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

Tracy Twine | 612-625-7278SWAC - Tracy Twine 2

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 have used numerical models to examine how increases in carbon dioxide might interact with climate variability to affect soybean and corn yield across the US Midwest, and how these crops might change how they use water. I have also been evaluating different scenarios of planting crops and grasses for bioenergy and their effects on energy, water, and carbon budgets. In addition to agroecosystems, I am interested in how urban areas affect their surroundings and have been leading a study to measure the Twin Cities urban heat island through use of a dense network of temperature sensors.

ESPM/GEOG 1425: The Atmosphere
ESPM 4093/LAAS 8195: Earth System Modeling
LAAS 5050: Integrated Topics in Land and Atmospheric Science
LAAS 5051: Thesis Proposal Writing for Land & Atmospheric Science
SOIL 8110: Topics in Land-Atmosphere Modeling

Graduate Program:
Land and Atmospheric Science

Selected Publications:
Xu, H., T. E. Twine, X. Yang. 2014. Evaluating remotely sensed phenological metrics in a dynamic ecosystem model. Remote Sensing, 6(6), 4660-4686. doi:10.3390/rs6064660.

Drewniak, B., P. K. Snyder, A. Steiner, T. E. Twine, D. Wuebbles. 2014. Simulated changes in isoprene emissions from habitat expansion of Acer Rubrum (Red Maple), Environmental Research Letters, 9, 014006.

Steiner, A. L., D. Mermelstein, S. J. Cheng, T. E. Twine, A. Oliphant. 2013. Observed impact of atmospheric aerosols on the surface energy budget. Earth Interactions, 17, doi:10.1175/2013EI000523.1.

Twine, T. E., J. Bryant, K. Richter, C. J. Bernacchi, K. McConnaughay, S. Morris, and A. D. B. Leakey. 2013. Impacts of elevated CO2 concentration on the productivity and surface energy budget of the soybean and maize agroecosystems in the Midwest U.S.A. Global Change Biology, doi: 10.1111/gcb.12270.

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.