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| 
Arrival Heights
-CO-
| Observation |
| Category |
: |
Air sampling observation |
| Situation |
: |
ongoing |
| Time zone |
: |
Local time +12 |
| Sampling |
| Sampling height |
: |
5 |
| Description |
: |
flask |
| Sampling and analysis frequency |
: |
10-30 per year |
| Sampling environment |
: |
|
| Description for sampling analysis |
: |
The samples are collected when the wind is coming from a direction other than from Scott Base or McMurdo station.
Dry whole air samples are collected in 30 L high pressure aluminium tanks. Air is sampled through a 10 m long 12.5 mm o.d. Dekabon tube attached to the Met mast. The air is pumped from the mast to the tanks using a RIX 5A-3E sweet air compressor and dried using a 1 L stainless steel trap containing 3 mm 13X molecular sieve pellets.
Air samples are also collected in 2 L light gauge stainless steel electropolished cans using a stainless steel metal bellows pump through a separate air line and dried with magnesium perchlorate.
|
| Instrument and Analysis |
| Measurement method |
: |
Gas Chromatography (other) |
| Current status and history of instrument |
: |
GC- RGD until December 2009
GC-CVAFS from December 2009
|
| Description of instrument |
: |
Hewlett Packard
HP5890
All samples are analysed in the NIWA laboratory at Greta Point, Wellington, New Zealand.
|
| Calibration |
| Current scale employed in the measurement |
: |
NOAA04 scale |
| Measurement calibration |
: |
CO concentration is determined by gas chromatography fitted with flame ionisation detection and compared against standards purchased from NOAA/ESRL CCL and were last recalibrated in 2010. |
| Scale and calibration(treasability) |
: |
NOAA04 scale |
| Data Processing |
| Measurement unit |
: |
ppb |
| Data processing |
: |
|
| Processing for averaging |
: |
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| Data flag |
: |
Data are flagged for offshore or onshore wind.
The hundredth digit - Sampling Conditions flag
=0: not specified
=1: not baseline
=2: baseline
The tenth digit - Collection / Storage flag [Not used yet]
=0: not specified
=1: suspect
The unit digit - Measurement flag [Not used yet]
=0: not specified
=1-9: calibration revision |
| 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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