Card type OBS designates observed levels. STD indicates the values of this standard level were inter- 

 polated bv a modified 3-point LaGrange formula. 



Depth (m.) Depth to nearest meter. A postscript T indicates depth vias obtained thermometrically; 



Z indicates uncorrected "wire out" depth. Postscript Q indicates value was marked 

 doubtful bv 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 °/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 lO-^toobtainanomaly of dynamicdepth indynamic meters referencedtothe 



sea surface. 



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



O2 ml/1 Dissolved oxygen in milliliters per liter entered to hundredths. 



PO4 — P /ig-at/1 Inorganic phosphate in microgram-atoms per liter entered to hundredths. 



Total — P/xg-at/1 Total phosphorus in microgram-atoms per liter entered to hundredths. 



NO2 — N ;ag-at/l Nitrite-nitrogen in microgram-atoms per liter entered to hundredths. 



NO3 — N /xg-at/I Nitrate-nitrogen in microgram-atoms per liter entered to tenths. 



Si04— Si /xg-at/1. . Silicate-silicon in microgram-atoms per liter entered to whole units. 



pH Entered lo hundredths. 



97 



