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Grasshoff, Klaus; Johannssen, Jens (1978): On the fine structure of oxygen distribution in surface water layers in the area between Iceland and Faroe Islands [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.611462, Supplement to: Grasshoff, Klaus; Johansen, J (1978): Untersuchung über die Feinstruktur der Sauerstoffverteilung in oberflächennahen Schichten im Seegebiet zwischen Island und Färöer. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe A Allgemeines, Physik und Chemie des Meeres, Gebrüder Bornträger, Berlin, Stuttgart, A20, 109-120

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Abstract:
During the international "Overflow-Expedition'' 1973 on R.V. "Meteor" oxygen concentrations in surface layers were measured in order to determine the oxygen gradients within the first two meters and to add some informations to the mechanisms of oxygen exchange at the air-sea interface. These investigations may be interesting also with regard to longterm- observations of the oxygen distribution in the Atlantic, especially the problem of the A.O.U. (apparent oxygen utilization) determination.
To measure oxygen gradients a special sampler was built which is able to take water samples each 20 cm of the first 2 meters. These data were supplemented by further samples down to 150 m, taken by conventional water samplers, from which samples were also taken to measure N2/O2-relations. By comparing these relations with theoretical relations in air-saturated water the influence of biological production and consumption on the oxygen contents in water could be estimated. A simple glass apparatus was built to extract gas from the water samples, and hereafter the N2/O2-relations were determined by mass spectrometry.
Most distributions of the oxygen anomaly show a negative oxygen balance which varies largely, probably due to strong mixing processes in the Iceland-Faroe ridge area.
The distribution of surface oxygen saturation values are of two different types. The values of the stations 260, 262 and 270 stem from mixed water and show homogeneous supersaturations, as can be found instantly when whitecaps appear.
The values of 9 other stations are from water, sampled during calm periods which has been mixed and supersaturated before. They show a decreasing oxygen saturation towards the sea surface and often undersaturation in the upper decimeters up to 98 % and even 91 %. So at the air-sea interface even less initial oxygen saturation than 100 % can be found after supersaturation during heavy weather periods.
Coverage:
Median Latitude: 63.115833 * Median Longitude: -7.565278 * South-bound Latitude: 61.176667 * West-bound Longitude: -14.306667 * North-bound Latitude: 64.593333 * East-bound Longitude: 8.625000
Date/Time Start: 1973-09-05T21:30:00 * Date/Time End: 1973-09-20T22:00:00
Event(s):
M31_264 * Latitude: 63.573333 * Longitude: -9.215000 * Date/Time: 1973-09-05T21:30:00 * Elevation: -609.0 m * Location: Iceland-Faroe Ridge * Campaign: M31 (Overflow 73) * Basis: Meteor (1964) * Method/Device: Water sample (WS)
M31_266 * Latitude: 63.315000 * Longitude: -9.641667 * Date/Time: 1973-09-06T04:00:00 * Elevation: -478.0 m * Location: Iceland-Faroe Ridge * Campaign: M31 (Overflow 73) * Basis: Meteor (1964) * Method/Device: Water sample (WS)
M31_270 * Latitude: 62.800000 * Longitude: -10.405000 * Date/Time: 1973-09-06T16:00:00 * Elevation: -508.0 m * Location: Iceland-Faroe Ridge * Campaign: M31 (Overflow 73) * Basis: Meteor (1964) * Method/Device: Water sample (WS)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Grasshoff, K; Johannssen, J (1978): Oxygen anomaly of water samples at station M31_264 in the area between Iceland and Faroe Islands (Table 2). https://doi.org/10.1594/PANGAEA.611456
  2. Grasshoff, K; Johannssen, J (1978): Oxygen anomaly of water samples at station M31_266 in the area between Iceland and Faroe Islands (Table 2). https://doi.org/10.1594/PANGAEA.611457
  3. Grasshoff, K; Johannssen, J (1978): Oxygen anomaly of water samples at station M31_270 in the area between Iceland and Faroe Islands (Table 2). https://doi.org/10.1594/PANGAEA.611458
  4. Grasshoff, K; Johannssen, J (1978): Oxygen anomaly of water samples at station M31_283 in the area between Iceland and Faroe Islands (Table 2). https://doi.org/10.1594/PANGAEA.611459
  5. Grasshoff, K; Johannssen, J (1978): Oxygen anomaly of water samples at station M31_301 in the area between Iceland and Faroe Islands (Table 2). https://doi.org/10.1594/PANGAEA.611460
  6. Grasshoff, K; Johannssen, J (1978): Oxygen anomaly of water samples at station M31_419 in the area between Iceland and Faroe Islands (Table 2). https://doi.org/10.1594/PANGAEA.611461