International Arctic Buoy Programme (IABP)

Website: https://iabp.apl.uw.edu/
Daily updated level 1 data: https://iabp.apl.uw.edu/IABP_Table.html  

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Argo

Website: https://argo.ucsd.edu/  

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Euro-Argo ERIC - European contribution to the Argo programme

Website: https://www.euro-argo.eu/  

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The Norwegian Argo Infrastructure

Website: https://norargo.hi.no/  

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Argo Poland

Website: https://www.iopan.gda.pl/hydrodynamics/po/Argo/argo.html  

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Biogeochemical Argo

Website: https://biogeochemical-argo.org/index.php  

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MOSAiC

Website: https://mosaic-expedition.org/  

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Randolph Glacier Inventory (RGI)

Website: https://www.glims.org/RGI/  

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Arctic-HYCOS

Website: https://hydrohub.wmo.int/en/projects/Arctic-HYCOS  

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WMO Information System (WIS)

Website: https://public.wmo.int/en/wmo-information-system-wis  

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Global Atmosphere Watch (GAW) Programme

Website: https://public.wmo.int/en/programmes/global-atmosphere-watch-programme  

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European Plate Observing System (EPOS)

Website: https://www.epos-eu.org/
  Data: https://www.ics-c.epos-eu.org/