Gridded biome bgc simulation with explicit fire disturbance
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Gridded Biome-BGC Simulation with Explicit Fire-disturbance. Sinkyu Kang, John Kimball, Steve W. Running Numerical Terradynamic Simulation Group, School of Forestry, Univeristy of Montan. Purpose. Demonstrate Gridded Biome-BGC run in BOREAS.

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Gridded Biome-BGC Simulation with Explicit Fire-disturbance

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Gridded biome bgc simulation with explicit fire disturbance

Gridded Biome-BGC Simulation with Explicit Fire-disturbance

Sinkyu Kang, John Kimball, Steve W. Running

Numerical Terradynamic Simulation Group, School of Forestry, Univeristy of Montan


Purpose

Purpose

Demonstrate Gridded Biome-BGC run in BOREAS.

Illustrate Biome-BGC modification for explicit fire-disturbance simulation


Process of gridded bgc

Process of Gridded BGC

  • Batch run of Biome-BGC combined with input and output modules

  • Using IDL platform

Spatial & temporal data

INI, EPC, MET file for point Biome BGC run

Batch run of point Biome BGC

Generate gridded outputs


Considering explicit fire disturbance

Considering Explicit Fire-Disturbance

Raw Data

Size and location

Before 1959: constant fire mortality

After 1959: external fire mortality from the raw data


Considering explicit fire disturbance1

Considering Explicit Fire-Disturbance

Generate fire grid

Year

cell[i,j] annual fire file

83

84

85

86

87


Considering explicit fire disturbance2

Considering Explicit Fire-Disturbance

Modifed INI & EPC files

1.0 (DIM) multiplier for shortwave radiation

CO2_CONTROL (keyword - do not remove)

1 (flag) 0=constant 1=vary with file 2=constant, file for Ndep

286.923 (ppm) constant atmospheric CO2 concentration

kco21862.txt (file) annual variable CO2 filename

FIRE_CONTROL (keyword - do not remove)

1 (flag) 0=constant fire mortality 1=vary with file

fire-5-14.txt (file) annual variable fire mortality (year fire_mortality)

SITE (keyword) start of site physical constants block

Run Modified Biome-BGC

ECOPHYS ENF-cool (wet conifer)

1 (flag) 1 = WOODY 0 = NON-WOODY

…………………………………………………….

0.005 (1/yr) annual whole-plant mortality fraction

0.005 (1/yr) mean annual fire mortality fraction

0.26(1/yr) annual carbon fraction consumed by fire

1.5 (ratio) (ALLOCATION) new fine root C : new leaf C

1.1 (ratio) (ALLOCATION) new stem C : new leaf C


Gridded biome bgc simulation with explicit fire disturbance

ET (mm/y) & NPP (gC/m2/y)

LAI (m2/m2)

Daily fire mortality

Constant fire mortality > 1959 < Explicit fire occurrence

Internal fire-disturbance

External fire-disturbance


Modification of biome bgc

Modification of Biome-BGC

  • Biome-BGC v.411

    • 47 source files

    • 8 header files

    • 2 library files

  • In this study, even this small change demanded

    • modification of 7 source files

    • modification of 4 header files

    • addition of a new subroutine source file


Application to the boreal forest biome

Application to the Boreal Forest Biome

Experimental Design

Grid size (simulation unit): 66 columns and 60 rows (ca. 660300km2)

Each simulation uses

  • identical land cover and soil property over the entire grid

  • identical spatial meteorological variable (1994~1996)

    Every simulation differs in

  • land cover types (DBF, Grass, DC, WC)

  • constant or varying ambient CO2 and internal or external fire-disturbance

  • Nine climate change scenario (control, 2oC, 20% precipitation)

    Total 108 cases of gridded Biome-BGC runs


Land cover

Land Cover

300km

660km


Topography

Topography

N

N


Climate 3 yr mean

Climate (3-yr mean)

Tmax

Tmin

Precipitation

Radiation


Sample result 1 land cover

Sample Result 1 – Land cover

DBF

(412, 87.5 g/m2)

Grass

(347, 48.6 g/m2)

DC

(279, 26.2 g/m2)

WC

(140, 8.7 g/m2)


Sample result 2 co2

Sample Result 2 – CO2

WC, Const. CO2

(140, 8.7 g/m2)

Difference (23, 2.8 g/m2)

Const. CO2 – Increasing CO2

WC, Increasing CO2

(163, 11.1 g/m2)


Sample result 3 fire

Sample Result 3 - Fire

Difference (-1.4, 3.7 g/m2)

External fire – Increasing CO2

WC, Increasing CO2

(163, 11.1 g/m2)

WC, External fire

(161, 11.8 g/m2)


Sample result 4 climate change

Sample Result 4 – Climate Change

PRCP*TEMP: PRCP(-1,0,+1), TEMP(-1,0,+1), EX: +1-1 (1.2*prcp & -2 of Temp.)

00

+10 -10

+1+1 +1-1 -1+1 -1-1

DBF, Const. CO2


Climate scenario

Climate Scenario

1.2P

0.8P

1.2P(+2T)

1.2P(-2T)

0.8P(+2T)

0.8P(-2T)


Future consideration

Future consideration

  • Model Initialization

    Spin-up run:

    • initialize soil and vegetation variable at balanced equilibrium condition

    • time consuming process as number of gridcells increase

      Extrapolation from satellite measurement:

    • satellite-driven LAI  initialize vegetation carbon variables using allometry rules (Landsat & MODIS in watershed and regional scale)

  • Replace model phenology with RS phenology (ex. MODIS)


Gridded biome bgc simulation with explicit fire disturbance

Grass

PSN (gC m-2 d-1)

yearday

Reinitialize using

satellite-driven LAI + allometry from spin-up simulation

MOD17: daily PSN (MOD17A2)

BGC: daily PSN with spin-up simulation

MOD15-BGC: daily PSN using input LAI from MOD15


Gridded biome bgc simulation with explicit fire disturbance

COOP. Weather Station, Alabama


Gridded biome bgc simulation with explicit fire disturbance

Warm (13.3 oC)

Cool

(6.2 oC)


Model overview

Model Overview

Soil temperature model

Spatially-explicit estimations

Field sampling & measurement

RS

DEM

Meteorological Data

Soil Data

1.Respiration

2.Temperature

3.Water content

4.SOM

Field LAI

NDVI

Meteorological Models

1.Air temperature

2.Precipitation

3.Solar radiation

4.Vapor pressure deficit

LAI-NDVI model

Soil moisture model

Soil respiration model


Lai model

LAI model

LAI model

LAI-NDVI model

Leaf emergency (Je)

 (Ta-5oC) > 88oC

Maximum LAI (Jm)

(Aug. 15 in this study)

End of litterfall (Jb)

 (Ta-10oC) < -150oC


Gridded biome bgc simulation with explicit fire disturbance

NDVI (Landsat TM,

August, 1991)

Mean 0.55

STDEV 0.13

(solid dots are locations where LAI was measured.)


Lai ndvi model

LAI-NDVI model

Landsat TM image in Aug. 1991

LAI measured in Aug. 1998 and 1999 using LI-COR 2000


Lai ndvi model leaf emergence and expand

LAI-NDVI Model : Leaf Emergence and Expand

120 (0~3.8 m2 m-2) 125 130

135 140 145


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