Explanation of Data 



GENERAL 



Each of the items appearing on the data pages is explained belowo 

 The vertical arrows shown in some of the column headings indicate the 

 location of decimal points. The presence of an asterisk to the left 

 of the data indicates that data as doubtfvil; hence, such data were 

 not used in the construction of the curve from which the interpolated 

 values (standard depth values) were derived. Observed values which 

 were obviously false were omitted, 



SURFACE OBSERVATIONS 



1. Cruise Number - This number is arbitrarily assigned. It 

 identifies the cruise and provides a means of sorting from the IBM 

 file all cards pertaining to that particular cruise. For Operation 

 DEEP FREEZE II, 1956-1957, cruise number OO56O was assigned to the 



USS ATKA (AGB-3), cruise number OO56I to the USS STATEN ISLAND (AGB-5), 

 cruise number OO562 to the USCGC NORTHIYIND (WAGB-282), and cruise 

 number 00563 to the USS GLACIER (AGB-4). 



2. Station Number - Stations are numbered consecutively, start- 

 ing with one, at the beginning of each cruise. Therefore, for a 

 complete identification of a particular station, both cruise and 

 station number are necessary, 



3. Date - Month and day are given in Arabic numerals. The last 

 three figures of the year are indicated. The hour is Greenwich Mean 

 Time and is that hour nearest to the start of the first cast, 



4. Latitude and Longitude - The position of the station is given 

 in degrees and minutes, 



5. Sonic Depth - Sonic Depth is the uncorrected sounding for the 

 station, recorded in meters. 



6. Maximum Sample Depth - The maximum depth from which a water 

 sample was obtained at the station is given to the nearest 100 meters, 



7. Wind - Wind speed is given in meters per second. Direction 

 from which the wind blows is coded in degrees true to the nearest ten 

 degrees. The last zero is omitted. North is 36 on this scale and 

 calm is 0, See Tables Defining Code Sumbols - I, Compass Direction 

 Conversion Tables for Wind, Sea, and Swell Directions. 



8. Anemometer Height - The height of the anemometer above the 

 waterline is given in meters. 



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