State of the art
Greenhouse gas and Trace gas measurements
at Lutjewad, Groningen
Measuring CO2, CH4, CO, N2O, SF6 and 222Radon
to determine their atmospheric concentrations and source/sink functions
PhD research outline by Sander van der Laan
Center for Isotope Research, Groningen
16 December 2005
Lutjewad, Groningen
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Research goals
To quantify the fluxes of CO2, CH4 and N2O using eddy covariance, radon and
gradient measurements
To monitor atmospheric concentrations of CO2, CH4, CO, N2O, SF6
Measurement site
Highly interesting/complex measuring site
North:
0.5 km reclamation area with salt tolerant grasses
10 km mostly tidal flat area (distance to schiermonnikoog)
South:
Cropland/grassland
Measurement site
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Measurement site
North/North-West (Wadden Sea)
North
Mostly tidal flats
North-West
More open water
Measurement site
South/South-east
Mostly (cropland/grassland)
Important parameters:
Land use, harvest, cattle, fertilization, crop density
Planned measurements at Lutjewad
In short:
• Atmospheric concentration measurements of CO2, CH4, CO, N2O, SF6 (GC)
at 3 different heights (gradient)
•
222Radon
concentrations (radon detector)
• 222Radon flux measurements (radon flux chambers)
• CO2 flux measurements (eddy covariance)
• CO2, CH4 and N2O flux measurements (radon/gradient)
• O2 concentration measurements (oxzilla)
Available Equipment/data
Modified Agilent 6890N gas chromatograph
Concentrations of CO2, CH4, CO, N2O, SF6
At 7 m, 40 m and 60 m
Available Equipment/data
Available Equipment/data
Eddy covariance (CO2 flux measurements)
Licor 7500 CO2/H2O analyzer
Gill 3D-sonic T15 wind meter
Preliminary measurements
150.00
25.00
0.00
0.00
6.00
12.00
18.00
H2O-Flux
CO2-Flux
0.00
24.00
CO2-Flux [umol/m2/s]
Heat Flux, H20-Flux [W/m2]
Heat Flux
CO2 uptake (growth period)
-150.00
-25.00
Average fluxes during 3 weeks of measurements, all wind directions
Preliminary measurements
30.00
CO2-Flux [umol/m2/sec]
Inversion layer effect
y = -0.0253x - 0.7774
0.00
0.00
500.00
-30.00
Incident Visible Radiation [W/m 2]
1/2 Hr average CO2 fluxes during 3 weeks of measurements, Land
1000.00
Preliminary measurements
CO2-Flux [umol/m2/sec]
30.00
y = -0.0183x + 0.8602
0.00
0.00
500.00
-30.00
Incident Visible Radiation [W/m 2]
1/2 Hr average CO2 fluxes during 3 weeks of measurements, Sea
1000.00
Available Equipment/data
222Radon
activity detector
Radon concentrations
222Radon-
and CO2 flux chambers
Radon flux measurements
mBq/m3
Available Equipment/data
N
W
S
O
N
Available Equipment/data
14C
isotope measurements (14C/CO ratio)
Meteo data
(wind direction, rain, temperature, solar radiation)
Agricultural data, sea-water level, soil research
Questions/ suggestions for research
mBq/m3
Available Equipment/data
N
W
S
O
N