Sogachev A. and O. Panferov, 2006,
Modification of two-equation models to account for plant drag, Boundary Layer Meteorology, DO 10.1007/s10546-006-9073-5.

Panferov, O., A. Sogachev, H. Kreilein , G. Gravenhorst, 2006,
Influence of a topography on quality of flux measurements above a rainforest in Central Sulawesi, Indonesia, EGU General Assembly, Vienna, April 2006, Geophys. Res. Abstr., Vol.8

Panferov, O., A. Olchev, K. Radler, D. Fellert, G. Gravenhorst, 2006,
Radiation distribution on a clear-cut within a mature forest stand on a gentle slope. EGU General Assembly, Vienna, April 2006, Geophys. Res. Abstr., Vol.8

Olchev, A., A.Sogachev, K. Radler, O. Panferov, D. Fellert, G. Gravenhorst, 2006,
Turbulent regime of the atmospheric surface layer at a small clear-cutting forest area: results of a modelling study. EGU General Assembly, Vienna, April 2006, Geophys. Res. Abstr., Vol.8

Sogachev A, O. Panferov, G. Gravenhorst and T. Vesala, 2005,
Numerical analysis of flux footprints for different landscapes. Theor. Appl. Climatology, Vol. 80, NO. 2-4: 169-185

Panferov, O., Sogachev, A., Helle, G., Vesala, T. and G. Gravenhorst, 2005,
Modelling of tree stem temperature for deciduous species. European Conference on Ecological Modelling. Proceedings / The Fifth European Conference on Ecological Modelling - ECEM, 2005, Pushchino

Panferov, O., Sogachev, A., Helle, G., Vesala, T. and G. Gravenhorst, 2005,
Modelling of tree stem temperature for deciduous species. European Conference on Ecological Modelling. Proceedings / The Fifth European Conference on Ecological Modelling - ECEM, 2005, Pushchino

Panferov, O., Ibrom, A. and G. Gravenhorst, 2004,
Application of different models of individual tree crowns for 3-D description of radiation and photosynthesis in forest stands. “Modelling Forest Production”, BOKU, Vienna

Panferov O., A. Sogachev, T. Vesala , G. Gravenhorst, 2003,
Footprint estimation for the conditions of underlying surface covered by horizontally inhomogeneous vegetation, EGS-AGU-EUG Joint Assembly, Nice, April 2003, Geophys. Res. Abstr., Vol.5

Helle, G. & Panferov, O. (2004).
Tree rings, isotopes, climate and environment - TRICE. PAGES Newsletter 12/2: 22-23.
(pdf, 227kb)

Loader, N.J., Robertson, I., Lücke, A. & Helle, G. (2002).
Preparation of holocellulose from standard increment cores for stable carbon isotope analysis. Swansea Geographer 37:1-9.

Verheyden, A., Helle, G., Schleser, G.H., Dehairs, F. Beeckman, H. & Koedam, N. (2004).
Annual cyclicity in high-resolution stable carbon and oxygen isotope ratios in the wood of the mangrove tree Rhizophora mucronata. Plant, Cell & Environment, accepted

Sass-Klaassen, U., Poole, I., Wils, T., Helle, G., Schleser, G.H. & van Bergen, P.F. (2004).
Carbon and oxygen isotope dendrochronology in sub-fossil bog oak tree rings - a preliminary study. International Association of Wood Anatomists (IAWA) Journal, accepted

Helle, G. & Schleser, G.H. (2004).
Beyond CO₂-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
(pdf, 770KB)

Poole, I., Sass-Klaassen, U. Wils, T., Helle, G., Schleser, G.H. & van Bergen, P.F. (2004).
The use of stable-isotope dendrochronology for environmental interpretations from tree-ring patterns in sub-fossil bog oaks.
In: Jansma, E., Bräuning, A., Gärtner, H. & Schleser, G.H. (eds.) 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, pp. 94 - 99.
(pdf, 60KB)

Treydte, K., Welscher, C., Schleser, G.H., Helle, G., Esper, J., Winiger, M., Frank, D. & Büntgen, U. (2004).
The climatic signal in oxygen isotopes of junipers at the lower timberline in the Karakorum, Pakistan.
In: Jansma, E., Bräuning, A., Gärtner, H. & Schleser, G.H. (eds.) 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, pp. 100 - 106.
(pdf, 1.086KB)

Helle, G., Treydte, K.S. & Verheyden, A. (2004).
Tropical Swietenia macrophylla wood reveals a systematic recurring carbon isotope pattern.
In: Jansma, E., Bräuning, A., Gärtner, H. & Schleser, G.H. (eds.) 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, pp. 107 - 109.
(pdf, 88KB)

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.): The KIHZ project: Towards a synthesis of Holocene proxy data and climate models. Springer Verlag Berlin, pp. 129-148
(pdf, 1.517KB)

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.): The KIHZ project: Towards a synthesis of Holocene proxy data and climate models. Springer Verlag Berlin, pp. 245-262
(pfd, 1.286KB)

Helle, G. & Schleser, G.H. (2003) Seasonal variations of stable carbon isotopes from tree-rings of Quercus petraea.
In: Schleser, G., Winiger, M., Bräuning, A., Gärtner, H., Helle, G., Jansma, E., Neuwirth, B. & Treydte, K. (eds.) TRACE Tree Rings in Archaeology, Climatology and Ecology, Vol. 1. Proceedings of the DENDROSYMPOSIUM 2002, April 11th - 13th 2002, Bonn/Jülich, Germany, ISBN 3-89336-323-8, pp. 66 - 70.
(pdf, 160KB)

Helle, G., Bräuning, A. & Schleser, G.H. (2002).
Climate History of the Tibetan Plateau for the last 1500 years as inferred from stable carbon isotopes in tree rings. IAEA CN 80/80: 301 - 311
(pdf, 2.978KB)

Gravenhorst, G., Vygodskaya N., & Panferov, O., (2002).
Monitoring of energy and mass exchange between atmosphere and forest ecosystem, Transactions of Institute of Bioclimatology, Göttingen University, Reihe B. Germany.

Panferov, O., Sogachev, A., Gravenhorst, G., 2002, Correction of Source distribution function for the 3-D footprint modelling. EGS Gen. Assem. XVII, Nice, April 2002, Geophys. Res. Abstr., Vol. 4

Sogachev, A., Panferov, O., Gravenhorst, G., Lloyd, J. (2002): Application of 3-D numerical model of atmospheric boundary layer for the estimation of footprint. EGS Gen. Assem. XVII, Nice, April 2002, Geop.Res.Abs., Vol. 4

Thüry, G.E., Attendorn, G.H., Helle, G., Strauch, F. (2000).
Provenienzuntersuchungen an römischen Fundaustern aus der Zone nördlich der Alpen.
- Römisches Österreich, Bd. 21

Schleser, G.H., Helle, G., Lücke, A. & Vos, H. (1999).
Isotope signals as climate proxies: the role of transfer functions in the study of terrestrial archives. Quaternary Science Reviews 18: 927 - 943
(pdf, 536KB)

Lücke,A., Helle,G., Schleser,G.H., Figueiral,I., Mosbrugger, V. (1999).
Middle Miocene environmental history as reflected by carbon isotope signals in brown coal of the Lower Rhine Embayment.
- Palaeogeogr. Palaeoclim. Palaeoecol. 154:339-352
(pdf, 541KB)

Helle, G., Schleser, G.H. (1998).
Die Eichenbohlen des neolithischen Brunnens von Erkelenz-Kückhoven als Klimaarchive.
Materialien zur Bodendenkmalpflege im Rheinland, Bd. 11, Landschaftsverband Rheinland. Rheinisches Amt für Bodendenkmalpflege, Bonn

Helle, G., Schleser, G.H., Jansen, C. (1995).
Untersuchungen über die 13C-Variabilität innerhalb von Jahrringen verschiedener Bäume.
- Isotopes in Environmental and Health Studies, 392: 46-47

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