Notes Concerning the Tables . 



Cruise and station numbers : In the 

 following tables the station designation has 

 three terais. The first term is a serial 

 number applied to all cruises of ALASKA re- 

 gcirdless of locale. The second term applies 

 to the three basic cruise areas worked out 

 for the specific hydrographic studies in 

 cooperation with Texas A. and M. Department 

 of Oceanography. These areas were designated 

 A, B, and C. The numbers immediately pre- 

 ceding a given letter indicate serially the 

 cruises in that particular area. The third 

 term is the serial number of the station as 

 occupied on any given cruise. Thus Station 

 4-2A-29 was the twenth-ninth station occupied 

 on the second cruise in area "A". The first 

 term, 4, indicates that this was the fourth 

 cruise of ALASKA vrtiile she was stationed at 

 Galveston. 



There were a number of special cruises 

 not related to the basic plan for the study 

 of the Gulf of Mexico which were assigned 

 serial numbers in regular order. It is for 

 this reason that cruises 6, 7, and 9 do not 

 appear in these tables. 



Depth : 

 meters) . 



in meters (1 fathom = 1.8285 



Temperature : degrees Centigrade. 



Salinity : parts per thousand, con- 

 verted from chloride content according to 

 Knudsen's tables. 



temperature by the use of graphs or tables 

 (LaFond, 1951). 



Total phosphorus (Total PO4-P) ; 

 microgram- atoms per liter of phosphate 

 phosphorus. The final color imetric deter- 

 mination is made as phosphate phosphorus 

 after digestion. 



Inorganic phosphorus (Inorg. PO4-P) : 

 Inorganic phosphorus as phosphate phosphorus , 

 undigested samples, in microgram-atoms per 

 liter. 



Nitrate-nitrite (NO3-N) : Nitrate- 

 nitrite nitrogen in micrograim-atoms of 

 nitrogen per liter. 



Carbohydrates (Carb. Mg./l) ; As arabi- 

 nose equivalents in milligrams per liter. 

 The general term carbohydrates should be 

 used because there may be several pentoses 

 or hexoses involved. Arabinose is used as 

 a standard for comparison during the analyt- 

 ical process. Undoubtedly these carbohy- 

 drate materials are present in the form of 

 monosaccharides, oligosacchcirides, and 

 polysaccharides. 



Protein (Prot. Mg./l) : Given in terms 

 of tyrosine in milligrams per liter. The 

 tyrosine may represent any number of known 

 and unknown specific proteinaceous materials, 

 jmd is used as a standard because of the 

 adaptability of the analytical method to 

 sea water. 



Sigma-_t CO't): Derived from computed 

 relationships between density (Mass per unit 

 volume) and the specific volume of given sam- 

 ples of sea water in their places of origin 

 (in situ ), LaFond (1951). (J s , t , p = 1,000 



^^s t p ~ ^)' where ' = density, s = salin- 

 ity °/oo, t = temperature CO, and p = 

 pressure (decibars). This definition refers 

 to the density at the pressure at which the 

 sample was collected. The same expression 

 for pressure = (surface) is <7s t,o ~ 1,000 



( /'g t o " ^^" ^s t o ^^ commonly short- 

 ened to (Jt s^'l provides an index nu mb er for 

 the density of a given sample at the sea 

 surface and for a given salinity and tem- 

 perature. Thus a density (.pg t o^ °^ 



1.02567 is converted by definition to a (T x 

 of 25.67 [Ot = 1,000(1.02567 -1)]. Sigma-t 

 (CJt^)'^^'^ be~deterrained from salinity cind 



Table 3. — Water color (Forel scale) 



Code 



00 

 10 

 20 

 30 

 40 

 50 

 60 

 70 

 80 

 90 

 99 



Description 



Deep blue 

 Blue 



Green blue 

 Blue green 

 Green 



Light green 

 Yellowish green 

 Yellow green 

 Green yellow 

 Greenish yellow 

 Yellow 



14 



