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Detecting vegetation-precipitation feedbacks in mid-Holocene North Africa from two climate models

Description: Using two climate-vegetation model simulations from the Fast Ocean Atmosphere Model (FOAM) and the Community Climate System Model (CCSM, version 2), we investigate vegetation-precipitation feedbacks across North Africa during the mid-Holocene. From mid-Holocene snapshot runs of FOAM and CCSM2, we detect a negative feedback at the annual timescale with our statistical analysis. Using the Monte- Carlo bootstrap method, the annual negative feedback is further confirmed to be significant in both si… more
Date: March 31, 2008
Creator: Wang, Yi; Notaro, Michael; Liu, Zhengyu; Gallimore, Robert; Levis, Samuel & Kutzbach, John E.
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Partner: UNT Libraries Government Documents Department
open access

GROW1: a crop growth model for assessing impacts of gaseous pollutants from geothermal technologies

Description: A preliminary model of photosynthesis and growth of field crops was developed to assess the effects of gaseous pollutants, particularly airborne sulfur compounds, resulting from energy production from geothermal resources. The model simulates photosynthesis as a function of such variables as irradiance, CO/sub 2/ diffusion resistances, and internal biochemical processes. The model allocates the products of photosynthesis to structural (leaf, stem, root, and fruit) and storage compartments of th… more
Date: March 17, 1977
Creator: Kercher, J.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comparison of ground-derived and satellite-derived surface energy fluxes from a shrub-steppe site

Description: Efforts to measure evapotranspiration (ET) remotely are common in agriculture, and the application of such data to irrigation scheduling is readily apparent. Extending this methodology to arid environments is primarily of use as a mechanism for validation of ET algorithms used in large-scale watershed and global climate change modeling efforts. To facilitate testing of the remote sensing method for ET, measurements of sensible and latent heat flux were made at four sites located on the US Depar… more
Date: March 1, 1994
Creator: Kirkham, R. R.; Gee, G. W. & Fritschen, L. J.
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Partner: UNT Libraries Government Documents Department
open access

Variation in soil moisture and N availability modulates carbon and water exchange in a California grassland experiment

Description: Variability in the magnitude and timing of precipitation is predicted to change under future climate scenarios. The primary objective of this study was to understand how variation in precipitation patterns consisting of soil moisture pulses mixed with intermittent dry down events influence ecosystem gas fluxes. We characterized the effects of precipitation amount and timing, N availability, and plant community composition on whole ecosystem and leaf gas exchange in a California annual grassland… more
Date: March 15, 2009
Creator: Clair, S.B., St.; Sudderth, E.; Fischer, M. L.; Torn, M. S.; Stuart, S.; Salve, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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