53 



the scatter being caused by the wind speed as can be very distinctly seen 

 in the stable region. Consequently, we would have 



3e/3zL = f^Ue^, 



"a^ 



(7) 



Finally, when looking at the results obtained from vertical profiles of 

 water vapor pressure (Figure 10) we recognize that a relation between 



Figure 10. Vertical differences in water vapor pressure e-iQ-e-, between 

 the 10 m and 1 m levels as a function of water vapor pressure difference 

 air-sea Ae . The results of two research trips are distinguished by 

 different symbols (open and full circles), (from Brock, 1963) 



gradient and difference air-sea apparently exists also here, but the 

 scatter is rather large, because - in addition to the humidity difference 

 air-sea - two other parameters - wind speed and stability - or dynamic and 

 convective turbulence - determine the moisture exchange occurring in the 

 boundary layer air-sea. In this case, we must write 



3e/3z) = f (Ae , u , A9 ) 

 (a 3 a a a 



(8) 



