University of Minnesota
College of Food, Agricultural and Natural Resource Sciences
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Department of Soil, Water, and Climate

Tracy Twine | 612-625-7278tracytwine

568 Borlaug Hall
1991 Upper Buford Circle
St Paul MN 55108


B.S. 1994 Pennsylvania State University Meteorology
M.S. 1998 University of Wisconsin - Madison Atmospheric and Oceanic Sciences
Ph.D. 2004 University of Wisconsin - Madison Atmospheric and Oceanic Sciences

I study how human land use and climate change affect the structure and functioning of natural and managed ecosystems. I am currently examining how climate change along with increasing carbon dioxide and ozone concentrations interact to affect agroecosystems.  In turn, agroecosystems influence regional energy, water, and carbon budgets. This work will help us predict how large-scale agriculture will respond to future environmental changes so that we can maintain food and water security. I am also studying the potential environmental impacts of biofuel energy crops on regional water budgets. This will help us determine which lands are best used for food or for alternative energy crops.

ESPM/GEOG 1425 : The Atmosphere
ESPM 4093/LAAS 8195 : Earth System Modeling
LAAS 5050 : Integrated Topics in Land and Atmospheric Science
SOIL 8110 : Topics in Land-Atmosphere Modeling

Graduate Program:
Soil Science
Land and Atmospheric Science

Selected Publications:
VanLoocke, A., T. E. Twine, M. Zeri, C. J. Bernacchi. 2012. A regional comparison of water use efficiency for miscanthus, switchgrass and maize, Agricultural and Forest Meteorology, 164, 82-95, doi:10.1016/j.agformet.2012.05.016.

Anderson-Teixeira, K. J., P. K. Snyder, T. E. Twine, S. V. Cuadra, M. H. Costa, E. H. DeLucia. 2012. Climate regulation services of natural and agricultural ecoregions of the Americas, Nature Climate Change, doi:10.1038/nclimate1346.

Powers, J.S., M.D. Corre, T.E. Twine, E. Veldkamp, 2011. Geographic bias of field observations of soil carbon stocks with tropical land-use changes precludes spatial extrapolation. Proceedings of the National Academy of Sciences, doi:10.1073/pnas.1016774108.

VanLoocke, A., C. J. Bernacchi, and T. E. Twine, 2010. The impacts of Miscanthus x giganteus production on the Midwest U.S. hydrologic cycle, Global Change Biology Bioenergy, 2, 180-191. doi: 10.1111/j.1757-1707.2010.01053.x.

Twine, T. E. and C. J. Kucharik. 2009. Climate impacts on net primary productivity trends in natural and managed ecosystems of the central and eastern United States. Agricultural and Forest Meteorology, doi:10.1016/j.agrformet.2009.05.012.

T. E. Twine and C. J. Kucharik. 2008. Evaluating a terrestrial ecosystem model with satellite information of greenness. Journal of Geophysical Research-Biogeosciences, 113, G03027, doi:10.1029/2007JG000599.

Kucharik, C. J. and T. E. Twine, 2007. Residue, respiration, and residuals: Evaluation of a dynamic agroecosystem model using eddy flux measurements and biometric data. Agricultural and Forest Meteorology, 146, 134-158.

Twine, T. E., C. J. Kucharik, and J. A. Foley, 2005. Effects of the El Niño-Southern Oscillation on the climate,water balance, and streamflow of the Mississippi River Basin. Journal of Climate, 18, 4840-4861.

Twine, T. E., C. J. Kucharik, and J. A. Foley, 2004. Effects of land cover change on the energy and water balance of the Mississippi River Basin. Journal of Hydrometeorology, 5, 640-655.

Twine, T. E., W. P. Kustas, J. M. Norman, D. R. Cook, P. R. Houser, T. P. Meyers, J. H. Prueger, P. J. Starks, and M. L. Wesely, 2000. Correcting eddy-covariance flux underestimates over a grassland. Agricultural and Forest Meteorology, 103(3), 279-300.