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Signals at scales associated with wave and platform motion are often apparent in ship-based turbulent flux measurements, but it has been uncertain whether this is due to measurement error or to wind-wave interactions. We show that the signal has a dependence on horizontal ship velocity and that removing the signal reduces the dependence of the momentum flux on the orientation of the ship to the wind. We conclude that the signal is a bias due to time-varying motion-dependent flow distortion.
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Articles | Volume 15, issue 18
Atmos. Chem. Phys., 15, 10619–10629, 2015
https://doi.org/10.5194/acp-15-10619-2015
Atmos. Chem. Phys., 15, 10619–10629, 2015
https://doi.org/10.5194/acp-15-10619-2015

Research article 25 Sep 2015

Research article | 25 Sep 2015

Motion-correlated flow distortion and wave-induced biases in air–sea flux measurements from ships

J. Prytherch et al.

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Cited articles

Bigorre, S. P., Weller, R. A., Edson, J. B., and Ware, J. D.: A Surface Mooring for Air–Sea Interaction Research in the Gulf Stream. Part II: Analysis of the Observations and Their Accuracies, J. Atmos. Oceanic Technol., 30, 450–469. https://doi.org/10.1175/JTECH-D-12-00078.1, 2013.
Blomquist, B. W., Huebert, B. J., Fairall, C. W., Bariteau, L., Edson, J. B., Hare, J. E., and McGillis, W. R.: Advances in air-sea CO2 flux measurement by eddy correlation, Bound.-Lay. Meteorol., 152, 245–276, https://doi.org/10.1007/s10546-014-9926-2, 2014.
Brooks, I. M.: Spatially Distributed Measurements of Platform Motion for the Correction of Ship-Based Turbulent Fluxes, J. Atmos. Ocean. Tech., 25, 2007–2017, https://doi.org/10.1175/2008JTECHA1086.1, 2008.
Brut, A., Butet, A., Durand, P., Caniaux, G., and Planton, S.: Air–sea exchanges in the equatorial area from the EQUALANT99 dataset: Bulk parameterizations of turbulent fluxes corrected for airflow distortion, Q. J. Roy. Meteorol. Soc., 131, 2497–2538, https://doi.org/10.1256/qj.03.185, 2005.
Businger, J. A.: A note on the Businger–Dyer profiles, Bound.-Lay. Meteorol., 42, 145–151, https://doi.org/10.1007/978-94-009-2935-7_11, 1988.
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Short summary
Signals at scales associated with wave and platform motion are often apparent in ship-based turbulent flux measurements, but it has been uncertain whether this is due to measurement error or to wind-wave interactions. We show that the signal has a dependence on horizontal ship velocity and that removing the signal reduces the dependence of the momentum flux on the orientation of the ship to the wind. We conclude that the signal is a bias due to time-varying motion-dependent flow distortion.
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