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Kromer, Bernd; Roether, Wolfgang (1983): Radium concentration in water samples from the Northeast Atlantic [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.604844, Supplement to: Kromer, B; Roether, W (1983): Field measurements of air-sea gas exchange by the radon deficit method during JASIN 1978 and FGGE 1979. Meteor Forschungsergebnisse, Deutsche Forschungsgemeinschaft, Reihe A/B Allgemeines, Physik und Chemie des Meeres, Gebrüder Bornträger, Berlin, Stuttgart, A/B24, 55-76

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Abstract:
We present field measurements of air-sea gas exchange by the radon deficit method that were carried out during JASIN 1978 (NE Atlantic) and FGGE 1979 (Equatorial Atlantic). Both experiments comprised repeated deficit measurements at fixed position over periods of days or longer, using a previously descibed precise and fast-acquiaition, automatic radon measuring system. The deficit time series exhibit variations that only partly reflect the expected changes in gas transfer. By evaluating averages over each time series we deduce the following gas transfer velocities (average wind velocity and water temperature in parentheses):
JASIN phase 1: 1.6 ± 0.8 m/d (at ~6 m/s, 13°C)
JASIN phase 2: 4.3 ± 1.2 m/d (at ~8 m/s, 13°C)
FGGE: 1.2 ± 0.4 m/d (at ~5 m/s, 28°C)
0.9 ± 0.4 m/d (at ~7 m/s, 28°C)
1.5 ± 0.4 m/d (at ~7 m/s, 28°C)
The large difference betwen the JASIN phase 2 and FGGE values despite quite similare average wind velocity becomes even larger when the values are, however, fully compatible with the range of gas transfer velocities observed in laboratory experiments and the conclusion is suggested that their difference is caused by the highly different wind variability in JASIN and FGGE. We conclude that in gas exchange parameterization it is not sufficinent to consider wind velocity only. A comparison of our observations with laboratory results outlines the range of variations of air-sea gas transfer velocities with wind velocity and sea state.
We also reformulate the radon deficit method, in the light of our observed deficit variations, to account explicitely for non-stationary and horizontal inhomogeneity in previous radon work introduces considerable uncertainty in deduced gas transfere velocity. We furthermore discuss the observational rewuirements that have to be met for an adequate exploitation of the radon deficit method, of which an observation area of minimum horizontal inhomogeneity and monitoring of the remaining inhomogeneities are thought to be the most stringent ones.
Coverage:
Median Latitude: 43.084444 * Median Longitude: -14.267472 * South-bound Latitude: -2.000000 * West-bound Longitude: -22.000000 * North-bound Latitude: 59.040000 * East-bound Longitude: 3.000000
Date/Time Start: 1978-07-06T00:00:00 * Date/Time End: 1981-09-01T00:00:00
Event(s):
M49_001 * Latitude: 57.000000 * Longitude: 3.000000 * Date/Time: 1978-07-06T00:00:00 * Location: North Sea * Campaign: M49 (JASIN 1978) * Basis: Meteor (1964) * Method/Device: Water sample (WS) * Comment: position questionable
M49_002 * Latitude: 59.000000 * Longitude: -12.500000 * Date/Time: 1978-08-01T00:00:00 * Location: North Atlantic * Campaign: M49 (JASIN 1978) * Basis: Meteor (1964) * Method/Device: Water sample (WS)
M49_005 * Latitude: 59.000000 * Longitude: -12.500000 * Date/Time: 1978-08-05T00:00:00 * Location: North Atlantic * Campaign: M49 (JASIN 1978) * Basis: Meteor (1964) * Method/Device: Water sample (WS)
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Kromer, B; Roether, W (1983): Radium226 concentrations of water samples at site M49_002 of the Northeast Atlantic (Table 7). https://doi.org/10.1594/PANGAEA.602544
  2. Kromer, B; Roether, W (1983): Radium226 concentrations of water samples at site M51_286 of the equatorial Atlantic (Table 9). https://doi.org/10.1594/PANGAEA.602547
  3. Kromer, B; Roether, W (1983): Radium226 concentrations of water samples at site PO_08_1978_1501 of the Northeast Atlantic (Table 7). https://doi.org/10.1594/PANGAEA.602545
  4. Kromer, B; Roether, W (1983): Radium226 concentrations of surface water samples of the Northeast Atlantic (Table 7). https://doi.org/10.1594/PANGAEA.602546