NS/IOC/INF-17 (Continued ) 

 Descrip t ion and Pres entat ion of Pa t a 



(a) Sea-level records. These will be the mean monthly 

 sea levels computed from hourly observations from a 

 recording gauge or alternatively according to 

 standard observations on a tide staff. 



(b) Long Period Wave Records will be retained at the 

 appropriate Institutions and parts of them made 

 available on request together with relevant details 

 at cost of reproduction. Periods of observations 

 and the range of frequencies covered should be 

 reported for inclusion in WDC indexes, 



(c) Serial St?»tion Records 



(i) Depth as accurately as possible using suitable 

 standard depths, 



(ii) Temperature in ^C to + 0.01°. 



(iii) Salinity by accurate method to + 0.02 per cent. 



(iv) Concentrations of O2, Si04, PO4, NO2, NO3, 



H2S (if present), CO2, NH2, H3BO3, C14, D2O1, 



T2O, and other chemical species, pH, alkalinity 



and radioactivity. Whenever non-standard 

 methods of analysis are used, specifications 

 are to be given. 



(d) Colour and transparency. Data at selected stations 

 should be included with serial station records, 



(e) State of sea and swell. Visual observations and 

 averaged results of instrumental measurements of 

 height, period, and direction of waves, expressed Ir 

 the customary units. Full details of scales to be 

 furnished with tabulated results. 



(f) Currents. Observational data on currents along 

 sections and at anchor stations, at specified levels, 

 and with information about the method and circumstances 

 of measurement - e.g., ship behavior, etc^ 



