Dr. Jörg Franke

Lecturer / PostDoc


+41 31 684 85 45
Postal Address
University of Bern
Institute of Geography
Hallerstrasse 12
CH-3012 Bern
  • Data assimilation of early instrumental measurements and proxy records into an ensemble of climate model simulations to create a paleo-reanalysis
  • Assessing climatic extremes and return periods in non-stationary records
  • Climate modeling
  • Natural climate archives / Proxies
  • Climate variability (last millennium)
  • Spatial climate reconstructions

2013 – present: Lecturer for quantitative methods in Geography, Institute of Geography, University of Bern, Switzerland

2011 – present: Researcher, Climate Research group, Institute of Geography, University of Bern, Switzerland

2012 – 2014: Manager of climate data services, Oeschger Centre for Climate Change Research, University of Bern, Switzerland

2008 – 2011: Postdoc, Paleoclimatology Group, Dendro Sciences Unit, Swiss Federal Research Institute WSL, Birmensdorf, Switzerland

2004 – 2008: PhD in Geosciences at the University of Bremen Thesis title: Modeling the spatial and temporal variability of radiocarbon reservoir ages in the late Quaternary  

2003 – 2004: Project leader, Geonova GmbH, hydrogeological engineering company, Springe, Germany 

1997 – 2003: Diploma in Physical Geography at the University of Hanover. Thesis title: Correlation between the geological underground and terrestrial radioactivity

J. Franke, M.N. Evans, A. Schurer, A., G. C. Hegerl (2022): Climate change detection and attribution using observed and simulated tree-ring width, Climate of the Past, 18, 2583–2597, doi: 10.5194/cp-18-2583-2022.

K. Naegeli, J. Franke, C. Neuhaus, N. Rietze, M. Stengel, X. Wu, S. Wunderle (2022): Revealing four decades of snow cover dynamics in the Hindu Kush Himalaya, Scientific Reports, 12, 13443, doi: 10.1038/s41598-022-17575-4.

M. Fessehaye, J. Franke, S. Brönnimann (2022): Evaluation of satellite-based (CHIRPS and GPM) and reanalysis (ERA5-Land) precipitation estimates over Eritrea, Meteorologische Zeitschrift, 31, 401–413, doi: 10.1127/metz/2022/1111

L. Reichen, A.-M. Burgdorf, S. Brönnimann, J. Franke, R. Hand, V.Valler, E. Samakinwa, Y. Brugnara, T. Rutishauser (2022): A Decade of Cold Eurasian Winters Reconstructed for the Early 19th Century, Nature Communications (NCOMMS-21-30892B).

S. Brönnimann, P. Stucki, J. Franke, V. Valler, Y. Brugnara, R. Hand, L. C. Slivinski, G. P. Compo, P. D., Sardeshmukh, M. Lang, B. Schaefli (2022): Influence of Warming and Atmospheric Circulation Changes on Multidecadal European Flood Variability. Clim. Past, 18, p. 919-933, doi:10.5194/cp-2021-160     

V. Valler, J. Franke, Y Brugnara and S. Brönnimann (2021): EKF400 version 2: An updated global atmospheric paleo-reanalysis covering the last 400 years, Geoscience Data Journal, doi:  10.1002/gdj3.121.

M. Fessehaye, Y. Brugnara, J. Franke, S. Brönnimann (2021): Eritrean Central-Highland precipitation and associations with sea-surface temperature and atmospheric circulation, International Journal of Climatology, doi: 10.1002/joc.7138.

J. Franke, V. Valler, S. Brönnimann, R. Neukom, and F. Jaume Santero (2020): The importance of input data quality and quantity in climate field reconstructions – results from the assimilation of various tree-ring collections, Clim. Past, 16, 1061–1074, doi: 10.5194/cp-16-1061-2020

V. Valler, Y. Brugnara, J. Franke, and S. Brönnimann (2020): Assimilating monthly precipitation data in a paleoclimate data assimilation framework, Climate of the Past Discussions, https://doi.org/10.5194/cp-2019-137.

J. Hepp, I. K. Schäfer, V. Lanny, J. Franke, M. Bliedtner, K. Rozanski, B. Glaser, M. Zech, T. I. Eglinton, and R. Zech (2020): Evaluation of bacterial glycerol dialkyl glycerol tetraether and 2H-18O biomarker proxies along a Central European topsoil transect. Biogeosciences, 17, 741–756, doi: 10.5194/bg-17-741-2020.

T. Labbé, C. Pfister, S. Brönnimann, D. Rousseau, J. Franke, and B. Bois (2019): The longest homogeneous series of Grape Harvest Dates, Beaune 1354-2018, and its significance for the understanding of past and present climate. Climate of the Past, 15, 1485–1501, doi: 10.5194/cp-15-1485-2019.

A.-M. Burgdorf, S. Brönnimann, and J. Franke (2019): Two types of North American droughts related to different atmospheric circulation patterns. Climate of the Past, 15, 2053–2065, doi: 10.5194/cp-15-2053-2019.

S. Brönnimann, J. Franke, S. Nussbaumer, H. Zumbühl, D. Steiner, M. Trachsel, G. Hegerl, A. Schurer, M. Worni, A. Malik, J. Flückiger, and C. Raible (2019): Last phase of the Little Ice Age forced by volcanic eruptions. Nature Geoscience, vol. 60, no. 8, p. 42.

S. Brönnimann, L. Frigerio, M. Schwander, M. Rohrer, P. Stucki, and J. Franke (2019): Causes for increased flood frequency in central Europe in the 19th century. Climate of the Past, 15, 1395–1409, doi:  10.5194/cp-15-1395-2019.

V. Valler, J. Franke, and S. Brönnimann (2019): Impact of different estimations of the background-error covariance matrix on climate reconstructions based on data assimilation. Climate of the Past, 15, 1427-1441, doi: 10.5194/cp-15-1427-2019.

R. Neukom, L. Barboza, M. Erb, F. Shi, J. Emile-Geay, M. Evans, J. Franke, D. Kaufman, L. Lücke, K. Rehfeld, A. Schurer, F. Zhu, S. Brönnimann, G. Hakim, B. Henley, F. Ljungqvist, N. McKay, V. Valler, and L. von Gunten (2019): Consistent multi-decadal variability in global temperature reconstructions and simulations over the Common Era. Nature Geoscience, 536, no. 8, p. 411.

J. Franke, S. Brönnimann, J. Bhend and Y. Brugnara (2017): A monthly global paleo-reanalysis of the atmosphere from 1600 to 2005 for studying past climatic variations. Nature Scientific Data, doi: 10.1038/sdata.2017.76.

S. Samartin, O. Heiri, F. Joos, H. Renssen, J. Franke, S. Brönnimann, W. Tinner (2017): Warm Mediterranean mid-Holocene summers inferred from fossil midge assemblages. Nature Geosciences, doi: 10.1038/NGEO2891.

Schäfer, I. K., V. Lanny, J. Franke, T. I. Eglinton, M. Zech, B. Vysloužilová, and R. Zech (2016): Leaf waxes in litter and topsoils along a European transect. SOIL, 2, 551-564. doi:10.5194/soil-2-551-2016, 2016.

P.D. Henne, C. Elkin, J. Franke , D. Colombaroli, C. Calò, T. La Mantia, S. Pasta, M. Conedera, O. Dermody, and W. Tinner (2015): Reviving extinct Mediterranean forests increases ecosystem potential in a warmer future. Frontiers in Ecology and the Environment, 13, 356–362, doi:10.1890/150027.

J. Franke,  D. Frank, C. Raible, J. Esper and S. Brönnimann (2013): Spectral biases in tree-ring climate proxies. Nature Climate Change 3, 360-364 doi:10.1038/nclimate1816.

Wegmann, M., S. Brönnimann, J. Bhend, J. Franke, D. Folini, M. Wild, and J. Luterbacher (2014) Volcanic influence on European summer precipitation through monsoons: Possible cause for “Years Without a Summer”. J. Climate, 27, 3683-3691, doi:10.1175/JCLI-D-13-00524.1.

S. Brönnimann, O. Martius, J. Franke, A. Stickler and R. Auchmann (2013): Historical weather extremes in the “Twentieth Century Reanalysis”. In: Weather extremes during the past 140 years, S. Brönnimann, O. Martius (Editors), Geographica Bernensia, G89, p. 7-17, doi:10.4480/GB2013.G89.01.

B. Neff, C. Kummli, A. Stickler, J. Franke and S. Brönnimann (2013): An analysis of the Galveston Hurricane using the 20CR data set. In: Weather extremes during the past 140 years, S. Brönnimann, O. Martius (Editors), Geographica Bernensia, G89, p. 27-34, doi:10.4480/GB2013.G89.03.

T. Schneider, H, Weber, J. Franke and S. Brönnimann (2013): The Storm Surge Event of the Netherlands in 1953. In: Weather extremes during the past 140 years, S. Brönnimann, O. Martius (Editors), Geographica Bernensia, G89, p. 35-43, doi:10.4480/GB2013.G89.04.

P. Stucki, O. Martius, S. Brönnimann and J. Franke (2013): The extreme flood event of Lago Maggiore in September 1993. In: Weather extremes during the past 140 years, S. Brönnimann, O. Martius (Editors), Geographica Bernensia, G89, p. 53-58, doi:10.4480/GB2013.G89.06.

A. Elmore, F. Lehner, J. Franke and D. Anderson (2013): Data sharing in the future of climate science. PAGES news, volume 21, number 2.

S. Brönnimann, J .Franke, P. Breitenmoser, G. Hakim, H. Goosse, M. Widmann, M. Crucifix, G. Gebbie, J. Annan and G. van der Schrier (2013): Transient state estimation in paleoclimatology using data assimilation. PAGES news, volume 21, number 2.

S. Brönnimann, J. Bhend, J. Franke, A.M. Fischer, R. Bleisch, G. Bodeker, B. Hassler, E. Rozanov, and M. Schraner (2013): A global historical ozone data set and signatures of El Niño and the 11-yr solar cycle. Atmospheric Chemistry and Physics Discussions, 13, 7767-7809, doi:10.5194/acpd-13-7767-2013.

R. Auchmann, F. Arfeuille, M. Wegmann, J. Franke, M. Barriendos, M. Prohom, A. Sanchez-Lorenzo, J. Bhend, M. Wild, D. Folini, P. Štěpánek, and S. Brönnimann (2013) Impact of volcanic stratospheric aerosols on diurnal temperature range (DTR) in Europe over the past 200 years: Observations versus model simulations, J. Geophys. Res. Atmos., 118, 9064–9077, doi:10.1002/jgrd.50759.

J. Bhend, J. Franke,D. Folini, M. Wild, and S. Brönnimann (2012): An ensemble-based approach to climate reconstructions. Climate of the Past 8, 963–976, doi:10.5194/cp-8-963-2012.

J. Franke, J.F. Gonzalez Rouco , D. Frank and N.E. Graham (2011): 200 years of European temperature variability: insights from and tests of the proxy surrogate reconstruction analog method. Climate Dynamics, 37, 133-150, doi:10.1007/s00382-010-0802-6.

Baker, R. Wilson, I.J. Fairchild, J. Franke, C. Spotl D. Mattey, V. Trouet and L. Fuller (2010): High resolution ∂18O and ∂13C records of the last Millennium climate from an annually laminated Scottish stalagmite. Global Planetary Change, doi:10.1016/j.gloplacha.2010.12.007.

U. Büntgen,J. Franke, D. Frank, R. Wilson, J.F. González-Rouco and J. Esper (2010): Assessing the spatial signature of European climate reconstructions. Climate Research 41: 125-130, doi:10.3354/cr00848.

J. Luterbacher, S.J. König, J. Franke, G. van der Schrier, P.M. Della-Marta, M. Küttel, J. Jacobeit, F.J. Gonzalez-Rouco, E. Zorita, E. Xoplaki, R. Brázdil, D. Camuffo, P. Dobrovolny, C. Pfister, A. Moberg, R. Allan, M. Barriendos, L. Leijonhufvud, R. Wilson, D. Wheeler, D. Limanówka, O. Nordli, R. Glaser, A. van Engelen, T. Rutishauser, H. Wanner, C.S. Zerefos (2010): Circulation dynamics and influence on European and Mediterranean January-April climate over the past half millennium: Results and insights from instrumental data, documentary proxy evidence and coupled climate models. Climatic Change, 101, 201-234, doi:10.1007/s10584-009-9782-0.

J. Franke (2008): Modeling the Spatial and Temporal Variability of Marine Radiocarbon Reservoir Ages in the Late Quaternary. Dissertation, Department of Geosciences, University of Bremen.

J. Franke, A. Paul, M. Schulz and J. F. Adkins (2008): Assessing the ability of the 14C projection-age method to constrain the circulation of the past in a 3-D ocean model. Geochemistry, Geophysics, Geosystems, Vol. 9, No. 1, doi:10.1029/2008GC001943.

J. Franke, A. Paul and M. Schulz (2008). Modeling variations of marine reservoir ages during the last 45 000 years. Climate of the Past, Vol.4, pp. 125-136, doi:10.5194/cp-4-125-2008.