11. Humidity . The percent of humidity is coded directly, 100 per- 

 cent 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, Visi- 

 bility. 



17. Water . Color is coded as indicated in Table 8, Water Color. 

 Transparency is coded in whole meters from observations taken with a white 

 Secchi disc (30 cm. dia.). 



C. Subsurface Observations 



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

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

 standard depths, in meters, are: 0, 10, 20, 30, 50, 75, 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. 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. 



6. Dissolved Oxygen. These values when given are in milliliters 

 per liter to two decimal places. Values of 10.00 or above rarely occur 

 and are coded as 9.99. 



7. Sound Velocity . Sound velocity is given in feet per second to 

 one decimal place, corrected to pressure at each depth. See footnote 1 



on page 48. 



98 



