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