Carbon cycle and natural vegetation/Description: Difference between revisions

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===Model linkage and simulation procedure===
===Model linkage and simulation procedure===
The technical link between LPJmL and IMAGE is established via an interface and starts in the simulation year of 1970. Before the coupled simulation is started, vegetation and soil carbon pools need to be initialised. This is achieved by using LPJmL first in a 1000-year spin-up in order to initialise the natural ecosystems and their carbon pools and fluxes. This is followed by a 390-year spin-up, in which the agricultural land is gradually expanded based on historical HYDE land-use data  (Klein Goldewijk et al., 2011). Timber product pool sizes of 1970 are based on literature estimates (Lauk et al., 2012). The coupled IMAGE-LPJmL simulations start in 1970 with observed climate, followed by  simulated climate for the years from 2000 onwards (Section 6.5). As the interannual variability of weather conditions is needed for the simulation of vegetation dynamics in IMAGE-LPJmL, smooth annual climate trends from IMAGE are superimposed by interannual variability fields, extracted from observed climate over the 1971–2000 period. To avoid repeating climate trends within these 30-year periods, annual anomalies are ordered at random before superimposition.
Before the IMAGE-LPJml coupled simulation is started, vegetation and soil carbon pools need to be initialised. This is achieved by using LPJmL first in a 1000-year spin-up in order to initialise the natural ecosystems and their carbon pools and fluxes. This is followed by a 390-year spin-up, in which the agricultural land is gradually expanded based on historical [[HYDE database| HYDE land-use data]]. Timber product pool sizes of 1970 are based on literature estimates (Lauk et al., 2012). The coupled IMAGE-LPJmL simulations start in 1970 with observed climate, followed by  simulated climate for the years from 2000 onwards (Section 6.5). As the interannual variability of weather conditions is needed for the simulation of vegetation dynamics in IMAGE-LPJmL, smooth annual climate trends from IMAGE are superimposed by interannual variability fields, extracted from observed climate over the 1971–2000 period. To avoid repeating climate trends within these 30-year periods, annual anomalies are ordered at random before superimposition.
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Revision as of 11:35, 7 January 2014

Link to framework components overview

Parts of Carbon cycle and natural vegetation/Description

  1. Introduction page
  2. Model description
  3. Policy issues
  4. Data, uncertainty and limitations
  5. Overview of references
Component is implemented in:
Components:
Related IMAGE components
Models/Databases
Key publications
References
Carbon cycle and natural vegetation module of LPJmL, in IMAGE 3.0
Flowchart Carbon cycle and natural vegetation. See also the Input/Output Table on the introduction page.

Model description of Carbon cycle and natural vegetation

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