Chemistry Reference
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mixing (decreasing the skin-bulk temperature difference), and increasing
net heat flux density at the water surface (increasing the skin-bulk tem-
perature difference).
Fig. 6.
Mean surface temperature (left) and variance (right) of the imaged foot-
print during one run of a duration of 50 minutes
Fig. 7.
Estimates of the skin-bulk temperature based on latent heat flux switching
method and prediction of a fit assuming a surface renewal model
Given the net heat flux density at the water surface and the skin-bulk
temperature difference across the thermal sublayer the heat transfer velo-
city was estimated according to Eq. 1.1. From heat transfer coefficients,
gas transfer velocities were calculated using a Schmidt number of Sc = 600
(carbon dioxide at 20°C and Sc = 7 (heat at 20°C in Eq. 1.2). Figure 8
(left) shows the gas exchange rates in the Heidelberg wind wave facility
plotted versus wind speed. The results are in good agreement with previ-
ous mass balance method (Eichkorn 1997), (Kandelbinder 1994) deployed
