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Monte Cimone
-CO-
| Observation |
| Category |
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Air sampling observation |
| Situation |
: |
2010-03-01 |
| Time zone |
: |
Local time +1 |
| Sampling |
| Sampling height |
: |
7 |
| Description |
: |
continuous |
| Sampling and analysis frequency |
: |
high flux of real air continuosly flow through the sampling line and every 30 minutes a portion is splitted for 3 minutes to the gas-chromatograph sampling loop. |
| Sampling environment |
: |
Environment: Mountain peak with completly free horizon.
No local sources of contamination. No access by road.
Timberline about 300m below the measurement site. |
| Description for sampling analysis |
: |
The air is sampled by a 2m long heated intake at 7 m height above
the ground. The air intake is composed by an external (outside building) steel pipe (internally covered by Teflon) and the internal (inside building) Pyrex pipe.
A Stainless steel sampling line (lenght 10m) connects the air intake with analyzer high flux sampling pump. |
| Instrument and Analysis |
| Measurement method |
: |
Gas Chromatography (RGD) |
| Current status and history of instrument |
: |
measurements started on Jan 2007 with a modified version of a commercial RGD2-Trace Analytical analyzer; system has stopped working on March 2010 due to an electronic failure to the detector MB. |
| Description of instrument |
: |
time resolution: 1 measurement every 30 minutes;
sensitivity: +- 1 ppb
detection limit: 10 ppb
measurements range: 1 - 10^3 (10 ppb - 10 ppm)
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| Calibration |
| Current scale employed in the measurement |
: |
indirect link to NOAA 2004 scale |
| Measurement calibration |
: |
every 15 minutes a sample is analyzed alternating between real air and reference standard in order to correct for short time instrumental drifts. molar fraction is calculated from the ratio of the peak heights and than corrected for non linearity of the detector |
| Scale and calibration(treasability) |
: |
reference standard are real air pumped in Luxfer Scott Marrin cylinders and calibrated at MPI-Jena against NOAA cylinders. |
| Data Processing |
| Measurement unit |
: |
ppbv |
| Data processing |
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| Processing for averaging |
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| Data flag |
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| Data remarks |
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Each data submitted represent a real acquired concentration point, none of the post-acquisition averageing operation has been done. The precision of the measurements is then reported in the data file (REM column) as the relative standard deviation (expressed in percentage) of the repeated measure of the working standard performed in the same day of each real sample analysis (and is generally calculated over 48 working standard runs per day). |
| Other Information |
| Scientific aim |
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| Reference |
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| submitted by National Research Council, Institute of Atmospheric Sciences and Climate |
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