Articles | Volume 20, issue 5
Nonlin. Processes Geophys., 20, 825–839, 2013

Special issue: Nonlinear processes of Air-Sea/Land interaction: from observations...

Nonlin. Processes Geophys., 20, 825–839, 2013

Research article 29 Oct 2013

Research article | 29 Oct 2013

Momentum and buoyancy transfer in atmospheric turbulent boundary layer over wavy water surface – Part 1: Harmonic wave

Yu. I. Troitskaya4,1, E. V. Ezhova4,1, and S. S. Zilitinkevich2,3,4,5,6 Yu. I. Troitskaya et al.
  • 1Institute of Applied Physics RAS, Nizhniy Novgorod, Russia
  • 2Finnish Meteorological Institute, Helsinki, Finland
  • 3Department of Physics, University of Helsinki, Helsinki, Finland
  • 4Department of Radiophysics, N.I. Lobachevski State University of Nizhniy Novgorod, Nizhniy Novgorod, Russia
  • 5Institute of Geography RAS, Moscow, Russia
  • 6Nansen Environmental and Remote Sensing Centre, Bergen, Norway

Abstract. The surface-drag and mass-transfer coefficients are determined within a self-consistent problem of wave-induced perturbations and mean fields of velocity and density in the air, using a quasi-linear model based on the Reynolds equations with down-gradient turbulence closure. Investigation of a harmonic wave propagating along the wind has disclosed that the surface drag is generally larger for shorter waves. This effect is more pronounced in the unstable and neutral stratification. The stable stratification suppresses turbulence, which leads to weakening of the momentum and mass transfer.