170 EFFECTIVENESS OF THE COMMITTEE ON OCEANOGRAPHY 



(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 station 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 2 , Si0 4 , P0 4 , N0 2 , N0 3 , H 2 S (if present), C0 2 , NH 2 , H3BO3, C 14 , 

 D 2 0., T,0, and other chemical species, pH, alkalinity and radio-activity. 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 measure- 

 ments of height, period and direction of waves, expressed in 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 be- 

 haviour, etc. 



(g) Bottom sediments. A field description of each bottom sample in accordance with the specifica- 

 tions in USHO Publication No. 607, p. 155. 



(h) Bathymetry 



(i) The sounding at each station to be included with the data under (c). 



(ii) For echo soundings the system preferred is an overlay of the ship's track chart show- 

 ing all navigational fixes on a chart of scale about 1:400,000 (1: 250,000 to 1:600,000) 

 showing soundings as closely spaced as they can conveniently be written. If an overlay 

 cannot be furnished, tabulated soundings at an interval of not more than 2 1/2 miles 

 are desired. In either case, full details of the assumed speed of sound, corrections 

 (if any) to sounding for actual speed, and any corrections to frequency standard are to 

 be furnished. 



(iii) Original echograms will be handled similarly to long wave records. Para. (b). 



(i) Bathythermography. Tabulations of temperatures at standard depths as on Form IBM 

 8180850, with data on time, date and location. 



(j) Meteorology 



(i) Tabulated data for standard marine observations of air temperature, ocean surface 

 temperature, absolute or relative humidity, speed and direction of wind, barometric 

 pressure, cloud, visibility and other atmospheric phenomena, and precipitation. If 

 scales used are not explicit c.g.s. units, conversion tables should be furnished. 



(ii) Upper air data. Radiosonde observations of temperature, humidity and pressure using 

 WMO format. Speed and direction of wind with a description of method used. 



(iii) Actinometry. Daily observations of the total, direct, diffused and reflected radiation 

 carried out during daylight and the results of 24 hour observations of effective radia- 

 tion in selected situations. 



