Carbon, vegetation, agriculture and water: Difference between revisions

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m (RinekeOostenrijk moved page Vegetation, hydrology and agriculture to Carbon, vegetation, agriculture and water without leaving a redirect: Text replace - "Vegetation, hydrology and agriculture" to "Carbon, vegetation, agriculture and water")
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{{AggregatedComponentTemplate
{{AggregatedComponentTemplate
|ComponentCode=VHA
|KeyReference=Sitch et al., 2003; Gerten et al., 2004; Bondeau et al., 2007;
|KeyReference=Sitch et al., 2003; Gerten et al., 2004; Bondeau et al., 2007;
|Description=[[LPJmL model|LPJmL]] is the vegetation, hydrology and agricultural model in IMAGE 3.0 and consists of the three components: [[Carbon cycle and natural vegetation]], [[Crops and grass]], [[Water]].
|Description=[[LPJmL model|LPJmL]] is the carbon, vegetation, agricultural and hydrology model in IMAGE 3.0 and consists of the three components: [[Carbon cycle and natural vegetation]], [[Crops and grass]], [[Water]].


Within the Earth system, the terrestrial biosphere is the component that is most visibly impacted by human activity. Large parts of the land surface and the terrestrial vegetation have been converted for human use, such as into cropland or urban areas. Although in previous versions of IMAGE, agriculture, the terrestrial carbon, water and nutrient cycles had been distinct modules, many of the direct interactions could not be sufficiently covered.  
Within the Earth system, the terrestrial biosphere is the component that bears the most visible impact of human activity. Large proportions of the land surface and the terrestrial vegetation have been converted for human use, for instance, to cropland and urban areas.  
In IMAGE 3.0, terrestrial ecosystems, both natural and agricultural, and their associated carbon and water dynamics are now covered, in the dynamic global vegetation, hydrology and agricultural model LPJmL ([[Sitch et al., 2003]]; [[Gerten et al., 2004]]; [[Bondeau et al., 2007]]) (Lund-Potsdam-Jena model with Managed Land). This does not only allow for a more detailed and process-based representation of the interacting dynamics in vegetation, carbon and agricultural production, but it also simultaneously extends the model’s scope to terrestrial freshwater dynamics. LPJmL is one of the best evaluated dynamic global vegetation models ([[HasAcronym::DGVM]]) and is widely applied both individually and coupled to other models. In order to structure the complex dynamics in the terrestrial biosphere (and also to reflect the historical IMAGE modules), LPJmL is presented here in three different sections. In [[Carbon cycle and natural vegetation]], the focus is on the simulation of carbon and vegetation dynamics, [[Crops and grass]] focuses on agricultural land use, and terrestrial freshwater flows and their relevance for the agricultural sector are described in more detail in [[Water]].  
 
Agriculture, terrestrial carbon, water and nutrient cycles were separate modules in previous versions of IMAGE and thus interactions were not adequately covered. IMAGE 3.0 covers natural and agricultural terrestrial ecosystems, and associated carbon and water dynamics via the link with the dynamic global vegetation, agriculture and water balance model [[LPJmL  model|LPJmL]] (Lund-Potsdam-Jena model with managed Land; [[Sitch et al., 2003]]; [[Gerten et al., 2004]]; [[Bondeau et al., 2007]]). This enables more detailed and process-based representation of the interacting dynamics in vegetation, carbon and agricultural production, and extends the model scope to terrestrial freshwater dynamics.
 
LPJmL is one of the most extensively evaluated dynamic global vegetation models ({{abbrTemplate|DGVM}}) and is widely applied either separately or linked to other models. To show the complex dynamics in the terrestrial biosphere and to reflect the historical IMAGE modules, LPJmL is described in three components: [[Carbon cycle and natural vegetation|carbon cycle and vegetation]]; [[Crops and grass|agricultural land use]]; and [[Water|terrestrial freshwater flows]].
 
IMAGE 3.0 and LPJmL are linked through an interface that enables close and consistent interaction between the two models in annual time steps. An even more direct link to simulate detailed land-atmosphere interaction would require higher temporal resolutions also in other IMAGE components (e.g., the climate model), which is not necessarily congruent with the philosophy of an integrated assessment model. Incorporating nutrient cycles and improving representations of grassland management in LPJmL will require further adjustments to other IMAGE 3.0 components, and will increase consistency.


Technically, IMAGE 3.0 and LPJmL are linked through an interface that passes relevant information between the two models in time steps of one year; allowing for close and consistent interaction between them. An even more  direct coupling (e.g. needed to simulate the land-atmosphere interaction in more detail) would require much higher temporal resolutions also in other parts of the model (e.g. the climate module), which is not necessarily congruent with the modelling philosophy of an integrated assessment model. However, the current level of model coupling is not the final stage anticipated here. Ongoing work on implementing nutrient cycles and improved representations of grassland management in LPJmL not only will require further adjustments to other modules of IMAGE 3.0, but will also allow for higher consistency between the modules.
|FrameworkElementType=state component
|FrameworkElementType=state component
|ComponentCode=VHA
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Revision as of 10:30, 17 May 2014

Composition of Carbon, vegetation, agriculture and water

  1. Carbon cycle and natural vegetation
  2. Crops and grass
  3. Water
link to framework components overview
Key publications

Description of Carbon, vegetation, agriculture and water

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