org/mesocubi.jpg</URL>
<Description>Mesocosm experiment</Description>
</Related_URL>
<Related_URL>
<URL>http://mel.xmu.edu.cn/en/</URL>
</Related_URL>
<Related_URL>
<URL>https://cran.r-project.org/web/packages/seacarb/index.html</URL>
<Description>seacarb: seawater carbonate chemistry with R. R package version 3.3.3</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.org/10.25959/G3FN-HE45</URL>
<Description>Investigating the effect of silicate- and calcium-based ocean alkalinity enhancement on diatom silicification - data</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.org/10.5194/bg-21-2777-2024</URL>
<Description>Investigating the effect of silicate- and calcium-based ocean alkalinity enhancement on diatom silicification</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.org/10.5194/essd-16-3771-2024</URL>
<Description>An update of data compilation on the biological response to ocean acidification and overview of the OA-ICC data portal</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.org/10.5194/essd-2-167-2010</URL>
<Description>Calculated using seacarb after Nisumaa et al. (2010)</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.org/10.5194/essd-2-167-2010</URL>
<Description>EPOCA/EUR-OCEANS data compilation on the biological and biogeochemical responses to ocean acidification</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.org/10.5194/essd-8-79-2016</URL>
<Description>Data compilation on the biological response to ocean acidification: an update</Description>
</Related_URL>
<Related_URL>
<URL>https://doi.pangaea.de/10.1594/PANGAEA.983061</URL>
<Description>KOSMOS 2022 Bergen mesocosm study on ocean alkalinity enhancement: carbonate chemistry , CO2 flux data and calcification estimates</Description>
</Related_URL>
<Related_URL>
<URL>https://en.wikipedia.org/wiki/Genus</URL>
<Description>Genus</Description>
</Related_URL>
<Related_URL>
<URL>https://www.iaea.org/services/oa-icc/science-and-collaboration/data-access-and-management</URL>
<Description>OA-ICC</Description>
</Related_URL>
<Metadata_Name>DIF</Metadata_Name>
<Metadata_Version>9.4</Metadata_Version>
<DIF_Creation_Date>2026-05-28</DIF_Creation_Date>
<Last_DIF_Revision_Date>2026-05-28</Last_DIF_Revision_Date>
</DIF>
