Mat instrumenté de 60 mètres
Contact : Fabienne Lohou, Solène Derrien, Alban Philibert
Le Centre de Recherches Atmosphériques est équipé d’un mât de 60m de hauteur, équipé pour la mesure des flux d’énergie.
Il mesure en continu à basse fréquence (0.1 Hz ou 1Hz) température, humidité, précipitation, pression, flux de chaleur dans le sol, vent, concentration en ozone et rayonnement (visible et IR), et à haute fréquence, composantes du vent, température virtuelle, pression, concentration en CO2 et H2O vapeur pour les calculs de flux d’énergie.
Il est équipé à 6 niveaux: au sol, à 2 m, à 15 m, à 30 m, à 45 m et à 60m.
Instrumentation du Mât de 60m en mai 2010. (c) Marie Lothon – CRA
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Vue d’ensemble du mât de 60m instrumenté – (c) Marie Lothon
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Il a fait partie du programme FluxPyr de 2009 à 2012.
Programme FLUXPYR (2009 – 2012)
Contact FluxPyr : Frédérique Saïd
FLUXPYR PROGRAM is part of the POCTEFA Programme (Interreg IV-A, 2007-2013) and aims at developing a cross-border network of infrastructures (e.g. micro-meteorological stations, aerial platforms) and experts for the assessment and management of water, carbon and energy fluxes and stocks in agricultural and pastoral ecosystems in the Pyrenees. The long-term objective is to combine flux measurements, meteorological data, remote sensing techniques and modelling to produce predictive land use, productivity, carbon distribution and snow cover maps, and to assess the impacts of climate and land use change on Pyrenean ecosystems.
In this frame, a 60m tower has been equipped at 5 levels for mean wind, temperature, humidity, ozone, CO2 and radiation measurements as well as turbulent fluxes of sensible heat, latent heat and CO2. The 60 m mast is part of the network of flux measurements (see Figure 1) in a grassland area. Measurements will be conducted continuously during several years to be able to document climatic scales. The masts measurements will be useful to study intermediate scales between the grass parcel, the integrated landscape (grass parcels and woods as seen in Figure 2) and the satellite pixel.
The mast measurements also allow making process studies such as those performed in the frame of the BLLAST (Boundary Layer Late Afternoon and Sunset Turbulence) experiment during June and July 2011.
Finally the mast helps to train students to study atmospheric physics.
SENSORS AND SAMPLING FREQUENCY
Level |
Measured parameters |
Unit |
Frequency |
Sensor |
2.38 m |
Temperature |
°C |
0.1 HZ |
Campbell HMP45 |
2.38 m |
Relative humidity |
% |
0.1 HZ |
Campbell HMP45 |
1.4 m |
Pressure |
hPa |
0.1 HZ |
Barometer vaïssala PTB101B |
0 m |
Rainfall |
mm |
0.1 HZ |
Rain Gauge ARG100 |
-0.05 m |
Ground flux 1 |
Wm-2 |
0.1 HZ |
Hukseflux HFP01 |
-0.05 m |
Ground flux 2 |
Wm-2 |
0.1 HZ |
Hukseflux HFP01 |
-0.05 m |
Ground flux 3 |
Wm-2 |
0.1 HZ |
Hukseflux HFP01 |
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14.8 m |
Wind speed |
ms-1 |
0.1 HZ |
Switching anemometer A100L2 |
14.8 m |
Wind direction |
deg |
0.1 HZ |
Vector instrument W200P wind vane |
14.8 m |
Temperature |
°C |
0.1 HZ |
Campbell HMP45 |
14.8 m |
Relative Humidity |
% |
0.1 HZ |
Campbell HMP45 |
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|
29.4 m |
Temperature |
°C |
1 HZ |
Campbell HMP45 |
29.4 m |
Relative humidity |
% |
1 HZ |
Campbell HMP45 |
27.6 m |
Ozone concentration |
ppbv |
1 HZ |
Environnement SA O341M |
29.3 m |
Temperature |
°C |
10 HZ |
Campbell Csat 3D Sonic anemometer |
29.3 m |
3 wind components |
ms-1 |
10 HZ |
Campbell Csat 3D Sonic anemometer |
29.3 m |
Water vapour mixing ratio |
mmole m-3 |
10 HZ |
Licor 7500A CO2/H2O analyser |
29.3 m |
CO2 mixing ratio |
mmole m-3 |
10 HZ |
Licor 7500A CO2/H2O analyser |
29.3 m |
pressure |
kPa |
10 HZ |
Licor 7500A CO2/H2O analyser |
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45.6 m |
Temperature |
°C |
1 HZ |
Campbell HMP45 |
45.6 m |
Relative humidity |
% |
1 HZ |
Campbell HMP45 |
45.3 m |
Wind speed |
ms-1 |
1 HZ |
Wind monitor Young 05103 |
45.3 m |
Wind direction |
deg |
1 HZ |
Wind monitor Young 05103 |
45.8 m |
Temperature |
°C |
10 Hz |
Gill master pro 3D sonic anemometer |
45.8 m |
3 wind components |
ms-1 |
10 Hz |
Gill master pro 3D sonic anemometer |
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61.6 m |
Temperature |
°C |
1 HZ |
Campbell HMP45 |
61.6 m |
Relative humidity |
% |
1 HZ |
Campbell HMP45 |
61.7 m |
4 radiative components |
Wm-2 |
1 HZ |
CNR1 Kipp Zonen |
61.4 m |
Temperature |
°C |
10 Hz |
Campbell Csat 3D Sonic anemometer |
61.4 m |
3 wind components |
ms-1 |
10 Hz |
Campbell Csat 3D Sonic anemometer |
61.4 m |
Water vapour fluctuations |
mV |
10 Hz |
Campbell KH20 hygrometer |
OPERATING
Energy fluxes are calculated with the eddy correlation method, using a matlab processing with similar steps as EDIRE’s. Monthly post-processing reports with fluxes and mean parameters are also provided there.
SOME RESULTS
SUPPORT
FluxPyr is supported by the European POCTEFA Programme EFA 34/08 – Interreg IV-A, which provided the Licor 30m hygrometer and part of the operating budget. CNRS and Université Paul Sabatier supported all the remaining equipment and operating budget.