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OverviewBiophysics & Information Structure
Future Directions
Shop Talk: Biophysics and Patch Dynamics in
the Ecosystem Demography Model 2.2
Ryan Knox
LBNLCESM Annual Workshop - Land Modeling Working Group
Breckenridge CO
June 19, 2013
Ryan Knox ED 2.2, Scale & Biophysics
OverviewBiophysics & Information Structure
Future Directions
ED?
Terrestrial Ecosystem DynamicsSize-Age-Structure
ApproximationPhotosynthesisGrowth & AllocationAllometryMortalityDisturbanceRecruitment
LSM/SVAT/Biophysics Stuff
Ryan Knox ED 2.2, Scale & Biophysics
OverviewBiophysics & Information Structure
Future Directions
Ryan Knox ED 2.2, Scale & Biophysics
OverviewBiophysics & Information Structure
Future Directions
“Polygon”
Climate
Ryan Knox ED 2.2, Scale & Biophysics
OverviewBiophysics & Information Structure
Future Directions
Meteorology
Soil Properties -Terrain
Disturbance -Canopy Biophysics
Conservation of Mass and Energy
Plant Biophysics -Mortality -
Recruitment -Carbon Assimilation -
Phenology
Ryan Knox ED 2.2, Scale & Biophysics
OverviewBiophysics & Information Structure
Future Directions
0
5
10
15
20
25
30
35
Patch 4, 39.9 yr/o, −4.0N −60.0EH
eigh
t
1
2
3
4
log 10
(Ste
ms/
ha)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
0.2
0.4
0.6
0.8
Coh
ort L
AI
Cohort Index
Ryan Knox ED 2.2, Scale & Biophysics
OverviewBiophysics & Information Structure
Future Directions
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.80
5
10
15
20
25
30
35
Patch 4, 39.9 yr/o, −4.0N −60.0E
Hei
ght
Cumulative Canopy Coverage Fraction
1234
5 678 9
10111213
1415 1617 18
19 2021 22
23 242526
27
28
293031 32
Ryan Knox ED 2.2, Scale & Biophysics
OverviewBiophysics & Information Structure
Future Directions
Mixed Model
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.90
5
10
15
20
25
30
35
Mixed Model (Drag) 4, 39.9 yr/o, −4.0N −60.0E
Hei
ght
Leaf Area [m2]
Wind-Speed ScalingTurbulent Transport
u(z)/u(zc ) = e−n(1−ζ(z)/ζ(zc ))
cumulative drag ζ
ζ(z) =
∫z
o
[Cd(z′)a(z′)/Pm(z′)]dz′
fluid drag Cd
frontal area of the drag elements a
sheltering factor Pm
Massman and Weil,Boundary Layer Meteorology 91, 1999.
Ryan Knox ED 2.2, Scale & Biophysics
OverviewBiophysics & Information Structure
Future Directions
Plate Model
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
5
10
15
20
25
30
35
Plate Model (Radiation) 4, 39.9 yr/o, −4.0N −60.0E
Hei
ght
Area Fraction
Two-Stream Canopy RadiationScattering
dIdu
dL=
−f1(pft, θ, LAI)Idu+f2(pft, θ, LAI)Idd+f3(pft, θ, LAI)e
−KLIb0
downwelling diffuse short-wave Idd
upwelling diffuse short-wave Idu
direct short-wave incident on canopy Ib0
cumulative leaf area L
zenith angle θ
Sellers,Int. J. Remote Sensing, 6(8), 1985.
Ryan Knox ED 2.2, Scale & Biophysics
OverviewBiophysics & Information Structure
Future Directions
Amorphous
Ryan Knox ED 2.2, Scale & Biophysics
OverviewBiophysics & Information Structure
Future Directions
−20
−10
0
10
Total
0
5
10
15
−20
−10
0
10
Early Tropical
0
1
2
3
−20
−10
0
10
Mid Tropical
0
0.05
0.1
0.15
0.2
−20
−10
0
10
Late Tropical
0
5
10
AGB [kgC/m2]
Present Day (2008)Above Ground Biomass“Spun-Up” 500 years
Ryan Knox ED 2.2, Scale & Biophysics
OverviewBiophysics & Information Structure
Future Directions
more axes for a probabalistic model?
characterization of disturbance
global scale PFT parameterizations
coordinating with other communities like CESM-ED-CLM!
Ryan Knox ED 2.2, Scale & Biophysics
OverviewBiophysics & Information Structure
Future Directions
Thank you
Discussion? Comments?
Ryan Knox ED 2.2, Scale & Biophysics
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