MAgPIE - An Open Source land-use modeling framework

4.6.0

created with goxygen 1.3.1

Age class (29_ageclass)

Description

The age-class module calculates the distribution of secondary forests and timber plantations based on Poulter dataset. This is used in 32_forestry and 35_natveg for initialization of forest areas.

Interfaces

Interfaces to other modules

Input

Output

module outputs
  Description Unit
im_plantedclass_ac
(j, ac)
Raw Distribution of ageclass in secondary forest as a proxy for planted forest \(10^6 ha\)

Realizations

(A) feb21

This realization calculates use the results from Poulter et al. (2018) for secondary forests (and timber plantations) based on MODIS satellite data. This is used in 32_forestry and 35_natveg for initialization of forest areas based on specification of endogenous (or exogenous) forest harvests. These numbers are the most consistent dataset available on spatial scale and are preferred over extarcting such numbers from LUH data due to ease of generating these numbers.

Limitations Forest fires change how the age structures of secondary or human-intervention forests over time. This being a satellite observation data probably includes such disturbances. These disturbances are not modeled extensively in MAgPIE and hence using these numbers directly in the model might generate biases.

Definitions

Objects

module-internal objects (A: feb21)
  Description Unit A
f29_forestageclasses
(j, ac_poulter)
Poulter age-class area in each cluster \(1\) x

Sets

sets in use
  description
ac Age classes
ac_plantations(ac) Possible age classes which probably belong to plantations
ac_planted(ac) Young age classes which probably belong to managed forest
ac_poulter Forest age classes in Poulter data set
ac_poulter_to_ac(ac_poulter, ac) mapping between ac and ac_poulter
age Population age groups
j number of LPJ cells

Authors

Abhijeet Mishra, Florian Humpenöder

See Also

32_forestry, 35_natveg

References

Poulter, Benjamin, Luiz Aragão, N Adela, Valentin Bellassen, Philippe Ciais, Tomomichi Kato, Xin Lin, et al. 2018. “The Global Forest Age Dataset (Gfadv1. 0).”