10. 



11. 



calm is 00. See table 1, "Compass 

 Direction Conversion Table for Wind, 

 Sea, and Swell Directions." 



Barometer . The 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. 



Air Temperature . Dry bulb and wet bulb 

 temperatures are entered to the nearest 

 tenth of a degree (centigrade). 



Humidity . The percent of humidity is 

 coded directly. 



Weather . Weather is coded as indicated 

 in table 2, "Numerical Weather Codes- 

 Present Weather." 



12. Clouds . Cloud type and amount are 

 coded as indicated in table 3, "Cloud 

 Type"; and table 4, "Cloud Amount." 



13. Sea . Sea direction and amount are 

 coded as indicated in table 5, "Sea 

 Amount"; and table 1. 



14. Swell . Swell directions and amount 

 are coded as indicated in table 6, 

 "Swell Amount"; and table 1. 



15. Visibility . Visibility is coded as 

 indicated in table 7, "Visibility." 



16. Water Transparency . Given as meters 

 to which a Secchi disc is visible. 



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, 

 700, 800, 1000, 1200, 1500, 2000, 2500, 

 3000, and thence every 1000 meters. 



2. Temperature . The centigrade tempera- 

 ture is given in degrees and hun- 

 dredths. 



3. Salinity . Salinity is given in parts 

 per thousand to two decimal places. 



4. Sigma-t . To convert to density divide 

 by 1000 and add 1. Thus, a sigma-t 



10. 



value of 22.35 converts to a density 

 of 1.02235. 



Dissolved Oxygen . These values are 

 given in milliliters per liter to two 

 decimal places. 



Total Phosphorus . Values are given in 

 microgram atoms per liter to the near- 

 est 0.1 of a unit. 



Inorganic Phosphate . Values are given 

 in microgram atoms per liter to the 

 nearest 0.1 of a unit. 



Nitrate-nitrite . These values are 

 given in microgram atoms per liter to 

 the nearest 0.5 of a unit. 



Carbohydrates (Arabinose) . These 

 values are given in terms of milligrams 

 per liter to the nearest 0.1 of a unit. 

 Collier et al. (1953) presented a tech- 

 nique for estimating certain elements 

 of the organic materials in sea water 

 which react to the test for carbohy- 

 drates. The carbohydrate values are 

 given as arabinose equivalents, and 

 are not necessarily the actual concen- 

 trations of carbohydrate substances. 



Proteins (Tyrosine) . These values are 

 given to the nearest 0.1 of a unit as 

 milligrams per liter of protein materi- 

 al in sea water, which reacts to the 

 test for tyrosine. 



Biological 



Plankton volumes (Gulf III and silk 

 half-meter nets) , table 8. The posi- 

 tion given is that at beginning of the 

 tow. The depth of the haul is given 

 from to the greatest depth reached. 

 The volumes as given are "wet volumes" 

 (procedures for determination were 

 given under methods in report for 

 cruise 1). Very few samples contained 

 large organisms such as jellyfish 

 (which were removed), so that the vol- 

 umes represent smaller organisms. 



Plankton volumes (Gulf IA High-speed 

 sampler) , table 9. The position given 

 is that at the center of the tow. All 

 tows were made at the surface. The 

 volumes as given are "wet volumes" 

 (procedures for determination were 



