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Monte Cimone
-O3-
| Observation |
| Category |
: |
Air sampling observation |
| Situation |
: |
ongoing |
| Time zone |
: |
Local time +1 |
| Sampling |
| Sampling height |
: |
7 |
| Description |
: |
continuous |
| Sampling and analysis frequency |
: |
Continuously on 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 |
: |
Light absorption analysis (UV) |
| Current status and history of instrument |
: |
Period in use: 1996 January - 2012 December
Product Name: 1108 W/GEN (#136)
Manufacturer: Dasibi Corporation
Period in ude: 2013 January - present
Product name: Thermo Tei 49i (#1225011092)
Manufacturer: Thermo Scientific |
| Description of instrument |
: |
Dasibi 1108 W/GEN:
Range (as declared by Manufacturer): 0 to 1000 ppb
Precision (as declared by Manufacturer): 1 ppb
Zero drift (as declared by Manufacturer): Zero
Span drift (as declared by Manufacturer): Zero
Linearity: +/- 1 ppb
Standard uncertainty (ppb): sqrt(2.2 ppb^2 + 8.08e-06 * XO3^2), see WCC-Empa Report 12/3
Thermo Scientific Tei 49i:
Range (as declared by Manufacturer): 0 to 200 ppm
Precision (as declared by Manufacturer): 1 ppb
Zero drift 24h (as declared by Manufacturer): < 1.0 ppb
Span drift (as declared by Manufacturer): < 1% full scale per month
Linearity: +/- 1% full scale
Standard uncertainty (ppb): sqrt(0.26 ppb^2 + 2.66e-05 * XO3^2), see WCC-Empa Report 12/3 |
| Calibration |
| Current scale employed in the measurement |
: |
SRP15 (WCC-EMPA) |
| Measurement calibration |
: |
On October 2006, the laboratory transfer standard (Dasibi 1008 PC #6506) has been compared with IMGC-O3SRP at the National Institute of Metrological Research (INRIM) with primary standard and treaceability chain in Italy.
On June 2008 and September 2010, the laboratory transfer standard (Dasibi 1008 PC #6506) has been compared with SRP#15 at the World Calibration Centre for surface O3 (WCC-EMPA).
On October 2011 and January 2014, the laboratory transfer standard (Thermo Environmental Tei49i-PS #1118511036) has been compared with SRP#15 at the World Calibration Centre for surface O3 (WCC-EMPA).
On September 2012, the ozone analysers as well as the ozone calibrator TEI 49i-PS #1118511036 were compared against the WCC-Empa travelling standard (TS) with traceability to a Standard Reference Photometer (SRP).
The laboratory transfer standard (Dasibi 1008 PC #6506) was also checked and calibrated and at the DASIBI ITALIA company in July 1996, November 1999, August 2005, August 2007.
The UV photometer analyser (1108 W/GEN #136) is calibrated by the laboratory transfer standard (Dasibi 1008 PC #6506) every 3 months.
The UV photometer analyser (1108 W/GEN #136) was also checked and calibrated at the DASIBI ITALIA company in November 1996, December 1997, April 2001, November 2001, July 2005, February 2009. |
| Scale and calibration(treasability) |
: |
The laboratory transfer standards (Dasibi 1008 PC #6506 and Thermo Environmental Tei49i-PS #1118511036) have been compared with SRP#15 at the World Calibration Centre for surface O3 (WCC-EMPA). |
| Data Processing |
| Measurement unit |
: |
ppb |
| Data processing |
: |
Row data from monitoring device are acquired every minute and processed to half-hour mean values (by averaging 10 minutes mean values in the period 1996-2001).
|
| Processing for averaging |
: |
Processing for Hourly Data:
Hourly data are obtained averaging 1 minutes mean O3 values (by averaging 10 minutes mean values in the period 1996-2001).
Processing for Daily Data:
Daily data are obtained averaging hourly mean O3 values.
Processing for Monthly Data:
Monthly data are obtained averaging daily mean O3 values. |
| Data flag |
: |
No Flag |
| Data remarks |
: |
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| Other Information |
| Scientific aim |
: |
Investigation of background troposphere conditions,
Investigation of regional and long-range pollution
Investigation of stratospheric intrusion events
Model validations |
| Reference |
: |
Bonasoni P., A. Stohl, P. Cristofanelli, F. Calzolari, T. Colombo and F. Evangelisti: Background ozone variations at Mt. Cimone, Atmosp. Environ.,34,29-30,5183-5189, 2000.
Cristofanelli, P., P. Bonasoni, L. Tositti, U. Bonafe`, F. Calzolari, F. Evangelisti, S. Sandrini, and A. Stohl: A 6-year analysis of stratospheric intrusions and their influence on ozone at Mt. Cimone (2165 m above sea level), J. Geophys. Res., 111, D03306, doi:10.1029/2005JD006553.
P. Cristofanelli, P. Bonasoni, G. Carboni, F. Calzolari, L. Casarola, S. Zauli Sajani, R. Santaguida: Anomalous high ozone concentrations recorded at a high mountain station in Italy in Summer 2003. Atmos. Env. 41. 1383–1394, 2007.
Cristofanelli, P. et al.: Significant variations of trace gas composition and aerosol properties at Mt. Cimone during air mass transport from North Africa – contributions from wildfire emissions and mineral dust, Atmos. Chem. Phys., 9, 4603-4619, 2009
Cristofanelli P, Scheel H-E, Steinbacher M, Saliba M. et al. 2014. Long-term surface ozone variability at Mt. Cimone WMO/GAW global station (2165 m a.s.l., Italy), Atmospheric Environmen. 101:23-33. |
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| submitted by National Research Council, Institute of Atmospheric Sciences and Climate |
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