The function of the various card types in these decks is as follows; 



A. DATA INPUT DECK 



1. Master Card (Card Type l) - This card is used to identify 

 each oceanographic station and to record general surface 

 environmental information obtained at the station. 



2. Observed Depth Card (Card Type 3) - This card is punched 

 for each depth at which physical and/ or chemical data are 

 reported. 



3. Literature Observed Depth Card (Card Type ^4-) - For some 

 published historical data, the original observed data are 

 no longer available; only the originator's interpolated 

 values are available. This card serves as an Observed 

 Depth Card in the computer system; interpolations and 

 computations are based on data in this card. 



B. CRUISE ARCHIVE DECK 



1. Master Card (Card Type l) - This card serves the same function 

 and contains the same information as the Master Card in the 

 Data Input Deck; however, the Master Card in the Cruise 

 Archive Deck contains the Marsden square number computed from 

 the positional information. 



2. Observed Depth Cards (Card Types 3 and k) - In addition to 

 the observed and/or literature interpolated data, these cards 

 contain the computed values of sigma-t (^t) and sound velocity. 



3. Standard Depth Cards (Card Types 6 and 7) - 



a. NODC-Froduced Standard Depth Card - Card Type 6 is the 

 NODC-produced Standard Depth Card which generally con- 

 tains the interpolated values of temperature, salinity, 

 and oxygen and the NODC computed values of sigma-t ('^t), 

 sound velocity, specific volume anomaly, and dynamic 

 depth anomaly. 



b. Originator's Standard Depth Card - Card Tjrpe 7 is the 

 Originator's Standard Depth Card which contains the 

 originator's interpolated values of temperature, salinity, 

 and oxygen. 



A Standard Depth Card is produced for each standard depth 

 that occurs above the last valid observed depth and for 

 each observed depth that coincides with a standard depth. 

 Standard depths for which NODC interpolates are: 



