thomas foken, mathias göckede, matthias mauder university of bayreuth, germany department of...
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Thomas Foken, Mathias Göckede, Matthias Mauder University of Bayreuth, Germany Department of Micrometeorology 3 nd CarboEurope-IP Integrated Project Meeting Levi, Finland November, Link between data quality and the characteristics of the surrounding terrain - Determination of a footprint climatology for a longer measurement period - Analysis of the flux contributions emitted from different types of land use to the total flux measured - Special effects, like influences of the sensor on the measurements QA/QC: Evaluation of measurement sites - Objectives -TRANSCRIPT
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
Thomas Foken, Mathias Göckede, Matthias Mauder
Department of MicrometeorologyUniversity of Bayreuth, Germany
with contributions by Tiina MarkkanenUniversity of Helsinki
Results of footprint based quality assessment and quality control
study for forest sites
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
Combination of QA/QC tools for eddy covariance measurements with footprint analyses
- Quality assessment: Assignment of QC-flags for individual flux measurements according to Foken & Wichura (1996) and Foken et al. (2004)- Footprint-Analysis: Calculation of source areas (model by Rannik et al., 2003) to determine the spatial context of a measurement
QA/QC: Evaluation of measurement sites - Concept -
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
- Link between data quality and the characteristics of the surrounding terrain
- Determination of a footprint climatology for a longer measurement period
- Analysis of the flux contributions emitted from different types of land use to the total flux measured
- Special effects, like influences of the sensor on the measurements
QA/QC: Evaluation of measurement sites - Objectives -
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
QA/QC: Evaluation of measurement sites - Working programme -
Sites with measurements above high vegetation
- 23 sites were analyzed and 2 associated sites
- no information available from 5 sites (FR-Fon, SE-Nor, SE-Sky1, SE-Sky2, UK-PLa3)
Sites with measurements above low vegetation
- no analysis of meteorological measurements- fetch analysis, flux contribution from target land use
- not reported in this paper
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
FI-Sod
Data quality of latent heat flux
Influences of the sensor set up METEK USA-1; Use of the head correction
1 2 3 4 5 6 7 8 9
Distance East - West [m]-300 0 300 600
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tanc
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[m]
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N
30
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-0.03 -0.02 -0.01 0.00 0.01 0.02 0.03 0.04
Distance East - West [m]-800 -400 0 400 800
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Distance East - West [m]-800 -400 0 400 800
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[m]
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510
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Fr-Pue
vertical wind velocity after planar-fit
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
DE-Wet
Boom on the tower, data quality of momentum flux
Influences of the sensor set up Mounting of the sonic anemometer on the tower
Similar results for NL-Loo
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
Footprint analysis of fluxes emitted from the target area
Chose a threshold of 80% of flux emitted by the target land cover 1. 90% or more of data exceed 80%-threshold: 13 sites
2. 60% to 90% of data exceed 80% threshold: 4 sites
3. 50% to 60% of data exceed the 80% threshold: 3 sites
4. Less than 50% of data exceed the 80% threshold: 4 sites
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
e N
orth
- So
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[m]
-400
0
400
+
510
20
deciduous
coniferous
grasslandhigh cropslow crops
N
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
e N
orth
- So
uth
[m]
-400
0
400
+
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20
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
e N
orth
- So
uth
[m]
-400
0
400
+
510
20
deciduous
coniferous
grasslandhigh cropslow crops
deciduous
coniferous
grasslandhigh cropslow crops
NN
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
e Nor
th -
Sout
h [m
]
-400
0
400
+5
10
deciduous
coniferous
grassland
high cropslow crops
Distance East - West [m]-800 -400 0 400 800
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tanc
e Nor
th -
Sout
h [m
]
-400
0
400
+5
10
Distance East - West [m]-800 -400 0 400 800
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Sout
h [m
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400
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
e Nor
th -
Sout
h [m
]
-400
0
400
+5
10
deciduous
coniferous
grassland
high cropslow crops
deciduous
coniferous
grassland
high cropslow crops
NN
Distance East - West [m]-800 -400 0 400 800
Dist
ance
Nor
th -
Sout
h [m
]
-400
0
400
+
510
20
deciduous
coniferous
grasslandhigh cropslow crops
Distance East - West [m]-800 -400 0 400 800
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ance
Nor
th -
Sout
h [m
]
-400
0
400
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510
20
Distance East - West [m]-800 -400 0 400 800
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ance
Nor
th -
Sout
h [m
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0
400
Distance East - West [m]-800 -400 0 400 800
Dist
ance
Nor
th -
Sout
h [m
]
-400
0
400
+
510
20
deciduous
coniferous
grasslandhigh cropslow crops
deciduous
coniferous
grasslandhigh cropslow crops
NN
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
e Nor
th -
Sout
h [m
]
-400
0
400
+
5
1020
30
deciduous
coniferous
grasslandhigh cropslow crops
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
e Nor
th -
Sout
h [m
]
-400
0
400
+
5
1020
30
Distance East - West [m]-800 -400 0 400 800
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Sout
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0
400
Distance East - West [m]-800 -400 0 400 800
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tanc
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-400
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400
+
5
1020
30
deciduous
coniferous
grasslandhigh cropslow crops
deciduous
coniferous
grasslandhigh cropslow crops
NN
deciduous coniferous grassland high crops low crops
all unstable
stableneutral
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
e N
orth
- So
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[m]
-400
0
400
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510
20
deciduous
coniferous
grasslandhigh cropslow crops
N
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
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[m]
-400
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Distance East - West [m]-800 -400 0 400 800
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[m]
-400
0
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deciduous
coniferous
grasslandhigh cropslow crops
deciduous
coniferous
grasslandhigh cropslow crops
NN
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
e Nor
th -
Sout
h [m
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-400
0
400
+5
10
deciduous
coniferous
grassland
high cropslow crops
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
e Nor
th -
Sout
h [m
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-400
0
400
+5
10
Distance East - West [m]-800 -400 0 400 800
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tanc
e Nor
th -
Sout
h [m
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-400
0
400
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
e Nor
th -
Sout
h [m
]
-400
0
400
+5
10
deciduous
coniferous
grassland
high cropslow crops
deciduous
coniferous
grassland
high cropslow crops
NN
Distance East - West [m]-800 -400 0 400 800
Dist
ance
Nor
th -
Sout
h [m
]
-400
0
400
+
510
20
deciduous
coniferous
grasslandhigh cropslow crops
Distance East - West [m]-800 -400 0 400 800
Dist
ance
Nor
th -
Sout
h [m
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-400
0
400
+
510
20
Distance East - West [m]-800 -400 0 400 800
Dist
ance
Nor
th -
Sout
h [m
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-400
0
400
Distance East - West [m]-800 -400 0 400 800
Dist
ance
Nor
th -
Sout
h [m
]
-400
0
400
+
510
20
deciduous
coniferous
grasslandhigh cropslow crops
deciduous
coniferous
grasslandhigh cropslow crops
NN
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
e Nor
th -
Sout
h [m
]
-400
0
400
+
5
1020
30
deciduous
coniferous
grasslandhigh cropslow crops
Distance East - West [m]-800 -400 0 400 800
Dis
tanc
e Nor
th -
Sout
h [m
]
-400
0
400
+
5
1020
30
Distance East - West [m]-800 -400 0 400 800
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tanc
e Nor
th -
Sout
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400
Distance East - West [m]-800 -400 0 400 800
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tanc
e Nor
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h [m
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-400
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400
+
5
1020
30
deciduous
coniferous
grasslandhigh cropslow crops
deciduous
coniferous
grasslandhigh cropslow crops
NN
deciduous coniferous grassland high crops low crops
all unstable
stableneutral
DK-Sor
Category 4: Fr-Pue, BE-Bra, DK-Sor, PT-Mit1
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
PT-Mit1
Category 4: Fr-Pue, BE-Bra, DK-Sor, PT-Mit1
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
Flux data quality assessment
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
Flux data quality assessment
1. Highest quality – no disturbances: 6 sites
2. Only disturbances in isolated wind sectors: 7 sites
3. Isolated disturbances and up to one omnidirectional effect: 7 sites
4. Multiple omnidirectional effects: 5 sites
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
Category 4: CH-Lae, ES-LMa, FI-Hyy, Fr-Pue, It-Col
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Distance East - West [m]-300 0 300 600
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all unstable
stableneutral
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Distance East - West [m]-300 0 300 600
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Distance East - West [m]-300 0 300 600
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- So
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[m]
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600
+
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1020
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Distance East - West [m]-300 0 300 600
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tanc
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- So
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[m]
-300
0
300
600
+
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1020
NN
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Distance East - West [m]-300 0 300 600
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tanc
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- So
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-300
0
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600
+
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10
20
N
30
Distance East - West [m]-300 0 300 600
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- So
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[m]
-300
0
300
600
+
5
10
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30
all unstable
stableneutral
1 2 3 4 5 6 7 8 9
FI-Hyy:
CO2-flux
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
Most of the stations: Slightly worse quality during unstable stratification coursed by convection and coherent structures
DE-Wei:
momentum-flux
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
Overview (all stations)
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
Overview (all stations)
Thomas Foken, Mathias Göckede, Matthias MauderUniversity of Bayreuth, GermanyDepartment of Micrometeorology
3nd CarboEurope-IP Integrated Project MeetingLevi, Finland
13-18 November, 2005
Conclusions
• The footprint and data quality analysis can only be one criteria for site evaluation.
• Is the ecosystem or the latitude or altitude of the station important for the aims of CARBOEUROPE ?
• Is the special character of an ecosystem (boreal, alpine) a reason for a lower data quality ?
• Is the station equipped also with other measuring systems that this station can be used for further research ?
• Is the staff of the station able to handle even complicate situations and make footprint and data quality analysis before submitting the data to the data basis ?