Dr. Hermann-Josef Lenhart

Center for Marine and Atmospheric Sciences

University of Hamburg
Institute of Oceanography
Bundesstr. 53, 3rd. floor
D-20146 Hamburg

Room:    351
Tel.: +49 (0)40 42838 5743
Fax:       +49 (0)40 42838 7485
email     Opens window for sending email hermann.lenhart@zmaw.de

Curriculum Vitae

Hermann-Josef Lenhart was born in Grevenbroich, near Cologne, on July 27, 1956. He studied physical Oceanography at the University of Hamburg and received his degree (Dipl. Oz.) in 1990.
His interest in ecological modelling led to an academic year in Canada as a visiting student at the Dalhousie University (Nova Scotia), followed by a practical training at the St. Andrews Biological Station (New Brunswick) in 1981.
Afterwards, he worked between 1985 to 1987 for the federal rivers and waters authorities in Hamburg. There he developed a program for aggregating Aanderaa current measurements of discharge rates in tidal rivers.
He continued his ecological studies with his graduation thesis on the phosphorus budget of the North Sea, based on a primary production model, and is included in the EC-project ERSEM (European Regional Seas Ecosystem Model). In the latter, he took responsibility for the preparation and application of the hydrodynamical model output into the box model, which eventually led to new calculations of the flushing times for the North Sea. Furthermore, he was involved in the compilation of the nutrient budgets within ERSEM as contribution to the LOICZ program.
In ERSEM II, he worked with a refined box model - the COCOA (Continental Coastal Application) version. In preparation for this study, the data of 10 continental rivers were aggregated from the respective national authorities and calculated as daily nutrient loads. In 1999 he received his PhD (Dr. rer. nat.) in the department of geoscience of the University of Hamburg. His work focusses on the modeling of the effects of reduction scenarios for anthropogenious river loads on the ecosystem of the North Sea. He has been participating in national project SYKON (synthesis and new conception of North Sea reseach).

Publications

Windhorst, W.; Colijn, F., Kabuta, S., Laane, R.P.W.M. & Lenhart, H., 2005.
Defining a good ecological status of coastal waters – a case study for the Elbe plume. In: Vermaat, J.E., Bouwer, L., Turner, K. & Salomons, W. (Eds.): Managing European Coasts, Springer Verlag, pp 59-74.

Hofmann, J., Behrendt, H., Gilbert, A., Jannssen, R., Kannen, A., Lenhart, H., Lise, W., Nunneri, C., & W. Windhorst, 2005.
Catchment-costal zone interaction based upon scenario and model analysis: Elbe and the German Bight case study. Regonal Environmental Change 5:54-81.

van Beusekom, J.; P. Bot, J. Göbel, M. Hanslik, H.-J. Lenhart , J. Pätsch, L. Peperzak, T. Petenali, K. Reise. 2005. Chapter 5: Eutrophication. in Essink, K., Dettmann,C., Laursen, k:, Lüerßen, G., Marencic, H. & Wiersinga, W. (eds.) Wadden Sea Quality Status Report 2004, Wadden Sea Ecosystems No. 19, Trilateral Monitoring and Assessmant Group, Common Wadden Sea Secretariat, Wilhelmshaven, Germany.

Pätsch, J. & H.-J. Lenhart, 2004.
Daily Loads of Nutrients, Total Alkalinity, Dissolved Inorganic Carbon and Dissolved Organic Carbon of the European continental rivers for the years 1977-2002. Berichte aus dem Zentrum für Meeres- und Klimaforschung; Reihe B: Ozeanographie, No 48, 159pp.

Lenhart, H.-J. & T. Pohlmann 2004.
North Sea Hydrodynamic Modelling: A Review. In: Kröncke, I. & Türkay, M. & J. Sündermann (eds), Senckenbergiana marit. 34(1/2), 53-88.

Brockmann, U., H. Lenhart , H. Schlünzen, & D.Topcu, D., 2002.
Nährstoffe und Eutrophierung In: Lozán, J. L., E. Rachor, K. Reise, J. Sündermann & H. v. Westernhagen (Hrsg.). Warnsignale aus Nordsee und Wattenmeer - Eine aktuelle Umweltbilanz. GEO, Hamburg. 61-76.

Brockmann, U., B. Heyden, M. Schütt, A. Starke, D. Topcu, K. Hesse, N. Ladwig, & H. Lenhart, 2002.
Assessment criteria for eutrophication areas - emphasis German Bight UBA Report, Umweltbundesamt Berlin 252 pp.

Lenhart, H.-J., 2001.
Effects of River Nutrient Load Reduction on the Eutrophication of the North Sea, Simulated with the Ecosystem Model ERSEM. In: Kröncke, I. & Türkay, M. & J. Sündermann (eds), Burning issues of North Sea ecology, Proceedings of the 14th international Senckenberg Conference North Sea 2000, Senckenbergiana marit. 31(2), 299-311.

Lenhart, H.-J. & J. Pätsch, 2001.
Daily nutrient loads of the European continental rivers for the years 1977-1998. Berichte aus dem Zentrum für Meeres- und Klimaforschung; Reihe B: Ozeanographie, No 40, 146pp.

Lenhart,H.-J., 1999.
Eutrophierung im kontinentalen Küstenbereich der Nordsee, Reduktionsszenarien der Flußeinträge von Nährstoffen mit dem Ökosystemmodell-ERSEM. Dissertation. Universität Hamburg, ZMK-Berichte B 35: 169 pp.

Lenhart, H.-J., G. Radach & P. Ruardij, 1997.
The effects of river input on the ecosystem dynamics in the continental coastal zone of the North Sea using ERSEM. J. Sea Res. 38: 249-274.

Lenhart, H.-J., & T. Pohlmann, 1997.
The ICES-boxes approach in relation to results of a North Sea circulation model. Tellus 49 A: 139-160.

Kühn, W., H. Lenhart, A. Moll, J. Pätsch & G. Radach, 1997.
Simulating the FLEX'76 situation using different plankton models. Berichte aus dem ZMK, Z 2: 145-148.

Lenhart, H.-J., J. Pätsch & G. Radach, 1996.
Daily nutrient loads for the European continental rivers during 1977 - 1993. Discharges and loads of rivers entering the North Sea. Technical Report. Berichte aus dem ZMK 22, 180 S.

Van den Berg, A.J., H. Ridderinkhof, R. Riegman, P. Ruardij & H. Lenhart, 1996.
Influence of variability in water transport on phytoplankton biomas and composition in the southern North Sea: a modelling approach (FYFY). Cont. Shelf Res. 16: 907-931.

Lenhart, H.J., G. Radach, J.O. Backhaus & T. Pohlmann, 1995.
Simulations of the North Sea circulation, its variability, and its implementation as hydrodynamical forcing in ERSEM. Neth. J. Sea Res. 33: 271-299.

Radach, G., & H.J. Lenhart, 1995.
Nutrient dynamics in the North Sea: Fluxes and budgets in the water derived from ERSEM. Neth. J. Sea Res. 33: 301-335.

Lenhart, H.-J., K. Herbig & I. Hufnagel, 1993.
Ein neues Schema für die ECOMOD - Datenbank. DGM-Mitteilungen 3/1993: 22-28.

Lenhart, H.-J., 1990.
Phosphatbilanz der Nordsee - Eine Abschätzung auf der Grundlage der ICES-Boxen. Diplomarbeit. Fachbereich Geowissenschaften der Universität Hamburg. Juni 1990. 111 S.

Radach, G., W. Schönfeld & H. Lenhart, 1990.
Nährstoffe in der Nordsee - Eutrophierung, Hypertrophierung und deren Auswirkungen. In: J. Lozan, W. Lenz, E. Rachor, H. v. Westernhagen, Watermann (Hrsg.): Warnsignale aus der Nordsee. Paul Parey Verlagsbuchhandlung, Hamburg - Berlin: 48-65.

Radach, G., H. Astheimer, M. Bohle-Carbonell, H. Lenhart, A. Moll, W. Schönfeld, 1988.
Marin-ökologische Simulation: ein Ansatz in der Umweltforschung. uni hh Forschung - Wissenschaftsberichte aus der Universität Hamburg XXII: 38-44.