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 

 as 08. 



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

 nearest tenth of a degree Celsius (°C). A negative temperature Is coded by drop- 

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



n. Humidity . The percent of humidity is coded directly, 100 percent being 

 coded as 99. 



12. Weather . Weather is coded as indicated in Table 2, Numerical Weather 

 Codes ~ Present Weather , 



13. Cloud . Cloud type and amount are coded as indicated in Tables 3, Cloud 

 Type, and 4, Cloud Amount . 



14. Sea ■ Sea direction and amount are coded as indicated in Tables 1 and 5, 

 respectively. 



15. Swell , Swell direction and amount are coded as indicated in Tables 1 and 

 6, respectively. 



16. Visibility . Visibility is coded as indicated In Table 7, Visibility, 



C . Subsurface Observations 



K 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, 15, 100, 150, 200, 250, 300, 400, 500, 600, 800, 

 1000, 1200, 1500, 2000, 2500, 3000, and thence every 1000 meters. 



2. Temperature . The Celsius ("C) temperature Is given In degrees and hundredths, 



3. Salinity . Salinity Is given in parts per thousand (by weight) to two decimal 

 places . 



4. 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. Deltg-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. 



48 



