Cloud code: 



Type Cloud type according to WMO Code 0500. 



Amount Cloud amount in eighths. Entry of the numeral 9 indicates cloud amount could not be 



estimated. 



Water : 



Color code Color according to Forel-Ule scale. 



Trans. Transparency in whole meters as determined by Secchi disc. 



Wind: 



Dir. Rounded to nearest multiple of 10 degrees. 



Speed or force If preceded by letter S, wind speed in knots; if preceded by letter F, wind force 



according to Beaufort scale. 



Barometer Barometric pressure given in tens, units and tenths of millibars. 



Air temp. C Air temperature to tenths of a degree Celsius. 



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 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 thermometrically; 



Z indicates uncoi-rected "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 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 dynamic depth 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. 



66 



