Tracy Twine

Associate Professor

568 Borlaug Hall
1991 Upper Buford Circle
St. Paul, MN 55108
twine@umn.edu
+1 612 625 7278

Website(s)

Biosphere-Atmosphere Interactions

Education

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

Affiliated Graduate Programs

Land and Atmospheric Science
Picture of Tracy Twine

People

Research Area(s)

Atmosphere-Biosphere Interactions
Climate and Climate Change
Ecosystem Modeling

Areas of Interest

I study how human land use and climate affect the structure and functioning of natural and managed ecosystems. I use numerical models to predict how forests, grasslands, and croplands respond to changes in climate means as well as extreme weather (e.g., droughts) and increases in greenhouse gas concentrations. I am currently predicting how the conversion of current cropland for bioenergy production could impact water resources. I'm also focusing on Minnesota to evaluate locations that are currently threatened for water shortages or may become threatened with future climate change. I have also been comparing the urban heat islands of the top 100 most populous cities around the world, and have been characterizing the urban heat island of the Minneapolis-Saint Paul metropolitan region with the goal of mitigating urban warming to develop cities that are best able to adapt to climate change.

Teaching

  • ESPM 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

Select Publications

  • Harding, K.J., T. E. Twine, A. VanLoocke, J. E. Bagley, and J. Hill. 2016. Impacts of second-generation biofuel feedstock production in the central U.S. on the hydrologic cycle and global warming mitigation potential. Geophysical Research Letters, 43, doi:10.1002/2016GL069981.
  • Mykleby, P.M., J. D. Lenters, G. T. Cutrell, K. S. Herrman, E. Istanbulluglu, D. T. Scott, T. E. Twine, C. J. Kucharik, T. Awada, M. E. Soylu, B. Dong. 2016. Energy and water balance response of a vegetated wetland to herbicide treatment of invasive Phragmites Australis, Journal of Hydrology, doi:10.1016/j.jhydrol.2016.05.015.
  • VanLoocke, A., T. E. Twine, C. J. Kucharik, C. J. Bernacchi. 2016. Assessing the potential to decrease the Gulf of Mexico hypoxic zone with Midwest US perennial cellulosic feedstock production. Global Change Biology-Bioenergy, doi:10.1111/gcbb.12385.
  • Xu, H., T.E. Twine, and E. Girvetz. 2016. Climate change and maize yield in Iowa. PLoSONE 11(5):e0156083. Doi: 10.1371/journal.pone.0156083.
  • Harding, K., T.E. Twine, and Y. Lu. Effects of dynamic crop growth on the simulated precipitation response to irrigation. 2015. Earth Interactions special issue on Biogeophysical Climate Impacts of Land Use and Land Cover Change, 19, paper no. 14. Doi: 10.1175/EI-D-150030.1.
  • Smoliak, B. V., P. K. Snyder, T. E. Twine, W. F. Hertel, P. M. Mykleby. 2015. Dense network sampling of the Twin Cities canopy layer urban heat island. Journal of Applied Meteorology and Climatology. doi: http://dx.doi.org/10.1175/JAMC-D-14-0239.1.
  • Ummenhofer, C., H. Xu, T. Twine, E. Girvetz, H. McCarthy, N. Chhetri, and K. Nicholas. 2015. How climate change affects extremes in maize and wheat yield in two cropping regions. Journal of Climate, 28, 4653-4687, doi:10.1175/JCLI-D-13-00326.1.
  • Vashisht, B. B., T. Nigon, D. J. Mulla, C. Rosen, H. Xu, T. Twine, and S. K. Jalota. 2015. Adaptation of water and nitrogen management to future climates for sustaining potato yield in Minnesota: Field and simulation study. Agricultural Water Management, 152, 198-206, doi:10.1016/j.agwat.2015.01.011.
  • 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.