Messenger time Entered in hours and tenths of an hour GMT. For Nansen casts, indicates time of release 



of messenger applicable to the observational level. For STD casts, indicates the starting 



time of lowering the sensor. 

 Card type OBS designates observed levels. STD indicates the values at this standard level were interpolated 



by a modified 3-point LaGrange formula. 

 Depth (m) Depth to nearest meter. A postscript T indicates depth was obtained therometrically; Z indicates 



uncorrected "wire out" depth. Postscript Q indicates value was marked doubtful by originator; 



P indicates value was considered doubtful by NODC. Postscripts P and Q retain this meaning 



throughout the following entries. 



T °C Temperature to hundredths of a degree Celsius. 



S %o Salinity in parts-per-thousand. 



SIGMA-T Entered to hundredths. 



Specific-volume Multiply entry by 10 "' to obtain specific-volume anomaly in cubic centimeters per gram. 



SAD Dyn. M x 10^ Multiply entry by 10"^ to obtain anomaly of djmamic depth in dynamic meters referenced 



to the sea surface. 

 Sound Velocity Sound velocity according to Wilson's formula entered to tenths of a meter per second. 



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