Assessing regional net ecosystem production with diagnostic and prognostic modeling approaches

David Turner, Oregon State University, david.turner@oregonstate.edu (Presenter)
William Ritts, Oregon State University, david.ritts@oregonstate.edu
Mathias Goeckede, Oregon State University, mathias.goeckede@oregonstate.edu
Beverly Law, Oregon State University (OSU), bev.law@oregonstate.edu
Ramakrishna R. Nemani, NASA ARC, rama.nemani@nasa.gov

We evaluated multiple alternative scaling approaches for estimation of net ecosystem production (the balance of net primary production and heterotrophic respiration) over the west coast region of the United States. A diagnostic model (CFLUX) was applied at the 1 km resolution using MODIS FPAR and TOPS daily climatology. A prognostic model (Biome-BGC) was applied at Landsat resolution with full specification of stand history in the case of forests. Results of regional and global inversions analyses were also examined for the area and information from forest inventories, forest harvest, and crop harvests were used to independently estimate NEP. There was general agreement across approaches on the geographical distribution of high NEP sink areas, with relatively high values over croplands and coastal forests. The magnitude of the NEP sinks was higher with the inversion approach. Where stand age was represented in the diagnostic and prognostic modeling approaches, the areas of older forest stands had low NEP. Greatest proportional disagreement among the NEP estimates was for the drier eastern part of the study region.

Presentation Type:  Poster

Session:  Global Change Impact & Vulnerability   (Tue 11:30 AM)

Associated Project(s): 

• Turner, David: Assessing the Sensitivity of Net Ecosystem Exchange over North America to Climate and Disturbance with Prognostic and Diagnostic Models ...details

Poster Location ID: 290