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Volume 11, issue 1 | Copyright

Special issue: Air-sea flux climatology; progress and future prospects (BG/ACP/OS...

Ocean Sci., 11, 111-120, 2015
https://doi.org/10.5194/os-11-111-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 26 Jan 2015

Research article | 26 Jan 2015

Comparative heat and gas exchange measurements in the Heidelberg Aeolotron, a large annular wind-wave tank

L. Nagel1, K. E. Krall1, and B. Jähne1,2 L. Nagel et al.
  • 1Institute of Environmental Physics, University of Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany
  • 2Heidelberg Collaboratory for Image Processing, University of Heidelberg, Speyerer Straße 6, 69115 Heidelberg, Germany

Abstract. A comparative study of simultaneous heat and gas exchange measurements was performed in the large annular Heidelberg Air–Sea Interaction Facility, the Aeolotron, under homogeneous water surface conditions. The use of two gas tracers, N2O and C2HF5, resulted not only in gas transfer velocities, but also in the measurement of the Schmidt number exponent n with a precision of ±0.025. The original controlled flux, or active thermographic, technique proposed by Jähne et al. (1989) was applied by heating a large patch at the water surface to measure heat transfer velocities. Heating a large patch, the active thermography technique is laterally homogeneous, and problems of lateral transport effects are avoided. Using the measured Schmidt number exponents, the ratio of the scaled heat transfer velocities to the measured gas transfer velocities is 1.046 ± 0.040, a good agreement within the limits of experimental uncertainties. This indicates the possibility to scale heat transfer velocities measured by active thermography to gas transfer velocities, provided that the Schmidt number exponent is known and that the heated patch is large enough to reach the thermal equilibrium.

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A comparative study of simultaneous heat and gas exchange measurements was performed in the large annular Heidelberg Air-Sea Interaction Facility, the Aeolotron, under homogeneous water surface conditions, including the measurement of the Schmidt number exponent. Provided the Schmidt number exponent is known and that the heated patch is large enough to reach the thermal equilibrium, it is possible to scale heat transfer velocities measured by active thermography to gas transfer velocities.
A comparative study of simultaneous heat and gas exchange measurements was performed in the...
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