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 08o 



lOo Air Temperattire - 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 hTanidity is coded directly, 100- 

 percent being coded as 99, 



12, Weather - Weather is coded as indicated under Tables Defining 

 Code Symbols - II, Numerical Weather Codes - Present Weather, 



13, Cloud - Cloud type and amount are coded as indicated under 

 Tables Defining Code Sjraibols - III, Cloud Type and IV, Cloud Amount, 



14, Sea - Sea direction and amount are coded as indicated tinder 

 Tables Defining Code Symbols - V, Sea Amotint. 



15, Swell - Swell direction and amount are coded as indicated 

 under Tables Defining Code Symbols - VI, Swell Amount. 



16, Visibility - Visibility is coded as indicated under Tables 

 Defining Code Symbols - VII, Visibility, 



17, Color - Water color is coded as percent yellow, 



18, Transparency - Vfeter transparency is coded as the depth of 

 visual disappearance of a white Secchi disc, recorded to the nearest 

 meter, 



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, 75, 

 100, 150, 200, 250, 300, 400, 500, 600, 800, 1000, 1200, 1500, 2000, 

 2500, 3000, and hence 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, 



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. 



5o Delta- D - The values in the colijmns 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 jraints, 



68 



