9. Barometric Pressure . Barometric pressure is coded in millibars, 

 neglecting the 900 or 1000. Thus, 996 millibars is coded as 96 and 1008 

 millibars is coded on 08. 



10. Air Temperature . Dry bulb and wet bulb temperatures are entered 

 to the nearest tenth of a degree (centigrade). A negative temperature is 

 coded by dropping the minus sign and adding 50; thus - 10* is coded as 60. 



11. Humidity . The percent of humidity is eoded directly, 100 percent 

 being eoded as 99« 



12. Weather . Weather is coded as indicated in Table II, Numerical 

 Weather Codes - Present Weather. 



13. Cloud . Cloud type and amount are coded as indicated in Table 

 III, Cloud Type, and IV, Cloud Amount. 



lU. Sea . Sea direction and amount are coded as indicated in Tables 

 I and V, respectively. 



15* Swell . Swell direction and amount are coded as indicated in 

 Table I and VI, respectively. 



lo ^ Visibility . Visibility is coded as indicated in Table VII, 

 Visibility. 



SUBSURFACE OBSERVATIONS 



1. Sample Depth . Observed (actual) depth of each sample is given 

 in meters. Interpolated values at standard depths are also given. The 

 standard depths, in meters are: 0, 10, 20, 30, 50, 100, 150, 200, 250, 

 300, ifOO, 500, 600, 800, 1000, 1200, 1500, 2500, 3000, and thence every 

 1000 meters. 



2. Temperature . The centigrade temperature is given in degrees 

 and hundredths. 



3. Salinity . Salinity is given in parts per thousand (by weight) 

 to two decimal places. 



h. Sigma-t . To convert to density divide by 1000 and add 1. Thus, 

 a sigma-t value of 22.35 converts to a density of 1.02235. 



5. Delta-D . The values in the columns are the anomalies of dynamic 

 depths from the surface to each level in dynamic meters. Each entry is 

 the cumulative sum of the anomalies of dynamic depth of the layer above. 

 These values have been computed for the standard depths only, and serve 

 to identify computed points. 



60 



