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ORCA Project

The project tests and demonstrates the bottom-up and top-down paradigm of the North American Carbon Program. To quantify and understand the carbon budgets of Oregon and northern California, a spatially nested hierarchy of field and satellite remote sensing observations is combined with a widely-used prognostic model of terrestrial carbon exchange (Biome-BGC) to implement a "bottom-up" approach that we previously tested in western OR coniferous forests. The "top-down" approach for regional and global applications uses a model-data fusion scheme to estimate monthly NEP and to partition it among gross primary production, autotrophic respiration, and heterotrophic respiration. The approaches will be compared and evaluated to make improvements and provide critical understanding of major uncertainties about the carbon cycle.

Links:

http://terraweb.forestry.oregonstate.edu/orca.htm

Documents:

- Turner, D.P., Ritts, D., Yang, Z., Kennedy, R.E., Cohen, W.B., Duane, M.V., Law, B.E. 2011. Decadal Trends in Net Ecosystem Production and Net Ecosystem Carbon Balance for a regional socioecological system. Forest Ecology and Management 262:1318-1325.
- Meigs, G.W., Turner, S.P., Ritts, W.D., Yang Z., Law, B.E. 2011. Detection and simulation of heterogeneous fire effects on pyrogenic carbon emissions, tree mortality, and net ecosystem production. Ecosystems 14:758-775.
- Turner, D.P., Göckede, M., Law, B.E., Ritts, W.D., Cohen, W.B., Yang, Z., Hudiburg, T., Kennedy, R., Duane, M. 2011. Multiple constraint analysis of regional land surface carbon flux. TellusB 63:207-221.
- Göckede, M., Turner, D.P., Michalak, A.M., Vickers, D. and Law, B.E. 2010. Sensitivity of a subregional scale atmospheric inverse CO2 modeling framework to boundary conditions, Journal of Geophysical Research - Atmosphere 115, D24112, doi:10.1029/2010JD014443.
- Duane, M.V., Cohen, W.B., Campbell, J.L., Hudiburg, T., Turner, D.P., Weyermann, D. 2010. Implications of alternative field-sampling designs on Landsat-based mapping of stand age and carbon stocks in Oregon forests. Forest Science 56: 405-416.
- Göckede, M., Michalak, A., Vickers, D., Turner, D., Law, B. 2010. Atmospheric inverse modeling to constrain regional scale CO2 budgets at high spatial and temporal resolution. Journal of Geophysical Research – Atmosphere 115, D15113.
- Hudiburg, T., Law, B., Turner, D.P., Campbell, J., Donato, D., Duane, M. 2009. Carbon dynamics of Oregon and Northern California forests and potential land-based carbon storage. Ecological Applications 19:163-180
- Turner, D.P., Ritts, W.D., Law, B.E., Cohen, W.B., Yang, Z., Hudiburg, T., Campbell, J.L., Duane, M. 2007. Scaling net ecosystem production and net biome production over a heterogeneous region in the western United States. Biogeosciences 4:597-612
- Turner, D.P., W.D. Ritts, J.M. Styles, Z. Yang, W.B. Cohen, B.E. Law, and P. Thornton. 2006. A diagnostic carbon flux model to monitor the effects of disturbance and interannual variation in climate on regional NEP. Tellus 58B:476-490.
- Law, B.E., Turner, D.P., Lefsky, M., Campbell, J., Guzy, M., Sun, O., Van Tuyl, S., Cohen, W.B. 2006. Carbon fluxes across regions: observational constraints at multiple scales. In J.Wu, B. Jones, H. Li, O. Loucks, eds. Scaling and Uncertainty Analysis in Ecology: Methods and Applications. Columbia University Press. New York, USA.
- Van Tuyl, S., Law, B.E., Turner, D.P., Gitelman, A.I. 2005. Variability in net primary production and carbon storage in biomass across Oregon forests – an assessment integrating data from forest inventories, intensive sites, and remote sensing. Forest Ecology and Management 209:273-291.
- Lefsky, M.A., Turner, D.P., Guzy, M., Cohen, W.B. 2005. Combining lidar estimates of biomass and Landsat estimates of stand age for spatially extensive validation of modeled forest productivity. Remote Sensing of Environment 95:549-558.
- Turner, D.P., Ollinger, S.V., Kimball, J.S. 2004. Integrating remote sensing and ecosystem process models for landscape to regional scale analysis of the carbon cycle. BioScience 54:573-584.
- Turner, D.P., Guzy, M., Lefsky, M., Ritts, W., VanTuyl, S., Law, B.E. 2004. Monitoring forest carbon sequestration with remote sensing and carbon cycle modeling. Environmental Management 33:457-466.
- Law, B.E., Turner, D., Campbell, J., Sun, O., Van Tuyl, S., Ritts, W.D., Cohen, W. 2004. Disturbance and climate effects on carbon stocks and fluxes across western Oregon USA. Global Change Biology 10:1-16.