nerc.ac.uk

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

Prytherch, J.; Yelland, M.J.; Brooks, I.M.; Tupman, D.J.; Pascal, R.W.; Moat, B.I.; Norris, S.J.. 2015 Motion-correlated flow distortion and wave-induced biases in air–sea flux measurements from ships. Atmospheric Chemistry and Physics, 15 (18). 10619-10629. 10.5194/acp-15-10619-2015

Before downloading, please read NORA policies.
[img]
Preview
Text (Open Access paper)
acp-15-10619-2015.pdf - Published Version
Available under License Creative Commons Attribution.

Download (922kB) | Preview

Abstract/Summary

Direct measurements of the turbulent air–sea fluxes of momentum, heat, moisture and gases are often made using sensors mounted on ships. Ship-based turbulent wind measurements are corrected for platform motion using well established techniques, but biases at scales associated with wave and platform motion are often still apparent in the flux measurements. It has been uncertain whether this signal is due to time-varying distortion of the air flow over the platform or to wind–wave interactions impacting the turbulence. Methods for removing such motion-scale biases from scalar measurements have previously been published but their application to momentum flux measurements remains controversial. Here we show that the measured motion-scale bias has a dependence on the horizontal ship velocity and that a correction for it reduces the dependence of the measured momentum flux on the orientation of the ship to the wind. We conclude that the bias is due to experimental error and that time-varying motion-dependent flow distortion is the likely source.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.5194/acp-15-10619-2015
ISSN: 1680-7324
NORA Subject Terms: Marine Sciences
Date made live: 29 Sep 2015 13:35 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/511899

Actions (login required)

View Item View Item

Document Downloads

Downloads for past 30 days

Downloads per month over past year

More statistics for this item...