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Fluxes from Across the Street Using Artificial Neural ...

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Fluxes from Across the StreetUsing Artificial Neural Networks to Model Carbon Cycling from Paired Flux SitesDavid E. ReedJeralynM. PoeMichaelAbrahaJiquanChenMichigan State University
Thought experiment
Annual fluxes
Diel processes
Hypothetical 2ndmeasurement
Coherent signals
Still coherent?
Still coherent?
To what extentis information froma single eddy covariance footprint useful outside of that footprint?
Utilize highest density flux networkCluster of 13 Michigan sites within <50 mile radiusCluster of 4 Wisconsin Sites
Exploring This Question
Several Approaches
Time-Series AnalysisGeospatial StatisticsModel-Data Fusion
Several Approaches
Time-Series AnalysisDo ecosystem fluxes have a common mode of variability?B33I-2799: Spatial coherence of carbon flux towers in Midwest ecosystems
Several Approaches
Geospatial StatisticsAt what distance are ecosystem variability modes coherent?
Distance
Coherence
Range
Sill
Nugget
Several Approaches
Model-Data Fusion
Gap Filling AsModel-Data Fusion
Temperature
Respiration
Light
Photosynthesis
Environmental Observations
Surface Fluxes
1 Site
Artificial Neural Networks
Environmental Observations
Surface Fluxes
1 Site
?
?
?
?
?
?
Data relationships
Vs Non-linear regressions, marginal distribution sampling (lookup table), and mean diurnal variation
Environmental Observations
Surface Fluxes
1 Site
Antje M. Moffat et al, Agricultural and Forest Meteorology, 2007Comprehensive comparison of gap-filling techniques for eddy covariance net carbon fluxes
Paired Site Design at MSU’s LTER
Environmental Observations
Surface Fluxes
Site 1
Environmental Observations
Surface Fluxes
Site 2
MSU’s LTER
Different land use histories, we’ll chose to ignore this for todayAbraha, M. , Chen, J. , Chu, H. ,Zenone, T. , John, R. , Su, Y. , Hamilton, S. K. and Robertson, G. P. (2015), Evapotranspiration of annual and perennial biofuel crops in a variable climate. GCB Bioenergy, 7: 1344-1356. doi:10.1111/gcbb.12239
Daily and 30-Minute Fluxes48 Site-Years
Environmental Observations
Surface Fluxes
Site 1
Environmental Observations
Surface Fluxes
Site 2
What does this look like?
What does this look like?
What does this look like?
What does this look like?
What does this look like?
Estimated fluxes, Seasonal
Estimated fluxes
Estimated fluxes
Estimated fluxes at Six Sites
Estimated fluxes at Six Sites
To what extent is information froma single eddy covariance footprint useful outside of that footprint?
To what extent is information froma single eddy covariance footprint useful outside of that footprint?
To what extent is information froma single eddy covariance footprint useful outside of that footprint?
To what extent is information froma single eddy covariance footprint useful outside of that footprint?
Thank you for any feedback
JeralynPoe will be presenting her ½ of this work tomorrowB33I-2799: Spatial coherence of carbon flux towers in Midwest ecosystemsShe will be applying for graduate school positions next year

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Fluxes from Across the Street Using Artificial Neural ...