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MMB243N00

-N2O-

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Station Contributor(s) Method Data Period

Observation
 Frequency : Every 6 hours
 Method : GC-ECD
 Instrument : Perkin-Elmer Perkin-Elmer ƒ°1-ƒ°10 system
 Description : The outdoor air was drawn at 2.5 m above the ground surface into a gas sampling loop (2 ml).
A 95% Ar - 5% CH4 mixture was used as the carrier gas. The sample size was 2 ml. Dinitrogen oxide was separated on a 6 ft Porapak QS column at 35 ºC. A reference gas and a sample air were measured in series.


Calibration
 Scale : The mixing ratio of N2O in the reference air was determined by the method reported in Muramatsu et al.(1982).
 Description : The air, which was compressed into 50 l stainless steel container up to 7 kg/cm2 , was used as the reference.


Data Processing
 Unit : ppb
 Description : Only technically false values caused by malfunction of the equipment were removed.


Average Procedure
 Hourly :
 Daily :
 Monthly :


Flag
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in cooperation with the World Meteorological Organization