Poster (Scientific congresses and symposiums)
IRGA GAS SAMPLING SYSTEM DIMENSIONING: LABORATORY AND FIELD EXPERIMENTS
De Ligne, Anne; Joly, Lilian; Cousin, Julien et al.
20141st ICOS Conference
 

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Keywords :
LI-7200; filter; Rain-cup
Abstract :
[en] The gas sampling system (GSS), which carries air from the sampling point to the IRGA, is an essential component of the eddy covariance system. It has to meet several constraints, among which minimizing high frequency attenuation of concentration measurement and keeping pressure drop in the measurement cell in an acceptable range. Rain cup, filters, tubes and pumps are key elements of this system and need proper dimensioning. The elaboration of the ICOS protocol for IRGA required such dimensioning and optimization. Laboratory and field measurements were carried out with this aim. In the laboratory, a dynamic calibration bench was developed to investigate experimentally the pressure drop and the concentration fluctuation attenuation caused by different filters. In the field, three LI-7200 equipped with different GSS were installed and run at the Dorinne Terrestrial Observatory (ICOS-Belgium). Main experiment conclusions were that: • The shape and size of the rain cup has a critical impact on cut off frequencies • The filter porosity and size has a critical impact on pressure drop • Filter heating is necessary in order to avoid condensation and filter blocking These experiments led to the definition of the GSS functioning range that is finally proposed in the ICOS IRGA protocol.
Disciplines :
Environmental sciences & ecology
Author, co-author :
De Ligne, Anne ;  University of Liege, Gembloux Agro-Bio Tech > Dept. of Biosystem Engineering (BIOSE) > Atmosphere Exchanges, Belgium
Joly, Lilian;  University of Reims > Groupe de Spectrométrie Moléculaire et Atmosphérique
Cousin, Julien;  University of Reims > Groupe de Spectrométrie Moléculaire et Atmosphérique
Chauvin, Nicolas;  University of Reims > Groupe de Spectrométrie Moléculaire et Atmosphérique
Decarpenterie, Thomas;  University of Reims > Groupe de Spectrométrie Moléculaire et Atmosphérique
Aubinet, Marc ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Physique des bio-systèmes
Language :
English
Title :
IRGA GAS SAMPLING SYSTEM DIMENSIONING: LABORATORY AND FIELD EXPERIMENTS
Publication date :
23 September 2014
Number of pages :
A0
Event name :
1st ICOS Conference
Event date :
du 23 au 26 septembre 2014
Audience :
International
Available on ORBi :
since 02 November 2014

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