Prof. Dr. Johanna Baehr

Head of the Research Group Climate System Data Assimilation
CliSAP/CEN, Universität Hamburg

Institute of Oceanography (IfM), Room 343
Bundesstraße 53, 20146 Hamburg
Tel.: +49 40 42838 7736
Fax: +49 40 42838 7471


I am interested in the large-scale ocean circulation, and its role in the climate system. As a tool, I employ numerical models to study the timescales of variability of oceanic quantities. Recently, I have been focusing on the prediction of the ocean circulation on seasonal to decadal timescales. I have also been working on model-based design studies for the observing system required to facilitate the detection of changes in the ocean circulation, and the Atlantic meridional overturning circulation in particular.

01/2009 - present Junior Professorship for Climate System Data Assimilation

01/2007 - 12 /2008 Post-doctoral associate at the Massachusetts Institute of Technology, Cambridge, MA (USA), advisor: Carl Wunsch

2006 Dr. rer. nat., University of Hamburg (Germany)

2003 - 2006 PhD student at the Max Planck Institute for Meteorology, Hamburg (Germany), advisor: Jochem Marotzke

2002 - 2003 PhD student at the Southampton Oceanography Centre, Southampton (UK), advisor: Jochem Marotzke

2002 MSc in Oceanography, University of Southampton (UK)

1996 - 2002 Diplom course in physical oceanography, University of Kiel (Germany)

Submitted manuscripts

Müller, V., H. Pohlmann, D. Matei, J. Marotzke, W.A. Müller, M. Zeller, J. Baehr: Hindcast skill for the Atlantic meridional overturning circulation at 26.5°N within two MPI-ESM decadal climate prediction systems, submitted to Climate Dynamics

Fischer, M., D.I.V .Domeisen, W.A. Müller, J. Baehr: The Atlantic meridional heat transport seasonal cycle in a CMIP5 climate projection, submitted to Journal of Climate

Gosh, R., W. A. Müller, J. Baehr, J. Baader: Impact of observed North Atlantic multidecadal variations to European summer climate: A quasi-geostrophic pathway, submitted to Climate Dynamics

Bunzel, F., Notz, D., Baehr, J., W.A. Müller, Fröhlich, K.,: Observational uncertainty of Arctic sea-ice concentration significantly affects seasonal climate forecasts, submitted to Geophysical Research Letters

Peer-reviewed publications

Brune, S., Nerger, L. & Baehr, J. (2015). Assimilation of oceanic observations in a global coupled Earth system model with the SEIK filter, Ocean Modelling, 96 (2), 254-264, doi:10.1016/j.ocemod.2015.09.011.

Baehr, J., Fröhlich, K., Botzet, M., Domeisen, D., Kornblueh, L., Notz, D., Piontek, R., Pohlmann, H., Tietsche, S., & Müller, W. A. (2015). The prediction of surface temperature in the new seasonal prediction system based on the MPI-ESM coupled climate model. Climate Dynamics, 44, 2723-2735, doi:10.1007/s00382-014-2399-7.

Dobrynin, M., Murawski, J., Baehr, J., & Ilyina, T. (2015). Detection and attribution of climate change signal in ocean wind waves. Journal of Climate, 28, 1578-1591, doi:10.1175/JCLI-D-13-00664.

Domeisen, D., Butler, A., Fröhlich, K., Bittner, M., Müller, W. A., & Baehr, J. (2015). Seasonal predictability over Europe arising from El Niño and stratospheric variability in the MPI-ESM seasonal prediction system. Journal of Climate, 28, 256-271, doi:10.1175/JCLI-D-14-00207.1.

Baehr, J., & Piontek, R. (2014). Ensemble initialization of the oceanic component of a coupled model through bred vectors at seasonal-to-interannual timescales. GEOSCIENTIFIC MODEL DEVELOPMENT, 7(1), 453-461, doi:10.5194/gmd-7-453-2014.

Tiedje, B. and J. Baehr: Limitations of the potential predictability of meridional mass and heat transports in the North Atlantic, Geophysical Research Letters, 41(12), 4270-4276, doi: 10.1002/2014GL060174.

Fischer, M., A. Biastoch, E. Behrens, J. Baehr, 2013: Simulations of a line W based observing system for the Atlantic Meridional Overturning circulation, Ocean Dynamics, doi: 10.1007/s10236-013-0632-2.

Brüdgam, M., C. Eden, L. Czeschel, J. Baehr, 2013: The ability of the adjoint technique to recover decadal variability of the North Atlantic circulation, Ocean Modelling, doi: 10.1016/j.ocemod.2013.06.006.

Mielke, C., E. Frajka-Williams, J. Baehr, 2013: Observed and simulated variability of the AMOC at 26N and 41N, Geophysical Research Letters, 40(6), 1159-1164.

Tiedje, B., A. Köhl, J. Baehr, 2012, Potential predictability of the North Atlantic heat transport based on an oceanic state estimate, Journal of Climate, 25, 8475-8486.

Müller, W. A., J. Baehr, H. Haak, J. H. Jungclaus, J. Kröger, D. Matei, D. Notz, H. Pohlmann, J. S. v. Storch, J. Marotzke, 2012, Forecast skill of multi-year seasonal means in the decadal prediction system of the Max Planck Institute for Meteorology, Geophysical Research Letters, 39, L22707.

Matei, D., J. Baehr, J. H. Jungclaus, H. Haak, W. A. Mueller, and J. Marotzke, 2012: Response to Comment on "Multiyear Prediction of Monthly Mean Atlantic Meridional Overturning Circulation at 26.5 degrees N". Science, 338, doi: 10.1126/science.1223200.

Matei, D., J. Baehr, J. H. Jungclaus, H. Haak, W. A. Müller, J. Marotzke, 2012, Multiyear prediction of monthly mean Atlantic Meridional Overturning Circulation at 26.5°N, Science, 335, 76-79.

Baehr, J., 2011, An observation-based detection variable for the meridional overturning circulation at 26N in the Atlantic, Deep Sea Research II, US-AMOC Special Issue, 58 (17-18), 1833-1836.

Baehr, J., 2010, Influence of the RAPID/MOCHA and Florida Current Cable data on the ECCO-GODAE ocean state estimate, Journal of Physical Oceanography, 40, 865-879.

Baehr, J., S. Cunningham, H. Haak, P. Heimbach, T. Kanzow, J. Marotzke, 2009, Observed and simulated daily variability of the meridional overturning circulation at 26.5°N in the Atlantic,Ocean Science, 5, 575-589.

Baehr, J., A. Stroup, J. Marotzke, 2009, Testing concepts for continuous monitoring of the meridional overturning circulation in the South Atlantic, Ocean Modelling, 29, 147-153.

Cunningham, S., M. Baringer, B. Johns, J. Toole, S. Østerhus, J. Fischer, A. Piola, E. McDonagh, S. Lozier, U. Send, T. Kanzow, J. Marotzke, M. Rhein, S. Garzoli, S. Rintoul, B. Sloyan, S. Speich, L. Talley, J. Baehr, C. Meinen, A.-M. Treguier, and P. Lherminier, 2009: The present and future system for measuring the Atlantic meridional overturning circulation and heat transport. Proceedings of OceanObs’09: Sustained Ocean Observations and Information for Society (Vol. 2), Venice, Italy, 21-25 September 2009, ESA Publication WPP-306. pdf (2.1 MB)

Heimbach, P., G. Forget, R.M. Ponte, C.Wunsch, M. Balmaseda, T. Awaji, J. Baehr, D. Behringer, J. Carton, N. Ferry, A. Fischer, I. Fukumori, B. Giese, K. Haines, E. Harrison, F. Hernandez, M. Kamachi, C. Keppenne, A. Koehl, T. Lee, D. Menemenlis, P. Oke, E. Remy, M. Rienecker, A. Rosati, D. Smith, K. Speer, D. Stammer, A.Weaver, 2009: Observational Requirements for Global-Scale Ocean Climate Analysis: Lessons from Ocean State Estimation. Proceedings of OceanObs’09: Sustained Ocean Observations and Information for Society (Vol. 2), Venice, Italy, 21-25 September 2009, ESA Publication WPP-306. pdf (0.6 MB)

Baehr, J., K. Keller, J. Marotzke, 2008, Detecting potential changes in the meridional overturning circulation at 26°N in the Atlantic. Climatic Change, 91, 11-27, doi: 10.1007/s10584-006-9153-z.

Baehr, J., D. McInerney, K. Keller, J. Marotzke, 2008, Optimization of an observing system design for the North Atlantic meridional overturning circulation, Journal of Atmospheric and Oceanic Technology, 25 (4), 625-634.

Keller, K., S.-R. Kim, J. Baehr, D. F. Bradford, M. Oppenheimer, 2007, What is the economic value of information about climate thresholds? In: "Human Induced Climate Change: An Interdisciplinary Assessment", editors: M. Schlesinger, H. S. Kheshgi, J. B. Smith, F. C. de la Chesnaye, J. M. Reilly, T. Wilson, C. Kolstad, Cambridge University Press, 343-354.

Baehr, J., H. Haak, S. Alderson, S. A. Cunningham, J. H. Jungclaus, J. Marotzke, 2007, Timely detection of changes in the meridional overturning circulation at 26°N in the Atlantic, Journal of Climate, 20 (23), 5827–5841.

Baehr, J., J. Hirschi, J.-O. Beismann, J. Marotzke, 2004, Monitoring the meridional overturning circulation in the North Atlantic: A model-based array design study, Journal of Marine Research, 62 (3), 283-312.

Hirschi, J., J. Baehr, J. Marotzke, J. Stark, S. Cunningham, J.-O. Beismann, 2003, A monitoring design for the Atlantic meridional overturning circulation. Geophysical Research Letters, 30, 1413, doi: 10.1029/2002GL016776.

Non-peer-reviewed publications

Baehr, J. (Editor), 2011: How to survive your PhD – Essays from KlimaCampus Graduate Students. pdf (3 MB)

Baehr, J., 2006: Monitoring and detecting changes in the meridional overturning circulation at 26°N in the Atlantic Ocean - The simulation of an observing array in numerical models. Ph.D. thesis (University of Hamburg). Max Planck Institute for Meteorology, Reports on Earth System Science, No. 38, 133 p. pdf (28 MB)

Baehr, J., 2002, Monitoring meridional transports at 26°N in the Atlantic: A model-based design study, MSc Thesis (University of Southampton). pdf (5.0 MB)