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| 
Arrival Heights
-VOCs-
| Observation |
| Category |
: |
Air sampling observation |
| Situation |
: |
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| Time zone |
: |
Local time +12 |
| Sampling |
| Sampling height |
: |
|
| Description |
: |
flask |
| Sampling and analysis frequency |
: |
Typically 1-2 samples were collected each month. |
| Sampling environment |
: |
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| Description for sampling analysis |
: |
|
| Instrument and Analysis |
| Measurement method |
: |
Gas Chromatography (FID) |
| Current status and history of instrument |
: |
|
| Description of instrument |
: |
All samples were analysed in the NIWA laboratory at Greta Point, Wellington, New Zealand.
Flask samples were collected from Scott Base from 1990 to 1999. 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 |
: |
|
| 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).
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| Data Processing |
| Measurement unit |
: |
ppt |
| Data processing |
: |
|
| Processing for averaging |
: |
|
| Data flag |
: |
Sampling Conditions flag (0=not specified, 1=not baseline, 2=baseline) |
| Data remarks |
: |
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| Other Information |
| Scientific aim |
: |
|
| Reference |
: |
Clarkson et al., Atmospheric Environment, 31, 3763-3771, 1997. |
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| submitted by National Institute of Water & Atmospheric Research Ltd. |
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