No.8

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Pacific Ocean

-VOCs-

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Observation
Category : Air sampling observation
Situation : October 2000
Time zone : UTC


Sampling
Sampling height :
Description : flask
Sampling and analysis frequency : Sampling during 8 voyages across the Pacific Ocean between 1996 and 2000 (usually 2 yoyages each year). Samples were taken at approximately every 2 degrees of latitude.
Sampling environment :
Description for sampling analysis : Air samples of ~ 1 m3 STP were collected using a three-stage oil free compressor (RIX, Industries, Oakland, California). Samples were stored in high-pressure aluminium cylinders (Scott Specialty Gases, San Francisco, California). Some additional glass flask samples were also taken.


Instrument and Analysis
Measurement method : Gas Chromatography (FID)
Current status and history of instrument : GC system was based on a Varian 2740-20, with a two stage
cryogenic trapping and transfer system, similar to that described
for light hydrocarbon analysis by Greenberg et al. (1994). This system had a 0.08" i.d. 20 ft phenyl isocynate Porasil C column with 7 ml/min helium carrier used isothermally at 50C which provided good separation for C2 to C5.
Description of instrument :


Calibration
Current scale employed in the measurement :
Measurement calibration :
Scale and calibration(treasability) :


Data Processing
Measurement unit : ppt
Data processing :
Processing for averaging :

Data flag :
Data remarks :


Other Information
Scientific aim :
Reference : "Ethane and propane in the Southern marine troposhere" ,T. S. Clarkson and R. J. Martin, Atmospheric Environment Vol. 31, No. 22, pp. 3763-3771, 1997


submitted by National Institute of Water & Atmospheric Research Ltd.

The WDCGG is operated by the Japan Meteorological Agency
in collaboration with the World Meteorological Organization