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.
Environment: Mountain peak with completly free horizon.
No local sources of contamination. No access by road.
Timberline about 300m below the measurement site.
Gas Chromatography (FID)
Current status and history of Instruments
measurements started on Jan 2007 with a modified version of a commercial Agilent GC6890 and are still ongoing;
Description of Instruments
time resolution: 1 measurement every 30 minutes;
sensitivity: generally below 2 ppbv
detection limit: theoretical LOQ (S/N = 10) 45 ppbv
measurements range: fully calibrated in the range 1800 to 1980 ppb (NOAA cylinders available); extrapolated for higher values
Local time (UTC+1)
2008-01-01 - 2016-12-31
event, daily, monthly
Other Descriptions for Sampling and Analyses
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 the high flux sampling pump in front of the sampling loop of the analyzer; a cracking check valve is installed downstream the pump to ensure a sligthly overpressure inside the sampling loop and discharge the excess of flow to vent.
University of Urbino - Italy
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(Created : 2001/07/02 Updated : 2018/07/11)
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