Carbon cycle and natural vegetation/Description: Difference between revisions
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LPJmL is a Dynamic Global Vegetation Model ({{abbrTemplate|DGVM}}) that was developed initially to assess the role of the terrestrial biosphere in the global carbon cycle ([[Prentice et al., 2007]]). DGVMs simulate vegetation distribution and dynamics, using the concept of multiple plant functional types ({{abbrTemplate|PFT}}s) differentiated according to their bioclimatic (e.g. temperature requirement), physiological, morphological, and phenological (e.g. growing season) attributes, and competition for resources (light and water). | LPJmL is a Dynamic Global Vegetation Model ({{abbrTemplate|DGVM}}) that was developed initially to assess the role of the terrestrial biosphere in the global carbon cycle ([[Prentice et al., 2007]]). DGVMs simulate vegetation distribution and dynamics, using the concept of multiple plant functional types ({{abbrTemplate|PFT}}s) differentiated according to their bioclimatic (e.g. temperature requirement), physiological, morphological, and phenological (e.g. growing season) attributes, and competition for resources (light and water). | ||
To aggregate the vast diversity of plant species worldwide, with respect to major differences relevant to the carbon cycle, [[LPJmL model|LPJmL]] distinguishes nine plant functional types. These include e.g. tropical evergreen trees, temperate deciduous broad-leaved trees and C3 herbaceous plants. Plant dynamics are computed for each PFT present in a grid cell. As IMAGE uses the concept of biomes, combinations of PFTs in an area/grid cell are translated into a biome type (see [[Plant functional types]]). | To aggregate the vast diversity of plant species worldwide, with respect to major differences relevant to the carbon cycle, [[LPJmL model|LPJmL]] distinguishes nine plant functional types. These include e.g. tropical evergreen trees, temperate deciduous broad-leaved trees and C3 herbaceous plants. Plant dynamics are computed for each PFT present in a grid cell. As IMAGE uses the concept of biomes, combinations of PFTs in an area/grid cell are translated into a natural land cover (biome) type (see [[Plant functional types]]). | ||
===Carbon dynamics=== | ===Carbon dynamics=== | ||
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===Model linkage and simulation procedure=== | ===Model linkage and simulation procedure=== | ||
The [[LPJmL model]] has multiple links to other IMAGE components and uses IMAGE data on climate, atmospheric CO2 concentration, land use (including wood demand), and timber use and deforestation (cutting and burning). LPJmL supplies other IMAGE components with information on annual carbon fluxes, net CO2 exchange between biosphere and atmosphere, size of carbon pools, and biome classes (see [[Carbon_cycle_and_natural_vegetation|Input/output Table]] at Introduction part ). | The [[LPJmL model]] has multiple links to other IMAGE components and uses IMAGE data on climate, atmospheric CO2 concentration, land use (including wood demand), and timber use and deforestation (cutting and burning). LPJmL supplies other IMAGE components with information on annual carbon fluxes, net CO2 exchange between biosphere and atmosphere, size of carbon pools, and natural land cover (biome) classes (see [[Carbon_cycle_and_natural_vegetation|Input/output Table]] at Introduction part ). | ||
LPJmL and IMAGE are linked via an interface and starts in the simulation year of 1970. Before 1970, vegetation and soil carbon pools need to be initialised. This is done by using LPJmL first in a 1000-year spin up to initialise the natural ecosystems and their carbon pools and fluxes, followed by a 390-year spin up, in which agricultural land is gradually expanded based on historical [[HYDE database|HYDE]] land-use data ([[Klein Goldewijk et al., 2011]]). The pool sizes of timber products for 1970 are based on literature estimates ([[Lauk et al., 2012]]). | LPJmL and IMAGE are linked via an interface and starts in the simulation year of 1970. Before 1970, vegetation and soil carbon pools need to be initialised. This is done by using LPJmL first in a 1000-year spin up to initialise the natural ecosystems and their carbon pools and fluxes, followed by a 390-year spin up, in which agricultural land is gradually expanded based on historical [[HYDE database|HYDE]] land-use data ([[Klein Goldewijk et al., 2011]]). The pool sizes of timber products for 1970 are based on literature estimates ([[Lauk et al., 2012]]). | ||
Revision as of 11:03, 18 June 2014
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