Published March 25, 2014 | Version v1
Poster Open

Air-Sea Gas Exchange and Momentum Transfer: Turbulence and Schmidt Number Dependency

  • 1. Institute for Environmental Physics, Heidelberg University, Germany
  • 2. Institute for Environmental Physics, Heidelberg University, Germany and Heidelberg Collaboratory for Image Processing, Heidelberg University, Germany


The exchange of trace gases across the air-sea boundary layer is characterized by the gas transfer velocity k = 1/β u* Sc-n,with the friction velocity u* (a measure for momentum input into the water), the tracers Schmidt number Sc, and the Schmidt number exponent n which changes gradually from n=2/3 for a smooth water surface, to n=1/2 for a rough and wavy surface. β denotes the momentum transfer resistance, a dimensionless scaling parameter. In recent years, many new insights into the transition of the Schmidt number exponent n from smooth to rough conditions were acquired in detailed lab studies, while there is a lack of studies focusing on β. Using experimental data from various wind-wave tank laboratories, we found that β, just like the Schmidt number exponent n, is not a constant but depends on the state of the water surface as well as the degree of contamination of the water surface with surface active material.



Files (2.6 MB)

Name Size Download all
2.6 MB Preview Download