Description, calibration and sensitivity analysis of the local ecosystem submodel of a global model of carbon and nitrogen cycling and the water balance in the terrestrial biosphere
We have developed a geographically-distributed ecosystem model for the carbon, nitrogen, and water dynamics of the terrestrial biosphere TERRA. The local ecosystem model of TERRA consists of coupled, modified versions of TEM and DAYTRANS. The ecosystem model in each grid cell calculates water fluxes...
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ftosti:oai:osti.gov:198872 2023-07-30T04:07:21+02:00 Description, calibration and sensitivity analysis of the local ecosystem submodel of a global model of carbon and nitrogen cycling and the water balance in the terrestrial biosphere Kercher, J.R. Chambers, J.Q. | 2014-10-10 application/pdf http://www.osti.gov/servlets/purl/198872 https://www.osti.gov/biblio/198872 https://doi.org/10.2172/198872 unknown http://www.osti.gov/servlets/purl/198872 https://www.osti.gov/biblio/198872 https://doi.org/10.2172/198872 doi:10.2172/198872 54 ENVIRONMENTAL SCIENCES TERRESTRIAL ECOSYSTEMS BIOGEOCHEMISTRY T CODES DESIGN CARBON CYCLE NITROGEN CYCLE MOISTURE SEASONAL VARIATIONS CLIMATIC CHANGE 2014 ftosti https://doi.org/10.2172/198872 2023-07-11T08:31:42Z We have developed a geographically-distributed ecosystem model for the carbon, nitrogen, and water dynamics of the terrestrial biosphere TERRA. The local ecosystem model of TERRA consists of coupled, modified versions of TEM and DAYTRANS. The ecosystem model in each grid cell calculates water fluxes of evaporation, transpiration, and runoff; carbon fluxes of gross primary productivity, litterfall, and plant and soil respiration; and nitrogen fluxes of vegetation uptake, litterfall, mineralization, immobilization, and system loss. The state variables are soil water content; carbon in live vegetation; carbon in soil; nitrogen in live vegetation; organic nitrogen in soil and fitter; available inorganic nitrogen aggregating nitrites, nitrates, and ammonia; and a variable for allocation. Carbon and nitrogen dynamics are calibrated to specific sites in 17 vegetation types. Eight parameters are determined during calibration for each of the 17 vegetation types. At calibration, the annual average values of carbon in vegetation C, show site differences that derive from the vegetation-type specific parameters and intersite variation in climate and soils. From calibration, we recover the average C{sub v} of forests, woodlands, savannas, grasslands, shrublands, and tundra that were used to develop the model initially. The timing of the phases of the annual variation is driven by temperature and light in the high latitude and moist temperate zones. The dry temperate zones are driven by temperature, precipitation, and light. In the tropics, precipitation is the key variable in annual variation. The seasonal responses are even more clearly demonstrated in net primary production and show the same controlling factors. Other/Unknown Material Tundra SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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Open Polar |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES TERRESTRIAL ECOSYSTEMS BIOGEOCHEMISTRY T CODES DESIGN CARBON CYCLE NITROGEN CYCLE MOISTURE SEASONAL VARIATIONS CLIMATIC CHANGE |
spellingShingle |
54 ENVIRONMENTAL SCIENCES TERRESTRIAL ECOSYSTEMS BIOGEOCHEMISTRY T CODES DESIGN CARBON CYCLE NITROGEN CYCLE MOISTURE SEASONAL VARIATIONS CLIMATIC CHANGE Kercher, J.R. Chambers, J.Q. | Description, calibration and sensitivity analysis of the local ecosystem submodel of a global model of carbon and nitrogen cycling and the water balance in the terrestrial biosphere |
topic_facet |
54 ENVIRONMENTAL SCIENCES TERRESTRIAL ECOSYSTEMS BIOGEOCHEMISTRY T CODES DESIGN CARBON CYCLE NITROGEN CYCLE MOISTURE SEASONAL VARIATIONS CLIMATIC CHANGE |
description |
We have developed a geographically-distributed ecosystem model for the carbon, nitrogen, and water dynamics of the terrestrial biosphere TERRA. The local ecosystem model of TERRA consists of coupled, modified versions of TEM and DAYTRANS. The ecosystem model in each grid cell calculates water fluxes of evaporation, transpiration, and runoff; carbon fluxes of gross primary productivity, litterfall, and plant and soil respiration; and nitrogen fluxes of vegetation uptake, litterfall, mineralization, immobilization, and system loss. The state variables are soil water content; carbon in live vegetation; carbon in soil; nitrogen in live vegetation; organic nitrogen in soil and fitter; available inorganic nitrogen aggregating nitrites, nitrates, and ammonia; and a variable for allocation. Carbon and nitrogen dynamics are calibrated to specific sites in 17 vegetation types. Eight parameters are determined during calibration for each of the 17 vegetation types. At calibration, the annual average values of carbon in vegetation C, show site differences that derive from the vegetation-type specific parameters and intersite variation in climate and soils. From calibration, we recover the average C{sub v} of forests, woodlands, savannas, grasslands, shrublands, and tundra that were used to develop the model initially. The timing of the phases of the annual variation is driven by temperature and light in the high latitude and moist temperate zones. The dry temperate zones are driven by temperature, precipitation, and light. In the tropics, precipitation is the key variable in annual variation. The seasonal responses are even more clearly demonstrated in net primary production and show the same controlling factors. |
author |
Kercher, J.R. Chambers, J.Q. | |
author_facet |
Kercher, J.R. Chambers, J.Q. | |
author_sort |
Kercher, J.R. |
title |
Description, calibration and sensitivity analysis of the local ecosystem submodel of a global model of carbon and nitrogen cycling and the water balance in the terrestrial biosphere |
title_short |
Description, calibration and sensitivity analysis of the local ecosystem submodel of a global model of carbon and nitrogen cycling and the water balance in the terrestrial biosphere |
title_full |
Description, calibration and sensitivity analysis of the local ecosystem submodel of a global model of carbon and nitrogen cycling and the water balance in the terrestrial biosphere |
title_fullStr |
Description, calibration and sensitivity analysis of the local ecosystem submodel of a global model of carbon and nitrogen cycling and the water balance in the terrestrial biosphere |
title_full_unstemmed |
Description, calibration and sensitivity analysis of the local ecosystem submodel of a global model of carbon and nitrogen cycling and the water balance in the terrestrial biosphere |
title_sort |
description, calibration and sensitivity analysis of the local ecosystem submodel of a global model of carbon and nitrogen cycling and the water balance in the terrestrial biosphere |
publishDate |
2014 |
url |
http://www.osti.gov/servlets/purl/198872 https://www.osti.gov/biblio/198872 https://doi.org/10.2172/198872 |
genre |
Tundra |
genre_facet |
Tundra |
op_relation |
http://www.osti.gov/servlets/purl/198872 https://www.osti.gov/biblio/198872 https://doi.org/10.2172/198872 doi:10.2172/198872 |
op_doi |
https://doi.org/10.2172/198872 |
_version_ |
1772820606768644096 |