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
SOIL 5480 : 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., 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.

Lyon, S., F. Dominguez, D. Gochis, N. Brunsell, C. Castro, F. Chow, Y. Fan, D. Fuka, Y. Hong, P. Kucera, S. Nesbitt, N. Salzmann, J. Schmidli, P. Snyder, A. Teuling, T. Twine, S. Levis, J. Lundquist, G. Salvucci, A. Sealy, and M. Walter, 2008. Coupling terrestrial and atmospheric water dynamics to improve prediction in a changing environment. Bulletin of the American Meteorological Society, 89:9, 1275-1279.

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.

Foley, J. A., C. J. Kucharik, T. E. Twine, M. T. Coe, and S. D. Donner, 2004. Land use, land cover, and climate change across the Mississippi basin: Impacts on selected land and water resources. Ecosystems and Land Use Change. R. DeFries, G. Asner, and R. Houghton, Eds., American Geophysical Union, 308p., doi:10.1029/153GM19.

Donner, S. D., M. T. Coe, J. D. Lenters, T. E. Twine, and J. A. Foley, 2002. Modeling the impact of hydrological changes on nitrate transport in the Mississippi River Basin from 1955 to 1994. Global Biogeochemical Cycles, 16(3), 1043, doi:10.1029/2001GB001396.

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.