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Monte Cimone
-NO2-
| Observation |
| Category |
: |
Air sampling observation |
| Situation |
: |
ongoing |
| Time zone |
: |
Local time +1 |
| Sampling |
| Sampling height |
: |
7 |
| Description |
: |
continuous |
| Sampling and analysis frequency |
: |
Continuous with a 1-minute time basis. |
| Sampling 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 with a flux of 40 l/s. The air intake is composed by an external (outside building) steel pipe (internally covered by Teflon) and the internal (inside building) Pyrex pipe. A Teflon sampling line (lenght 1.5m) connects the air intake with analysers. |
| Instrument and Analysis |
| Measurement method |
: |
Chemiluminescence |
| Current status and history of instrument |
: |
Since April 2014, Thermo 42iTLE (s/n: 1321458558) |
| Description of instrument |
: |
Chemiolumiescence instrument with pre-chamber mode for removal of interferent and blue light photolitic converter for NO2 measurements. Detecion limit has been estimated 0.060 ppb after 1-hour of zero air measurements. |
| Calibration |
| Current scale employed in the measurement |
: |
Certified NO in N2 in cylinders, gas phase titration (GPT) with ozone and dynamic dilution with zero air is used for calibration.
Station standards by "Messer Italia". |
| Measurement calibration |
: |
Span by GPT and zero check carried out every 48 hours.
Once per year multi point calibration for NO. |
| Scale and calibration(treasability) |
: |
Standard gases:
Since April 2014: NO, 500 ppm, Messer Italia, #
Since Septembner 2014: NO, 500 ppm, Messer Italia, #78036
For multipoint calibration: NO, 500 ppb Messer Italia, #20141323 |
| Data Processing |
| Measurement unit |
: |
ppb |
| Data processing |
: |
Quality assurance procedures involve time series plots, daily checks of internal parameters, zero evaluation, consistency checks with other tracers and meteorological data.
Hourly mean values were calculated if 75% of 1-minute data are available. Data below the detection limit (0.06 ppb on 1-minute) were retained for the averaging processes. Data acquisition system provides 1-minute raw data averge. Invalid data caused by local emissions, malfunction were rejected before averaging.
Daily mean values were calculated if 75% of hourly data are available.
Monthly mean values were calculated if 75% of hourly data were available. |
| Processing for averaging |
: |
Processing for Hourly Data:
Hourly mean values were calculated if 75% of 1-minute data are available.
Data below the detection limit (0.06 ppb on 1-minute) were retained for the averaging processes.
Processing for Daily Data:
Obtained by averaging all available hourly data. Daily mean values were calculated if 75% of hourly data were available.
Processing for Monthly Data:
Obtained by averaging all available daily data. Monthly mean values were calculated if 75% of daily data were available. |
| Data flag |
: |
Only validated data are provided. |
| Data remarks |
: |
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| Other Information |
| Scientific aim |
: |
Atmospheric pollution studies. Ozone photochemistry. NRT data provision |
| Reference |
: |
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| submitted by National Research Council, Institute of Atmospheric Sciences and Climate |
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