Barometer Barometric pressure given in 10, units and 



tenths of millibars. 



Air Temp. °C Air temperature to tenths of a degree centi- 

 grade. 



Vis. Code Visibility according to WMO Code 4300. 



No. obs. depths Number of observed levels associated with the 



station. 



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 indi- 

 cates the values at this standard level were 

 interpolated by a modified 3-point LaGrange 

 formula. 



Depth (m) Depth to nearest meter. A postscript T indi- 

 cates depth was obtained thermometrically ; 

 Z indicates uncorrected "wire out" depth. 

 Postscript Q indicates value was marked 

 doubtful by originator; P indicates value 

 was considered doubtful by NODC. Post- 

 scripts P and Q retain this meaning 

 throughout the following entries. 



T°C Temperature to hundredths of a degree Centi- 

 grade. 



S °/oo 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 



dynamic height in dynamic meters refer- 

 enced to the sea surface. 



Sound Velocity Sound velocity according to Wilson's formula 



entered to tenths of a meter per second. 



O2 ml/1 Dis.solved oxygen in milliliters per liter en- 

 tered to hundredths. 



POi-P ug-at/1 Inorganic phosphate in microgram-atoms per 



liter entered to hundredths. 



Total-P ug-at/1 Total phosphorus in microgram-atoms per 



liter entered to hundredths. 



NOj-N ug-at/1 Nitrite-nitrogen in microgram-atoms per liter 



entered to hundredths. 



NO3-N ug-at/1 Nitrite-nitrogen in microgram-atoms per liter 



entered to tenths. 



Si04-Si ug-at/1 Silicate-silicon in microgram-atoms per liter 



entered to whole units. 



CHL-A Chlorophyll- A (total pigment) in milligrams 



per cubic meter entered to hundredths. 



41 



