Katja Lohmann


Email: katja.lohmann[at]mpimet.mpg.de

Phone: +49-40-41173-116

Fax: +49-40-41173-298

Room no.: ZMAW 206


Mailing Address

Max Planck Institute for Meteorology

Bundesstr. 53

D-20146 Hamburg




The Ocean in the Earth System


Research Group

Director's Research Group

Research Interests

Climate variability in the North Atlantic, with particular focus on the subpolar gyre and its exchanges with the Nordic Seas.


Lohmann, K. and M. Latif (2005): Tropical Pacific decadal variability and the subtropical-tropical cells. Journal of Climate, 18, 5163-5177

Lohmann, K. and M. Latif (2007): Influence of El Nino on the upper ocean circulation in the tropical Atlantic Ocean. Journal of Climate, 20, 5012-5018

Lohmann, K., H. Drange and M. Bentsen (2009a): Response of the North Atlantic subpolar gyre to persistent North Atlantic Oscillation like forcing. Climate Dynamics, 32, 273-285

Lohmann, K., H. Drange and M. Bentsen (2009b): A possible mechanism for the strong weakening of the North Atlantic subpolar gyre in the mid-1990s. Geophysical Research Letters, 36, L15602

Sando, A.B., J.E. Nilsen, Y.Q. Gao and K. Lohmann (2010): Importance of heat transport and local air-sea heat fluxes for Barents Sea climate variability. Journal of Geophysical Research, 115, C07013

Langehaug, H.R., P. Rhines, T. Eldevik, J. Mignot and K. Lohmann (2012): Simulated water mass transformation in the North Atlantic Current. Journal of Geophysical Research, 117, C11001

Menary, M., W. Park, K. Lohmann, M. Vellinga, M. Palmer, M. Latif and J.H. Jungclaus (2012): A multimodel comparison of centennial Atlantic meridional overturning circulation variability. Climate Dynamics, 38, 2377-2388

Nunez-Riboni, I., M. Bersch, H. Haak, J.H. Jungclaus and K. Lohmann (2012): A multi-decadal meridional displacement of the subpolar front in the Newfoundland Basin. Ocean Science, 8, 91-102

Robson, J., R. Sutton, K. Lohmann, D. Smith and M. Palmer (2012): Causes of the rapid warming of the North Atlantic Ocean in the mid-1990s. Journal of Climate, 25, 4116-4134

Zanchettin, D., C. Timmreck, H. Graf, A. Rubino, S. Lorenz, K. Lohmann, K. Krueger and J.H. Jungclaus (2012): Bi-decadal variability excited in the coupled ocean-atmosphere system by strong tropical volcanic eruptions. Climate Dynamics, 39, 419-444

Jungclaus, J.H., N. Fischer, H. Haak, K. Lohmann, J. Marotzke, D. Matei, U. Mikolajewicz, D. Notz and J.S. von Storch (2013): Characteristics of the ocean simulations in MPIOM, the ocean component of the MPI-Earth System Model. Journal of Advances in Modeling Earth Systems, 5, 422-446

Lohmann, K., J.H. Jungclaus, D. Matei, J. Mignot, M. Menary, H.R. Langehaug, J. Ba, Y.Q. Gao, O.H. Ottera, W. Park and S. Lorenz (2014): The role of subpolar deep water formation and Nordic Seas overflows in simulated multidecadal variability of the Atlantic meridional overturning circulation. Ocean Science, 10, 227-241

Ba, J., N. Keenlyside, M. Latif, W. Park, H. Ding, K. Lohmann, J. Mignot, M. Menary, O.H. Ottera, B. Wouters, D. Salas, A. Oka, A. Belluci and E. Volodin (2014): Multi-model comparison for North Atlantic multi-decadal variability. Climate Dynamics, 43, 2333-2348

Jungclaus, J.H., K. Lohmann and D. Zanchettin (2014): Enhanced 20th century heat transfer to the Arctic simulated in the context of climate variations over the last millennium. Climate of the Past, 10, 2201-2213

Lohmann, K., J. Mignot, H.R. Langehaug, J.H. Jungclaus, D. Matei, O.H. Ottera, Y.Q. Gao, T.L. Mjell, U.S. Ninnemann and H.F. Kleiven (2015): Using simulations of the last millennium to understand climate variability seen in paleo-observations: Similar variation of Iceland-Scotland overflow strength and Atlantic Multidecadal Oscillation. Climate of the Past, 11, 203-216

Gao, Y.Q., J. Sun, F. Li, S. He, S. Sandven, Q. Yan, Z. Zhang, K. Lohmann, N. Keenlyside, T. Furevik and L. Suo (2015): Arctic sea ice and Eurasian climate: A review. Advances in Atmospheric Sciences, 32, 92-114

Moreno-Chamarro, E., D. Zanchettin, K. Lohmann and J.H. Jungclaus (2015): Internally generated decadal cold events in the northern North Atlantic and their possible implications for the demise of the Norse settlements in Greenland. Geophysical Research Letters, 42, 908-915

Mueller, W.A., D. Matei, M. Bersch, J.H. Jungclaus, H. Haak, K. Lohmann, G. Compo, P.D. Sardeshmukh and J. Marotzke (2015): A 20th-century reanalysis forced ocean model to reconstruct North Atlantic multi-decadal climate variability from 1872-2010. Climate Dynamics, 44, 1935–1955

Hatun, H., K. Lohmann, D. Matei, J.H. Jungclaus, S. Pacariz, M. Bersch, A. Gislason, J. Olafsson and P.C. Reid (2016): An inflated subpolar gyre blows life toward the northeastern Atlantic. Progress in Oceanography, 147, 49-66

Langehaug, H.R., D. Matei, T. Eldevik, K. Lohmann and Y.Q. Gao (2017): On model differences and skill in predicting sea surface temperature in the Nordic and Barents Seas. Climate Dynamics, 48, 913-933

Moreno-Chamarro, E., D. Zanchettin, K. Lohmann and J.H. Jungclaus (2017): An abrupt weakening of the subpolar gyre as trigger of Little Ice Age-type episodes. Climate Dynamics, 48, 727-744

Moreno-Chamarro, E., D. Zanchettin, K. Lohmann, J. Luterbacher and J.H. Jungclaus (2017): Winter amplification of the European Little Ice Age cooling by the subpolar gyre. Nature Science Reports, 7, 9981

Gutjahr, O., D.A. Putrasahan, K. Lohmann, J.H. Jungclaus, J.S. von Storch, N. Brueggemann, H. Haak and A. Stoessel (2019): Max Planck Institute Earth System Model (MPI-ESM1.2) for the High-Resolution Model Intercomparison Project (HighResMIP). Geoscientific Model Development, 12, 3241-3281

Putrasahan, D.A., K. Lohmann, J.S. von Storch, J.H. Jungclaus, O. Gutjahr and H. Haak (2019): Surface flux drivers for the slowdown of the Atlantic meridional overturning circulation in a high‐resolution global coupled climate model. Journal of Advances in Modeling Earth Systems, 11, 1349-1363

Thomas, M.A., A. Devasthale, T. Koenigk, K. Wyser, M.J. Roberts, C.D. Roberts and K. Lohmann (2019): A statistical and process-oriented evaluation of cloud radiative effects in high-resolution global models. Geoscientific Model Development, 12, 1679-1702

Bador, M., J. Boe, L. Terray, L.V. Alexander, A. Baker, A. Bellucci, R.J. Haarsma, T. Koenigk, M.P. Moine, K. Lohmann, D.A. Putrasahan, C.D. Roberts, M.J. Roberts, E. Scoccimarro, R. Schiemann, J. Seddon, R. Senan, S. Valcke and B. Vanniere (2020): Impact of higher spatial atmospheric resolution on precipitation extremes over land in global climate models. Journal of Geophysical Research, 125, e2019JD032184

Boe, J., L. Terray, M.P. Moine, S. Valcke, A. Bellucci, S. Drijfhout, R.J. Haarsma, K. Lohmann, D.A. Putrasahan, C.D. Roberts, M.J. Roberts, E. Scoccimarro, J. Seddon, R. Senan and K. Wyser (2020): Past long-term summer warming over western Europe in new generation climate models: role of large-scale atmospheric circulation. Environmental Research Letters, 15, 084038

Roberts, M.J., L.C. Jackson, C.D. Roberts, V. Meccia, D. Docquier, T. Koenigk, P. Ortega, E. Moreno‐Chamarro, A. Bellucci, A. Coward, S. Drijfhout, E. Exarchou, O. Gutjahr, H. Hewitt, D. Iovino, K. Lohmann, D.A. Putrasahan, R. Schiemann, J. Seddon, L. Terray, X. Xu, Q. Zhang, P. Chang, S.G. Yeager, F.S. Castruccio, S. Zhang and L. Wu (2020): Sensitivity of the Atlantic meridional overturning circulation to model resolution in CMIP6 HighResMIP simulations and implications for future changes. Journal of Advances in Modeling Earth Systems, 12, e2019MS002014

Schiemann, R., P. Athanasiadis, D. Barriopedro, F. Doblas-Reyes, K. Lohmann, M.J. Roberts, D.V. Sein, C.D. Roberts, L. Terray and P.L. Vidale (2020): Northern Hemisphere blocking simulation in current climate models: evaluating progress from the Climate Model Intercomparison Project Phase~5 to 6 and sensitivity to resolution. Weather and Climate Dynamics, 1, 277-292

Gutjahr, O., N. Brueggemann, H. Haak, J.H. Jungclaus, D.A. Putrasahan, K. Lohmann and J.S. von Storch (2021): Comparison of ocean vertical mixing schemes in the Max Planck Institute Earth System Model (MPI-ESM1.2). Geoscientific Model Development, 14, 2317–2349

Putrasahan, D.A., O. Gutjahr, H. Haak, J.H. Jungclaus, K. Lohmann, M.J. Roberts and J.S. von Storch (2021): Effect of resolving ocean eddies on the transient response of global mean surface temperature to abrupt 4xCO2 forcing. Geophysical Research Letters, 48, e2020GL092049

Ruprich-Robert, Y., E. Moreno-Chamarro, X. Levine, A. Bellucci, C. Cassou, F. Castruccio, P. Davini, R. Eade, G. Gastineau, L. Hermanson, D.L.R. Hodson, K. Lohmann, J. Lopez-Parages, P.A. Monerie, D. Nicolì, S. Qasmi, C.D. Roberts, E. Sanchez-Gomez, G. Danabasoglu, N. Dunstone, M. Martin-Rey, R. Msadek, J. Robson, D. Smith and E. Tourigny (2021): Impacts of Atlantic multidecadal variability on the tropical Pacific: a multi-model study. NPJ Climate and Atmospheric Science, 4, 33

Curriculum vitae


Erasmus Program: School of Ocean Sciences, University of North Wales, Bangor, UK

1993 - 1999:
Study of physical oceanography, University of Kiel, Germany
Thesis (in German):  Tidal correction of ship-based current measurements

PhD at the Max Planck Institute for Meteorology, Hamburg, Germany
Thesis: Tropical Pacific/Atlantic climate variability and the subtropical-tropical cells


Work experience

September 2005 - October 2008:

PostDoc at the Nansen Environmental and Remote Sensing Center / Bjerknes Center for Climate Research, Bergen, Norway

EU-FP6 Project DYNAMITE (Understanding the dynamics of the coupled climate system)


since November 2008:

Scientist at the Max Planck Institute for Meteorology, Hamburg, Germany

EU-FP7 Project THOR (Thermohaline overturning circulation - at risk?), 2009-2012

EU-FP7 Project NACLIM (North Atlantic climate: Predictability of the climate in the North Atlantic/European sector related to North Atlantic/Arctic Ocean sea surface temperature and sea ice variability and change), 2013-2015

EU-H2020 Project PRIMAVERA (Process-based climate simulation: Advances in high-resolution modelling and European climate risk assessment), 2016-2019

EU-H2020 Project BlueAction (Arctic impact on weather and climate), 2017-2020

JPI-Oceans/JPI-Climate Project ROADMAP (The role of ocean dynamics and ocean-atmosphere interactions in driving climate variations and future projections of impact-relevant extreme events), 2020-2023