IGB: Shallow Lakes and Lowland Rivers: Personnel

Departments / Limnology of Stratified Lakes

Dr. Klaus D. Jöhnk

IGB, Dept.3,
Limnology of Stratified Lakes
Alte Fischerhütte 2
OT Neuglobsow
D-16775 Stechlin

Fields of Interests:

Harmful algal blooms and climatic change Artificial mixing for bloom prevention Hydrogeochemistry of mining lakes
Chaos in ecology

Tel: +49 (0) 33082 699 54
Fax: +49 (0) 33082 699 17

k.joehnk@igb-berlin.de

Education and Employment	Series of Lectures
Research Interests	Publications
Researcher ID and Citation Metrics	News and Announcements

Education and Employment
since 2007	Postdoc, IGB Neuglobsow, Department of Limnology of Stratified Lakes - Dynamics of invasive cyanobacteria
2003-2007	Postdoc, Institute for Biodiversity and Ecosystem Dynamics/Aquatic Microbiology, University of Amsterdam, The Netherlands - Dynamics of toxic cyanobacteria in lakes; Artificial mixing of lakes
2001-2003	Research Scientist, Chair of Water Conservation, Brandenburg Technical University of Cottbus, Germany - Hydrodynamics of mining lakes
2000	Habilitation Thesis in Environmental Mechanics, TU Darmstadt 1D Hydrodynamical Models in Limnophysics - Turbulence, Meromixis, Dissolved Oxygen
1997-2001	Free consultant - Aquatic physics, lake hydrodynamics
1994-1997	Assistant Professor, Institute of Mechanics, Technical University of Darmstadt, Germany - Environmental mechanics
1991	PhD Thesis in Geophysics and Continuum Physics, TU Darmstadt Analytical and numerical calculations of the free oscillations of the Earth's outer core
1990-1991	Research scientist, Institute of Mechanics, Technical University of Darmstadt, Germany - Mixing processes and fluid motion in lakes
1986-1990	Research scientist, Geophysical Institute, Technical University of Karlsruhe, Germany - Free oscillations of the Earth's core
1986	Diploma Thesis in Geophysics Free oscillations of the Earth's rotating fluid outer core with respect to temperature structure and fluid motion
1978-1986	Studies in Geophysics at the Technical University of Karlsruhe

	to head of document

Research Interests

- Invasive species and climatic change
- Artificial mixing for bloom prevention
- Hydrogeochemistry of mining lakes
- Chaos in ecology

to head of document

Lectures

(view full list)

Lectures and courses in Limnology and Oceanography, Environmental Mechanics, Geophysics, Theoretical Physics, Continuum Mechanics, Numerical Mathematics.

to head of document

Publications

(view full list)

Books

Hutter, K., Jöhnk, K.D., 2004. Continuum methods of physical modeling – Continuum mechanics, dimensional analysis, turbulence. Springer, Berlin Heidelberg, pp. 635. (info)

Selected papers (2004-2008)

Benincà, E., Huisman, J., Heerkloss, R., Jöhnk, K.D., Branco, P., Van Nes, E.H., Scheffer, M., Ellner, S.P., 2008. Chaos in a long-term experiment with a plankton community. Nature 451: 822-825.(abstract)

Jöhnk, K.D., Huisman, J., Sommeijer, B., Sharples, J, Visser, P.M., Stroom, J., 2008. Summer heatwaves promote blooms of harmful cyanobacteria. Global Change Biology 14: 495-512.

Samal, N.R., Jöhnk, K.D., Peeters, F., Bäuerle, E., Mazumdar, A., 2008. Mixing and internal waves in a small stratified Indian Lake: Subhas Sarobar. In: Mohanty, P.K. (ed.) Monitoring and Modelling Lakes and Coastal Environments. Springer, Berlin, 248 p.

Ostendorp, W., Brem, H., Dienst, M., Jöhnk, K.D., Mainberger, M., Peintinger, M., Rey, P., Rossknecht, H., Schlichtherle, H., Straile, D., Strang, I., 2007. Auswirkungen des globalen Klimawandels auf den Bodensee (Impact of global climatic change on Lake Constance). Schriften des Vereins für die Geschichte des Bodensees und seiner Umgebung 125: 199-244. (in german)

Verspagen, J.M.H., Passarge, J., Jöhnk, K.D., Visser, P.M., Peperzak, L., Boerse, P., Laanbroek, H.J. and Huisman, J., 2006. Water management strategies against toxic Microcystis blooms in the Dutch delta. Ecological Applications 16: 313-327.

Jöhnk, K.D., 2005. Heat Balance of Open Water Bodies. In: Lehr, J.H. & Keeley, J. (eds.) Water Encyclopedia, Vol. 3: Surface and Agricultural Water, John Wiley & Sons Publ., pp. 190-193.

Verspagen, J.M.H., Snelder, E.O.F.M., Visser, P.M., Jöhnk, K.D., Ibelings, B.W., Mur, L.R., Huisman, J., 2005. Benthic - pelagic coupling in the population dynamics of the cyanobacterium Microcystis. Freshwater Biology 50: 854-867.

Nixdorf, B., Bäuerle, E., Heege, T., Hofmann, H., Jöhnk, K.D., Lessmann, D., Uhlmann, W. 2005. Mining lake Inden II – Development of water quality and resulting limnological characteristics. Brandenburg Technical University Cottbus, Report for Bezirksregierung Köln and RWE Power AG, 115 p. (in german)

Ostendorp, W., Schmieder, K., Jöhnk, K.D., 2004. Assessment of human pressures and hydromorphological impacts on lakeshores in Europe. Ecohydrology and Hydrobiology 4: 379-395.

Schmieder, K., Dienst, M., Ostendorp, W., Jöhnk, K.D., 2004. Effects of water level variations on the dynamics of the reed belts of Lake Constance. Ecohydrology and Hydrobiology 4: 469-480.

Jöhnk, K.D., Straile, D., Ostendorp, W., 2004. Extreme Floods at Lake Constance - Climate impact on lake shore biocoenosis in the light of the 1999 centennial flood. Limnologica 34: 15-21.

Jöhnk, K.D., Hofmann, H., Hemm, M., Lessmann, D., Nixdorf, B., 2004. Morphometry, hydrology and limnophysical modeling of mining pit lakes. In: Hüttl, R.F. & Gerwin, W. (eds.), Entwicklung und Bewertung gestörter Kulturlandschaften, Forschungszentrum Bergbaulandschaften, ISBN 3-937728-01-5, 331-357. (in german)

Hemm, M., Jöhnk, K.D., 2004. Database of lakes in Germany: Description and applications. Gewässerreport 8, BTUC-AR 3/2004, ISSN 1434-6834, 145-159. (in german)

Huisman, J., Jöhnk, K.D., 2004. Simulation of the population development of the toxic cyanobacterium Microcystis in Lake Nieuwe Meer under proposed heated water inflow scenarios. Reports 2-4 for NUON and IVL Svenska Miljöinstitutet AB.

Huisman, J., Jöhnk, K., Sommeijer, B., Sharples, J., Visser, P.M., Stroom, J., 2004. Intermittent Mixing in Lake Nieuwe Meer: Field Experiment and Model Simulations 2003. Report for Water board (Hoogheemraadschap) Rijnland, 71 p.

Schmieder K., Dienst, M., Jöhnk, K.D. & Ostendorp, W., 2004. Effects of the extreme flood 1999 on the reed belts of Lake Constance - Synthesis. German Society of Limnology (DGL), Köln, Germany, 29.9. – 3.10.2003, Conference proceedings, p. 536-541. (in german)

to head of document