No.8

Introduction
Data Policy
Data
Documentation
Contact Information



Baring Head

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Observation
Category : Air sampling observation
Situation :
Time zone : Local time +12


Sampling
Sampling height : 10
Description : continuous
Sampling and analysis frequency :
Sampling environment :
Description for sampling analysis :


Instrument and Analysis
Measurement method : Gas Chromatography (FID)
Current status and history of instrument :
Description of instrument : An automatic air sampling and gas chromatograph system was established at Baring Head from December 1991 to September 1993. It was based on a Siemans Sichromat with cryogenic sample trapping by liquid nitrogen. The system is described in detail in Clarkson et al., Atmospheric Environment 30, 569-577, 1996, and in Clarkson et al., Atmospheric Environment, 31, 3763-3771, 1997.


Calibration
Current scale employed in the measurement :
Measurement calibration :
Scale and calibration(treasability) : Calibration has been by comparisons with reference mixtures containing about 30 NMHCs in ppb amounts. To establish a reliable and stable calibration, several air samples were exchanged between NIWA and KFA Julich. Local working standards were prepared from mixtures of light hydrocarbons supplied by BOC Gases in New Zealand and NIST in the United States. The lab also participated in the international intercomparison exercise for NMHCs, NOMHICE (Apel et al., J.Geophys. Res., 99, 16651-16664, 1994).


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

Data flag : Data are flagged for offshore or onshore wind. Flag = 2 indicates onshore winds, Flag = 1 indicates off shore winds, Flag = 0 indicates not specified.
Also, the flag of “000” for the benzene and toluene data means “valid data”.
Data remarks :


Other Information
Scientific aim :
Reference :


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