Earth System Science Data Discussions www.earth-syst-sci-data-discuss.net 1866-3591 2 1 2009 10.5194/essdd-2-477-2009 http://www.earth-syst-sci-data-discuss.net/2/477/2009/ http://www.earth-syst-sci-data-discuss.net/2/477/2009/essdd-2-477-2009.html http://www.earth-syst-sci-data-discuss.net/2/477/2009/essdd-2-477-2009.pdf 477 492 2009-10-16 The Irminger Sea and the Iceland Sea time series measurements of sea water carbon and nutrient chemistry 1983–2006 J. Olafsson jon@hafro.is S. R. Olafsdottir A. Benoit-Cattin T. Takahashi Marine Research Institute, Skulagata 4, IS 121 Reykjavik, Iceland Institute of Earth Sciences, University of Iceland, Sturlugata 7, IS 101 Reykjavik, Iceland Lamont-Doherty Earth Institute, Palisades, NY 10964, USA This paper describes the ways and means of assembling and quality controling the Irminger Sea and Iceland Sea time-series biogeochemical data which are included in the CARINA data set. The Irminger Sea and the Iceland Sea are hydrographically different regions where measurements of sea water carbon and nutrient chemistry were started in 1983. The sampling is seasonal, four times a year. The carbon chemistry is studied with measurements of the partial pressure of carbon dioxide in seawater, <i>p</i>CO<sub>2</sub>, and total dissolved inorganic carbon, TCO<sub>2</sub>. The carbon chemistry data are for surface waters only until 1994 when water column sampling was initiated. Other measured parameters are salinity, dissolved oxygen and the inorganic nutrients nitrate, phosphate and silicate. Because of the CARINA criteria for secondary quality control, depth &gt;1500 m, the IRM-TS could not be included in the routine QC and the IS-TS only in a limited way. However, with the information provided here, the quality of the data can be assessed e.g. on the basis of the results obtained with the use of reference materials. 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