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 Metadata

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Title

  • Main 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

Creator

  • Author: Kercher, J. R.
    Creator Type: Personal
    Creator Info: Lawrence Livermore National Lab., CA (United States)
  • Author: Chambers, J. Q.
    Creator Type: Personal
    Creator Info: Lawrence Livermore National Lab., CA (United States)

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE, Washington, DC (United States)

Publisher

  • Name: Lawrence Livermore National Laboratory
    Place of Publication: California
    Additional Info: Lawrence Livermore National Lab., CA (United States)

Date

  • Creation: 1995-10-01

Language

  • English

Description

  • Content 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.
  • Physical Description: Medium: P; Size: 101 p.

Subject

  • Keyword: Climatic Change
  • Keyword: Biogeochemistry
  • Keyword: Terrestrial Ecosystems
  • Keyword: Seasonal Variations
  • Keyword: Carbon Cycle
  • STI Subject Categories: 54 Environmental Sciences
  • Keyword: Moisture
  • Keyword: T Codes
  • Keyword: Nitrogen Cycle
  • Keyword: Design

Source

  • Other Information: PBD: Oct 1995

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Other: DE96006017
  • Report No.: UCRL-ID--122634
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/198872
  • Office of Scientific & Technical Information Report Number: 198872
  • Archival Resource Key: ark:/67531/metadc671897

Note

  • Display Note: OSTI as DE96006017
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