Age class (28_ageclass)

Description

The age-class module provides forest area in age-classes to other modules. The interface im_forest_ageclass is used in 35_natveg for the initialization of secondary forest areas.

Interfaces

Interfaces to other modules

Output

module outputs
	Description	Unit
im_forest_ageclass (j, ac)	Forest area in 5-year age-classes based on GFAD	\(10^6 ha\)

Realizations

(A) oct24

This realization provides forest area in age-classes im_forest_ageclass based on the Global Forest Age Dataset (GFAD V1.1) from Poulter et al. (2019).

Limitations Disturbances such as forest fires change the age structure of forests over time. GFAD V1.1 likely includes such disturbances in younger age-classes (ac_young). Since forest disturbances are not modeled extensively in MAgPIE, using these numbers directly in the model might generate biases.

Definitions

Objects

module-internal objects (A: oct24)
	Description	Unit	A
f28_forestageclasses (j, ac_gfad)	Forest area in 15 10-year age classes from GFAD	\(Mha\)	x

Sets

sets in use
	description
ac	Age classes
ac_est(ac)	Dynamic subset of age classes for establishment
ac_gfad	Forest age classes in GFAD data set
ac_gfad_to_ac(ac_gfad, ac)	mapping between ac and ac_gfad
ac_sub(ac)	Dynamic subset of age classes excluding establishment
ac_young(ac)	Young age classes
age	Population age groups
j	number of LPJ cells
t(t_all)	Simulated time periods

Authors

Abhijeet Mishra, Florian Humpenöder

See Also

References

Poulter, Benjamin, Luiz Aragão, Niels Andela, Valentin Bellassen, Philippe Ciais, Tomomichi Kato, Xin Lin, et al. 2019. “The Global Forest Age Dataset and Its Uncertainties (GFADv1.1).” PANGAEA. https://doi.org/10.1594/PANGAEA.897392.