3. s density of sea water 

 $ = snow thickness in can., 

 y% = snow density, 

 v - wind velocity in m/sec, 

 T ■ air temperature in °CL, 

 C^ " specific heat of sea ice, 

 T^ - temperature of freezing in °C, 

 © = equivalent temperature in "CL, 

 C2 - specific heat of sea water, and o 



K ■ latent heat of crystallization of salt water ice 80 (l~ "c"L "\ 



The equivalent temperature is a resultant temperature which takes into 

 account the effects of (l) radiation, (2) convection, (3) evaporation 

 and condensation, (4) wind velocity, (5) humidity, (6) cloud cover, and 

 (7) insolation. It is defined by the following relation 



= T o +Z IT" < 22a ) 



c 



where ©= equivalent temperature in °C, 

 To= air temperature in °C, 



q = total heat exchange represented by the seven meteorological 

 factors enumerated above, 



OCj. = cc n + oc k , 



oc n = 5.23 x 10" 12 xT 3 , 



Cc k = 1.75 x v o ' 656 x 10" 4 , and 



v = wind velocity in m/sec. 



The total heat loss 3 is determined as the sum of the individual 

 heat exchanges as follows: 



radiation loss = 1.307 x 10" 12 x T Q 4 (0.255 + 0.322 x 10" ,069P °)(|. - c Q n ), 

 convection loss - 1.75 x v o 0, "^° x 10"^, 



evaporation-condensation = 145.4(e w - e a )w a / 1440, 

 insolation: taken from Meteorological Tables, 

 where 



p = vapor pressure in rabs., 



c Q = cloud coefficient defined as follows: 



.86 for Nb, St, and Sc, 



6 77 for Ac, and 



.20 for Cs., 

 n Q = cloud cover in tenths, 

 e a = vapor pressure in inches, 

 e w = 0.98 e a , and 

 w _ = wind velocity in knots. 



