(Supplement 1) Selected chemical composition of Icelandic river waters and bedrock age ...

• Main Authors: Oskarsdottir, Sigrídur Magnea, Gislason, Sigurdur Reynir, Snorrason, Arni, Halldorsdottir, Stefanía Gudrún, Gisladottir, Gudrún
• Format: Dataset
• Language: English
• Published: PANGAEA 2011
• Subjects: Event label; Latitude of event; Longitude of event; Station label; Age, mineral; Silicon dioxide; Alkalinity, total; Molybdenum; Fluorine; Nitrogen, inorganic, dissolved/Phosphorus, inorganic, dissolved ratio; Water sample; International Polar Year 2007-2008 IPY; International Polar Year; IPY
• Online Access: https://dx.doi.org/10.1594/pangaea.818182; https://doi.pangaea.de/10.1594/PANGAEA.818182

In this study we map the spatial distribution of selected dissolved constituents in Icelandic river waters using GIS methods to study and interpret the connection between river chemistry, bedrock, hydrology, vegetation and aquatic ecology. Five parameters were selected: alkalinity, SiO2, Mo, F and the dissolved inorganic nitrogen and dissolved inorganic phosphorus mole ratio (DIN/DIP). The highest concentrations were found in rivers draining young rocks within the volcanic rift zone and especially those draining active central volcanoes. However, several catchments on the margins of the rift zone also had high values for these parameters, due to geothermal influence or wetlands within their catchment area. The DIN/DIP mole ratio was higher than 16 in rivers draining old rocks, but lowest in rivers within the volcanic rift zone. Thus primary production in the rivers is limited by fixed dissolved nitrogen within the rift zone, but dissolved phosphorus in the old Tertiary catchments. Nitrogen fixation within ... : Positions approximate. Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150 ...