Dr. Johengen is an Associate Research Scientist and Associate Director of the Cooperative Institute for Great Lakes Research (CIGLR), which is a NOAA Joint Institute program at the University of Michigan with the NOAA-Great Lakes Environmental Research Laboratory serving as the host lab. CIGLR's research activities are focused around five themes including: Climate and Large-Lake Dynamics, Coastal and Nearshore Processes, Lare-Lake Ecosystem Structure and Function, Remote Sensing, and Marine Environmental Engineering. Dr. Johengen's individual research interests focus on nutrient cycling and lower food-web dynamics in the Great Lakes, controlling the introduction of invasive species, and development of in situ water quality sensors and observing systems.
Current research projects include: NOAA-CSCOR, Impacts of multiple stressors on the Saginaw Bay, Lake Huron ecosystem; NOAA-IOOS, Alliance for Coastal Technologies; NOAA-IOOS, Implementation of the Great Lakes Observing System; USEPA, Monitoring Long-trem trends in the lower food web of the Great Lakes; GLFT, Examining Causes and Consequences of the decline of Diporeia in the Great Lakes.
Gobler, C.J., J.M. Burkholder, T.W. Davis, M.J. Harke, T. Johengen, C.A. Stow, D.B. Van de Waal (2016). The dual role of nitrogen supply in controlling the growth and toxicity of cyanobacterial blooms. Harmful Algae 54 (2016) 87-97.
Stumpf, R.P., T.W. Davis, T.T. Wynne, J.L. Graham, K.A. Loftin, T.H. Johengen, D. Gossiaux, D. Palladino, A. Burtner (2016). Challenges for mapping cyanobacteria toxin patterns with remotely sensed data. Harmful Algae 54 (2016) 160-173.
Reavie, E.D., M. Cai, M.R. Twiss, H.J. Carrick, T.W. Davis, T.H. Johengen, D. Gossiaux, D.E. Smith, D. Palladino, A. Burtner, G.V. Sgro (2016). Diatom production in Lake Erie is an important driver of summer hypoxia. J. Great Lakes Res. 42(3): 608-618.
Baskaran, M., T. Novell, K. Nash, S.A. Ruberg, B.A. Biddanda, T. Johengen, N. Hawley and J. V. Klump (2016). Tracing the Seepage of Subsurface Sinkhole Vent Waters into Lake Huron Using Radium and Stable Isotopes of Oxygen and Hydrogen. Aquatic Geochemistry 2016: 1- 26.
Drake, L.A., M.N. Tamburri, M.R. First, G.J. Smith, and T.H. Johengen (2014). How many organisms in ballast water discharge? A framework for validating and selecting compliance monitoring tools. Marine Pollution Bulletin, 86:122-128.
2014-2015 -NOAA-GLERL Ocean and Human Health Program (GLRI funded); Developing Predictive Models for Improving Coastal and Human Health and Beach Forecasting.
2014-2015 -NOAA IOOS Program; Alliance for Coastal Technologies.
2014-2015 -NOAA IOOS Program; Implementation of the Great Lakes Observing System (GLOS), 2011- 2016 (Year 4).
2014-2015 -NOAA-GLERL (GLRI funded): Implementation of the Great lakes Synthesis, Observations and Response System (SOAR).
2013-2014 -MARAD: Alliance for Coastal Technologies; Phase X Part 2, Evaluations of Fluorometers for use in Compliance Monitoring of Ballast Water Discharge Regulations.
PhD, University of Michigan (atmospheric and oceanic science)
MS, Florida State University (oceanography)
BS, Michigan State University (biology)
Board member of the Canadian Aquatic Invasive Species Network II (2011- present).
Committee member of Great Lakes Aquatic Nuisance Species Panel (2001 – present).