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Precision CO 2 on Short towers A first evaluation for Loobos-NL Bart Kruijt and Jan Elbers.

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Presentation on theme: "Precision CO 2 on Short towers A first evaluation for Loobos-NL Bart Kruijt and Jan Elbers."— Presentation transcript:

1 Precision CO 2 on Short towers A first evaluation for Loobos-NL Bart Kruijt and Jan Elbers

2 introduction For overview of activity 2.7, See talk Tuula Aalto Idea of ‘short tower CO 2 ’: Low cost, higher density Concurrent with (CarboEurope) flux and meteo sites Would allow ‘virtual tall tower approach’ (modified flux- gradient) Regional inversion, local interpretation of profiles and temporal dynamics

3 This talk: a preliminary analysis for Loobos: functioning Error Spatial consistency Plans for use of data

4 AIRCOA on-line majadas Loobos was last in getting operational: -low power -only GPRS connection, no internet -Code needed substantial rewriting - Loobos was the FIRST in going on-line! - we have a beautiful moderate-cost system now!

5 Full record top level at Loobos with error bars

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8 Day AND night!

9 Other sites? Finland: majadas Nov -07Jun -08

10 URAS - LiCor NCAR specified ppm precision. Why are we doing worse? -Temperature and humidity ranges larger (less continental, no cabins) -Reference gas (dry) shares part of tubing with sample (wet) -Pressure gradient from reference to IRGA  vulnerability to leaks

11 Cabauw Loobos

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14 Difference Cabauw - Loobos Cabauw Loobos North South East West Amateuristic analysis asking for modellers!

15 Compare: Majadas - La Muela Le Bray – Puy de Dome Tharandt – Heghatsal Hyyttiala – Pallas … all together!

16 Plans for analysis (Loobos, all sites) (limited time) Improve accuracy (??) Explore extrapolation to CBL (‘VTT’) Explore use in regional inversion (RAMS-VU) in Dutch CO 2 budgetting study Explore use in micrometeorology  can the rich information on (all) fluxes, profiles and meteo help in vertical scaling, in regional modelling and inversion?

17 Conclusion © Wageningen UR -Accuracy so far + / ppm - TBI ? -Beautiful in-canopy gradients waiting for analysis -Useful data for use in (regional) inversions?


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