Stoll MHC ,
Baar de HJW ,
Zemmelink HJ ,
Klaassen W ,
Gieskes WWC
100 p
in Dutch
2001
Toon Nederlands
English Abstract The sea to air flux of CO2 and the biogenic volatile
sulfur compound dimethylsulphide were assessed with the Relaxed Eddy
Accumulation (REA) and the Gradient Flux techniques from stationary and
moving platforms in the Atlantic and Pacific Oceans during the FAIRS and
GasEx cruise. The correlation between the techniques was good, with REA on
average higher than GF. Fluxes derived from micrometeorological
measurements agreed within error bars with those obtained by the
conventional equations as proposed by Liss and Merlivat (1986), Wanninkhof
(1992), and Jacobs (1999). The relationships between the transfer velocity
and wind speed based on the micrometeorological measurements agreed within
10% and were on average higher than the equation proposed by Wanninkhof
(1992). The effect of temperature on the computed sea to air flux of CO2
were investigated on a micrometeorological scale as well as on a small scale
(top few metres of the watercolumn). The definition of skin temperature
relies on a known bulk temperature of the water, which is shown to be not
only highly stratified in the thermal structure but also very resilient
versus disturbances, being wind speed. The skin temperature models, which
were derived from open ocean work, are not directly applicable to coastal
seas. As the skin temperature and the thermal structure is so rigid under
the various wind conditions the gas exchange coefficients, derived from
windtunnel experiments under the assumption of a well mixed layer are now
under scrutiny.
