-18- 



Computation of the conversion of available potential energy 



Lorenz (1955) derived expressions for the generation 

 and conversion of zonal and eddy available potential energy 

 in the atmosphere. In the case of our data for the Gulf Stream, 

 it is only possible to compute the contribution of one of the many 

 analogous terms in the balance of available potential energy. 

 This term 



may be called the conversion by horizontal processes of available 

 potential energy of the meanders to available potential energy 

 of the mean flow. We suppose here that the available potential 

 energy is due entirely to the temperature distribution. 

 Also ( ) = average over all data of one cruise 



at a certain depth (i, e, average in time 

 and over x - coordinate) 

 ' = /^ z aJ^d replaces the difference 



between the dry adiabatic and actual 

 lapse rate in the atmospheric case, 

 fi =fo('~^~'')j where 1=3 x 10"^ deg"l 

 X = space coordinate along line at right 

 angles to the mean current (positive 

 if towards ocean) 



