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Lac La Biche (Alberta)
-CO-
| Observation |
| Category |
: |
Air sampling observation |
| Situation |
: |
|
| Time zone |
: |
UTC |
| Sampling |
| Sampling height |
: |
|
| Description |
: |
continuous |
| Sampling and analysis frequency |
: |
Hourly |
| Sampling environment |
: |
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| Description for sampling analysis |
: |
The analysis of CO, as well as CH4,is currently made at Alert, Fraserdale, Candle Lake and Sable Island using an Aglilent (formerly Hewlett Packard) gas chromatographs employing flame ionization detection. Details on the software and data flow for all gas chromatographic parameters, including CO have been described in detail in the CH4 section. |
| Instrument and Analysis |
| Measurement method |
: |
Gas Chromatography (FID) |
| Current status and history of instrument |
: |
GC-FID |
| Description of instrument |
: |
Agilent
Model 6890N |
| Calibration |
| Current scale employed in the measurement |
: |
WMO CO scale |
| Measurement calibration |
: |
All CO measurements are referenced to a set of six 30L aluminum cylinders purchased in 1993 from Scott Marin in California. The cylinders span the range of 50 to 300 ppb and were calibrated at NOAA in 1993, 1998 and in 2004. In 2004, a second set of six 30L aluminum cylinders (50 to 320 ppb) were purchased and calibrated at NOAA. These two sets of six tanks are also run against each other periodically to check for internal consistency. The CO calibration scale and gas standards used at Environment Canada program have been describe in detail in the 2002 Canadian Baseline Summary report. |
| Scale and calibration(treasability) |
: |
WMO CO scale |
| Data Processing |
| Measurement unit |
: |
ppb |
| Data processing |
: |
Automated control and sampling protocols are programmed in methods and sequences within the ChemStation software. Six-hour sequences comprised of a series of standard and ambient injections programmed in individual methods are used at all sites. An injection protocol typically includes a working standard followed by 5 ambient injections, repeated every hour. Every 3rd hour (in the 6 hour sequence), two ambient injections are replaced by target tank injections. At the end of the 6 hour interval, the files are copied, renamed according to the date and time of injection. This permits all the files for each injection to have unique file names, which cannot be duplicated by subsequent injections. The data files are then compressed and sent to Toronto (every 6 hours) for subsequent processing. |
| Processing for averaging |
: |
Processing for Hourly Data:
Hourly Data: Average of all individual 10 minute ambient injections. Data is reported at hour ending.
Processing for Daily Data:
Daily and monthly data is averaged only afternoon data. To do this we convert the date/time field to local standard time and then average the data from 1600-1900 inclusive.
Processing for Monthly Data:
Daily and monthly data is averaged only afternoon data. To do this we convert the date/time field to local standard time and then average the data from 1600-1900 inclusive. |
| Data flag |
: |
2 Flags are used to describe the data.
0-invalid
1-valid |
| Data remarks |
: |
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| Other Information |
| Scientific aim |
: |
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| Reference |
: |
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| submitted by Environment Canada |
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