Dr. Gerd Helle

helle

Helmholtz Centre Potsdam

GFZ German Research Centre for Geosciences

assoziierter Wissenschaftler

Adresse Telegrafenberg, Haus D
Raum 220
14473 Potsdam
Telefon +49 331 288-1377
Fax +49 331 288-1302
E-Mail gerhard.helle@gfz-potsdam.de

Career:

  • since 2009 Senior Scientist, Head of Dendrolaboratory, Section 5.2 Climate Dynamics and Landscape Evolution, German Centre for GeoSciences GFZ
  • 2005-2008 Group Leader “Tree-ring stable isotopes” at the Institute for Chemistry and Dynamics of the Geosphere, ICG-4 Sedimentary Systems, Helmholtz Centre Jülich
  • 2000-2005 Research Group Leader and Co-Ordinator of the young researchers network project  “ TRICE – Tree-Rings, Isotopes, Climate and Environment”, at the Institute for Chemistry and Dynamics of the Geosphere, ICG-4 Sedimentary Systems, Helmholtz Centre Jülich, funded by the German Federal Ministry for Education and Research (BMBF) within the German Climate Research Programme DEKLIM
  • 1998-2000 PostDoc at the Institute for Chemistry and Dynamics of the Geosphere, ICG-4 Sedimentary Systems (Prof. Dr. G.H. Schleser), Helmholtz Centre Jülich, Germany (special leave from MünsterUniversity)
  • 1997-1998 Assistant lecturer at the Chair of Palaeontology (Prof. F. Strauch), University of Münster, Germany    
  • 1997 Young scientist at the Chair of Palaeontology, Institute for Geology & Palaeontology, University of Tübingen, Germany

Education:

  • 1997 Dissertation (Dr. rer. nat.) in Geosciences, Department 14: GeoSciences, University of Münster, Germany Title: "Hochauflösende intra-annuelle Kohlenstoff-Isotopenuntersuchungen an Baumjahresringen"
  • 1994 Diploma in Geology & Palaeontology, Department 14: GeoSciences, University of Münster,  Germany

Research Boards and Committees:

since 2012 Member of the board of Association for Tree-ring Research (ATR) (treasurer)

2001 Founding Member of the Association for Tree-ring Research (ATR)

2013/2014 Introduction to Dendrochronology. Lecture and practical training course.
FU Berlin, Geological Sciences, Palaeontology

Research Interests:  

  • Stable isotope techniques with focus on invention and optimization of methodologies for high-resolution and high-throughput isotope analysis of tree-rings
  • Climate signal and stable isotope transfer from atmosphere, soil and leaves into tree-rings
  • Natural climate variability of the late Glacial/early Holocene period as well as the Common Era, i.e. the last 2000 years
  • Stable isotope variability in tropical timber (Tropical dendroclimatology)
  • Dendrochronology of Central Asia

Patents:

  • "Verfahren zur thermischen Umsetzung von Probenmaterial in Messgas". DE102010001677.2; WO2011/095639A1

Projects:
GFZ German Research Centre for GeoSciences: 

  • since 2011 Global Change Observatory Central Asia (GCO-CA) – Palaeoclimate, Environment, and Climate Change; Partners: CAIAG ( Central Institute of Applied Geosciences, Bishkek, Kyrgizstan; KNAU ( Kyrgyz National Agrarian University, Bishkek, Kyrgyzstan, Dr. Almazbek Orozumbekov), UB-RAS (Russian Academy of Sciences, Ural Branch, Ekaterinburg, Prof. Dr. V. Mazepa)

Eva-Mayr-Stihl Foundation:

  • 2013 - 2014 "Assessment of contemporary vs. Lateglacial/EarlyHolocene climate variability based on isotopes from the NZ kauri tree­‐ring archive – IsoWoodNZ "; Partners: Alan Hogg, Radiocarbon Laboratory, Waikato University, Hamilton, NZ &  Jonathan Palmer, Climate Change Research Centre, University of New South Wales in Sydney, AU and Gondwana Tree-Ring Laboratory, Canterbury, NZ    

Federal Ministry for Education and research (BMBF):

  • 2011 - 2014 Verbundprojekt: CADY, Central Asian Climate DYnamics; Project 3: 20th century Westerlies - Monsoon variability in view of the past 1500 years - high resolution studies on multi-parameter records from tree rings.(FK 03G0813H)
  • 2012 - 2014 Quid agis woody C4? Past and Present Response of Woody C3 and C4 Plants to Climate Change - A pilot study on Sophora chrysophylla (C3) and Euphorbia olowaluana (C4) trees in Hawai`i, USA; International Bureau; Partner: Patrick Hart, UH Hilo, Hawaii, USA
  • 2012 - 2014 Assessment of Present-Day vs. Lateglacial/Early Holocene climate variability and atmospheric CO2 changes utilizing the tree-ring archive of Kauri; Internationales Büro; Partners: Alan Hogg, Radiocarbon Laboratory, Waikato University, Hamilton, NZ & Jonathan Palmer, University of New South Wales in Sydney, AU and Gondwana Tree-Ring Laboratory, Canterbury, NZ
  • 2009 - 2013 Verbundprojekt: Bioenergie2012: ISOWOOD-Breeding: Nutzbarmachung SNP-basierter Selektionsstrategien für die Züchtung ertragsoptimierter Pappelsorten in landwirtschaftlichen Kurzumtriebsplantagen; Teilprojekt 4: Dendroisotope & Wassernutzungseffizienz (FK0315427B) Partner: Prof. Dr. D. Krabel, Dr. Mathias Meyer, TU Dresden, AG Molekulare Gehölzphysiologie, Dr. D. Landgraf, P&P Forstdienstleistungen, Eitelborn.
  • 2001 - 2006 German climate research programme DEKLIM, Young researchers programme, Network project: TRICE - Tree-Rings, Isotopes, Climate and Environment

German Science Foundation (DFG):

  • 2013 - 2015 Twentieth Century changes of tree ring isotopes in Southeastern Brazilian forests: How do climate conditions influence growth and water use efficiency (WUE) and thus enforce tree migration. Joint DFG/FAPESP Research Grant Proposal (HE3089/5-1); Partners: Dieter Anhuf, Universität Passau & Dr. Gregório Ceccantini, University of São Paulo USP – Plant Anatomy, São Paulo, Brazil - (Principal investigator in Brazil)
  • 2010 - 2013 HIMPAC (HE3089/4-1), Himalaya: Modern and Past Climates  
  • 2007 - 2011 INDOPAL (HE3089/2-1), The role of the Indian Ocean in tropical climate variability – a paleo-perspective
  • 2005 - 2008 PIRIN (HE3089/1-1), Rekonstruktion der jüngeren Klima-und Landschaftsentwicklung in sensible südosteuropäischen Grenzräumen am Beispiel des Piringebirges, Bulgarien  

EU 6th Framework:

  • 2006 - 2011 MILLENNIUM (FP-017008-2), "European climate of the last millennium"

EU 5th Framework:

  • 2003 - 2007 ISONET (EVK2-CT-2002-00149), "400 years of Annual Reconstructions of European Climate Variability using a High Resolution Isotopic Network"; Co-ordinator WP 3 "Intra-annual isotope variability and process studies"

Selected publications:

Highlights (most cited):

  • Brienen, R. J. W.; Helle, G.; Pons, T. L.; Guyot, J.-L.; Gloor, M. (2012): Oxygen isotopes in tree rings are a good proxy for Amazon precipitation and El Niño-Southern Oscillation variability. PNAS, 109, 42, 16957-16962.
  • Treydte, K.S., Schleser, G.H., Helle, G., Winiger, M., Frank, D., Haug, G. & Esper, J. (2006) Twentieth century as the wettest period in northern Pakistan over the past millennium. Nature, 440: 1179‐1182
  • Helle, G. & Schleser, G.H. (2004). Beyond CO 2-fixation by Rubisco – an interpretation of 13C/ 12C variations in tree rings from novel intra‐seasonal studies on broad‐leaf trees. Plant, Cell & Environment, 27,367‐380
  • Schleser,G.H., Helle, G., Lücke, A. & H. Vos (1999) Isotope signals as climate proxies: the role of transfer functions in the study of terrestrial archives. Quaternary Science Reviews, 18/7: 927-943

Books/book chapters

  • Helle, G., Schleser,G.H. (2004). Interpreting climate proxies from tree-rings. In: Fischer, H., Floeser, G., Kumke,T., Lohmann, G., Miller, H., Negendank, J.F.W., von Storch, H. (Eds.): Towards a synthesis of Holocene proxy data and climate models. Springer Verlag Berlin
  • T. Kumke, A. Hense, C. Schölzel, A.A. Andreev, C. Brüchmann, C. Gebhardt, G. Helle, U. Kienel, N. Kühl, T. Litt, F. Neumann, G. Schleser (2004) Transfer functions for paleoclimate reconstructions-applications. In: Fischer, H., Floeser, G., Kumke,T., Lohmann, G., Miller, H., Negendank, J.F.W., von Storch, H. (Eds.): Towards a synthesis of Holocene proxy data and climate models. Springer Verlag Berlin   

Other publications:

  • Helle, G. & I. Heinrich (2012) Baumjahresringe als chemisch-physikalischer Datenträger für Umwelt- und Klimainformationen der Vergangenheit. System Erde, 2(1), 58-61. doi:10.2312/GFZ.syserde.02.01.11
  • Bens, O., Schwank, M., Blume, T., Brauer, A., Güntner, A., Heinrich, I., Helle, G., Itzerott, S., Kaiser, K., Sachs, T. & R.F. Hüttl (2012) TERENO – Eine Monitoring- und Forschungsplattform zur Erfassung langfristiger Auswirkungen des Globalen Wandels auf regionaler Ebene System Erde, 2(1), 68-73, doi:10.2312/GFZ.syserde.02.01.13
  • Voronin, V.I., Tartakovsky, V.A., Volkov, Yu.V., Schleser, G.H., Helle, G., Nesvetailo, V.D. (2008). Tree-ring isotope chronologies of the Baikal region and their connection with ice isotope chronologies of Greenland. Atmos. Oceanic Opt., 21, 1: 50- 53
  • Bertold, J., Helle, G., Kitagawa, C. Peters, J. & F. Strauch (2006) Nordsee oder Mittelmeer? Römische Austern und  andere Speiseabfälle einer gehobenen Küche aus den Thermengrabungen in der Colonia Ulpia Traiana. Xantener Berichte: Grabung - Forschung - Präsentation, Bd. 14, Landschaftsverband Rheinland, M. Müller (Hrsg.); Verlag Philipp von Zabern, Mainz
  • Helle, G., Treydte, K.S. & Verheyden, A. (2004) Tropical Swietenia macrophylla wood reveals a systematic recurring carbon isotope pattern. TRACE Tree Rings in Archaeology, Climatology and Ecology, Vol. 2
    Proceedings of the DENDROSYMPOSIUM 2003, May 1st – 3rd 2003, Utrecht, The Netherlands, ISBN 3-89336-349-1: 107-109
  • Poszwa, A., Wickman, T., Dambrine, E., Ferry, B., Dupouey, J.L., Helle, G., Schleser, G.H., Breda, N. (2003)
    A retrospective isotopic study of spruce decline in the Vosges Mountains (France). Water, Air, and Soil Pollution, 3: 201-222
  • Helle, G., Schleser, G.H., Bräuning, A. (2002) Climate history of the Tibetan Plateau for the last 1500 years as inferred from stable carbon isotopes in tree-rings. IAEA, Study of Environmental Change using isotope techniques. Proceedings of an Int. Conf., Vienna, 23-27 April 2001: 301-311
  • Attendorn, H.G., Helle, G., Strauch, F. & G.E Thüry (2003) Provenienzuntersuchungen an römischen Fundaustern aus der Zone nordwärts der Alpen. Röm. Österreich 23/24: 7-42
  • Helle, G., Schleser, G. H. (1998): Die Eichenbohlen des neolithischen Brunnens von Erkelenz-Kückhoven als Klimaarchive. - In: Koschik, H. (Ed.), Brunnen der Jungsteinzeit: internationales Symposium in Erkelenz, 27. bis 29. Oktober 1997, (Materialien zur Bodendenkmalpflege im Rheinland ; 11), Köln, 271-277.