Oskarsdottir, Sigrídur Magnea; Gislason, Sigurdur Reynir; Snorrason, Arni; Halldorsdottir, Stefanía Gudrún; Gisladottir, Gudrún (2011): (Supplement 1) Selected chemical composition of Icelandic river waters and bedrock age [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.818182, Supplement to: Oskarsdottir, SM et al. (2011): Spatial distribution of dissolved constituents in Icelandic river waters. Journal of Hydrology, 397(3-4), 175-190, https://doi.org/10.1016/j.jhydrol.2010.11.028
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Published: 2011 (exact date unknown) • DOI registered: 2013-09-16
Abstract:
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 the rift zone can be enhanced by high dissolved molybdenum concentrations in the vicinity of volcanoes.
The river catchments in this study were subdivided into several hydrological categories. Importantly, the variation in the hydrology of the catchments cannot alone explain the variation in dissolved constituents. The presence or absence of central volcanoes, young reactive rocks, geothermal systems and wetlands is important for the chemistry of the river waters. We used too many categories within several of the river catchments to be able to determine a statistically significant connection between the chem¬istry of the river waters and the hydrological categories. More data are needed from rivers draining one single hydrological category. The spatial dissolved constituent distribution clearly revealed the difference between the two extremes, the young rocks of the volcanic rift zone and the old Tertiary terrain.
Project(s):
Coverage:
Median Latitude: 64.656554 * Median Longitude: -18.730571 * South-bound Latitude: 63.420000 * West-bound Longitude: -23.170000 * North-bound Latitude: 66.174000 * East-bound Longitude: -14.000000
Event(s):
IS_A-Jokulsa (V144) * Latitude: 65.277000 * Longitude: -18.797000 * Location: Iceland * Method/Device: Water sample (WS)
IS_Asa-Eldvatn (V328) * Latitude: 63.643000 * Longitude: -18.338000 * Location: Iceland * Method/Device: Water sample (WS)
IS_Blanda (V54) * Latitude: 65.409000 * Longitude: -19.735000 * Location: Iceland * Method/Device: Water sample (WS)
Comment:
Positions approximate. Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Latitude of event | Latitude | ||||
| 3 | Longitude of event | Longitude | ||||
| 4 | Station label | Station | Oskarsdottir, Sigrídur Magnea | |||
| 5 | Age, mineral | Age mineral | Ma | Oskarsdottir, Sigrídur Magnea | wt age of bedrock | |
| 6 | Silicon dioxide | SiO2 | mol/kg | Oskarsdottir, Sigrídur Magnea | ||
| 7 | Alkalinity, total | AT | mmol(eq)/kg | Oskarsdottir, Sigrídur Magnea | unit meq/kg | |
| 8 | Molybdenum | Mo | nmol/kg | Oskarsdottir, Sigrídur Magnea | ||
| 9 | Fluorine | F | µmol/kg | Oskarsdottir, Sigrídur Magnea | ||
| 10 | Nitrogen, inorganic, dissolved/Phosphorus, inorganic, dissolved ratio | DIN/DIP | Oskarsdottir, Sigrídur Magnea | Calculated, ratio of molar masses |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
335 data points