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Baring Head
-VOCs-
| Observation |
| Category |
: |
Air sampling observation |
| Situation |
: |
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| Time zone |
: |
Local time +12 |
| Sampling |
| Sampling height |
: |
10 |
| Description |
: |
flask |
| Sampling and analysis frequency |
: |
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| Sampling environment |
: |
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| Description for sampling analysis |
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| Instrument and Analysis |
| Measurement method |
: |
Gas Chromatography (FID) |
| Current status and history of instrument |
: |
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| Description of instrument |
: |
Flask samples were collected from Baring Head from 1993 to 2000. The flask samples were analysed on a GC system based on a Varian 2740-20, with a two stage cryogenic trapping and transfer system. For more details see Clarkson et al., Atmospheric Environment, 31, 3763-3771, 1997. |
| Calibration |
| Current scale employed in the measurement |
: |
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| Measurement calibration |
: |
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| 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).
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| Data Processing |
| Measurement unit |
: |
ppt |
| Data processing |
: |
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| Processing for averaging |
: |
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| 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 |
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| Other Information |
| Scientific aim |
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| Reference |
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| submitted by National Institute of Water & Atmospheric Research Ltd. |
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