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Publications
Helmholtz Centre Potsdam
GFZ German Research Centre for Geosciences
(Co) Author: Barthelmes, F.
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Abe, M.; Kroner, C.; Förste, C.; Petrovic, S.; Barthelmes, F.; Weise, A.; Güntner, A.; Creutzfeldt, B.; Jahr, T.; Jentzsch, G.; Wilmes, H.; Wziontek, H. (2012): A comparison of GRACE-derived temporal gravity variations with observations of six European superconducting gravimeters. Geophysical Journal International, 191, 2, 545-556.
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Steffen, H.; Petrovic, S.; Müller, M.; Schmidt, R.; Wünsch, J.; Barthelmes, F.; Kusche, J. (2009): Significance of secular trends of mass variations determined from GRACE solutions. Journal of Geodynamics, 48, 3-5, 157-165.
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Förste, C.; Schmidt, R.; Stubenvoll, R.; Flechtner, F.; Meyer, U.; König, R.; Neumayer, H.; Biancale, R.; Lemoine, J.-M.; Bruinsma, S.; Loyer, S.; Barthelmes, F.; Esselborn, S. (2008): The GeoForschungsZentrum Potsdam / Groupe de Recherche de Géodésie Spatiale satellite-only and combined gravity field models: EIGEN-GL04S1 and EIGEN-GL04C. Journal of Geodesy, 82, 6, 331-346.
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Neumeyer, J.; Barthelmes, F.; Kroner, C.; Petrovic, S.; Schmidt, R.; Virtanen, H.; Wilmes, H. (2008): Analysis of gravity field variations derived from Superconducting Gravimeter recordings, the GRACE satellite and hydrological models at selected European sites. Earth Planets and Space, 60, 5, 505-518.
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Neumeyer, J.; Barthelmes, F.; Dierks, O.; Flechtner, F.; Harnisch, M.; Harnisch, G.; Hinderer, J.; Imanishi, Y.; Kroner, C.; Meurers, B.; Petrovic, S.; Reigber, C.; Schmidt, R.; Schwintzer, P.; Sun, H.-P.; Virtanen, H. (2006): Combination of temporal gravity variations resulting from superconducting gravimeter (SG) recordings, GRACE satellite observations and global hydrology models. Journal of Geodesy, 79, 10-11, 573-585.
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Reigber, C.; Balmino, G.; Schwintzer, P.; Biancale, R.; Bode, A.; Lemoine, J.-M.; König, R.; Loyer, S.; Neumayer, H.; Marty, J.-C.; Barthelmes, F.; Perosanz, F.; Zhu, S. Y. (2003): Global gravity field recovery using solely GPS tracking and accelerometer data from CHAMP. Space science reviews, 108, 1, 55-66.
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Reigber, C.; Schwintzer, P.; Neumayer, K.-H.; Barthelmes, F.; König, R.; Förste, C.; Balmino, G.; Biancale, R.; Lemoine, J.-M.; Loyer, S.; Bruinsma, S.; Perosanz, F.; Fayard, T. (2003): The CHAMP-only Earth Gravity Field Model EIGEN-2. Advances in Space Research, 31, 8, 1883-1888.
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Reigber, C.; Balmino, G.; Schwintzer, P.; Biancale, R.; Bode, A.; Lemoine, J. M.; König, R.; Loyer, S.; Neumayer, H.; Marty, J. C.; Barthelmes, F.; Perosanz, F.; Zhu, S. Y. (2002): A high-quality global gravity field model from CHAMP GPS tracking data and accelerometry (EIGEN-1S). Geophysical Research Letters, 29, 14.
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Greiner-Mai, H.; Barthelmes, F. (2001): Relative wobble of the Earth's inner core derived from polar motion and associated gravity variations. Geophysical Journal International, 144, 1, 27-36.
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Prokoph, A.; Barthelmes, F. (1996): Detection of nonstationarities in geological time series: wavelet transform of chaotic and cyclic sequences. Computers and Geosciences, 22, 10, 1097-1108.
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Neumeyer, J.; Barthelmes, F.; Wolf, D. (1999): Estimates of environmental effects in superconducting gravimeter data. Marées Terrestres, Bulletin d'Informations, 131, 10153-10159.
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Reigber, C.; Barthelmes, F.; Greiner-Mai, H.; Gruber, T.; Jochmann, H.; Wünsch, J. (1999): Temporal gravity field variations from oceanic, atmospheric and inner core mass redistributions and their sensitivity to new gravity missions CHAMP and GRACE. Bollettino di Geofisica Teorica ed Applicata, 40, 3-4, 329-340.
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Wolf, D.; Barthelmes, F.; Sigmundsson, F. (1997): Predictions of deformation and gravity variation caused by recent change of Vatnajökull ice cap, Iceland. Journées luxembourgeoises de géodynamique. Comptes rendus, 82, 36-42.
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Petrovic, S.; Braun, R.; Barthelmes, F.; Wünsch, J.; Kusche, J.; Hengst, R. (2010): Surface mass variability from GRACE and hydrological models: Characteristic periods and the reconstruction of significant signals. - In: Flechtner, F. M.; Gruber, T.; Güntner, A.; Mandea, M.; Rothacher, M.; Schöne, T.; Wickert, J. (Eds.), System Earth via Geodetic-Geophysical Space Techniques, Springer, 377-386.
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Förste, C.; Stubenvoll, R.; König, R.; Raimondo, J.-C.; Flechtner, F.; Barthelmes, F.; Kusche, J.; Dahle, C.; Neumayer, H.; Biancale, R.; Lemoine, J.-M.; Bruinsma, S. (2009): Evaluation of EGM2008 by comparison with other recent global gravity field models. Newton's Bulletin, 4, 26-37.
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Petrovic, S.; Schmidt, R.; Wünsch, J.; Barthelmes, F.; Hengst, R.; Kusche, J. (2007): Periodic Components of Water Storage Changes from GRACE and Global Hydrological Models. Observations of the System Earth from Space : status seminar, 22 - 23 November 2007, Bavarian Academy of Sciences and Humanities, Munich; Programme & Abstracts, Koordinierungsbüro Geotechnologien, 177-182.
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Schmidt, R.; Flechtner, F.; Meyer, U.; Reigber, C.; Barthelmes, F.; Förste, C.; Stubenvoll, R.; König, R.; Neumayer, K.-H.; Zhu, S. Y. (2006): Static and time-variable gravity from GRACE mission data. - In: Flury, J.; Rummel, R.; Reigber, C.; Rothacher, M.; Boedecker, G.; Schreiber, U. (Eds.), Observation of the Earth System from Space, Springer, 115-130.
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Reigber, C.; Jochmann, H.; Wünsch, J.; Petrovic, S.; Schwintzer, P.; Barthelmes, F.; Neumayer, K.-H.; König, R.; Förste, C.; Balmino, G.; Biancale, R.; Lemoine, J.-M.; Loyer, S.; Perosanz, F. (2005): Earth gravity field and seasonal variability from CHAMP. - In: Reigber, C.; Lühr, H.; Schwintzer, P.; Wickert, J. (Eds.), Earth Observation with CHAMP: Results from Three Years in Orbit, Springer-Verlag, 25-30.
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Neumeyer, J.; Schwintzer, P.; Barthelmes, F.; Dierks, O.; Imanishi, Y.; Kroner, C.; Meurers, B.; Sun, H.-P.; Virtanen, H. (2004): Comparison of Superconducting Gravimeter and CHAMP Satellite derived Temporal Gravity Variations. - In: Reigber, C.; Lühr, H.; Schwintzer, P.; Wickert, J. (Eds.), Earth observation with CHAMP : results from thre years in orbit, Springer, 31-36.
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Reigber, C.; Balmino, G.; Schwintzer, P.; Biancale, R.; Bode, A.; Lemoine, J. M.; König, R.; Loyer, S.; Neumayer, H.; Marty, J. C.; Barthelmes, F.; Perosanz, F.; Zhu, S. Y. (2003): New Global Gravity Field Models from Selected CHAMP Data Sets. - In: Reigber, C.; Lühr, H.; Schwintzer, P. (Eds.), First CHAMP Mission Results for Gravity, Magnetic and Atmospheric Studies, Springer-Verlag, 120-127.
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Schwintzer, P.; Reigber, C.; König, R.; Neumayer, K.-H.; Barthelmes, F.; Stubenvoll, R.; Förste, C.; Bode, A.; Zhu, S. Y. (2003): Global Gravity Field Recovery with CHAMP: Data Pre-processing and Modeling Results. - In: Rudloff, A.; Stroink, L. (Eds.), Observation of the System Earth from Space : status seminar, Bavarian State Mapping Agency (BVLA), Munich, 12-12 June 2003 ; programme & abstracts, Koordinierungsbuero GEOTECHNOLOGIEN, 161-164.
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Marchenko, A. N.; Barthelmes, F.; Meyer, U.; Schwintzer, P. (2002): Efficient Regional Geoid Computations from Airborne and Surface Gravimetry Data - A Case Study -. - In: Ádám, J.; Schwarz, K.-P. (Eds.), Vistas for geodesy in the new millennium : IAG 2001 scientific assembly, Budapest, Hungary, September 2-7, 2001, Springer Verlag, 223-228.
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Greiner-Mai, H.; Jochmann, H.; Barthelmes, F. (1999): Modellierung des Einflusses einer hypothetischen Innenkernbewegung auf die Polbewegung, das Erdmagnetfeld und das Gravitationsfeld. - In: Schneider, M. (Eds.), 3. DFG-Rundgespräch zum Thema Bezugssysteme, Verlag des Bundesamtes für Kartographie und Geodäsie, 33-43.
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Wolf, D.; Barthelmes, F.; Sigmundsson, F. (1997): Predictions of deformation and gravity change caused by recent melting of the Vatnajökull ice cap, Iceland. - In: Segawa, J.; Fujimoto, H.; Okubo, S. (Eds.), Gravity, Geoid and Marine Geodesy, Springer-Verlag, 311-319.
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Ballani, L.; Stromeyer, D.; Barthelmes, F. (1993): Decomposition principles for linear source problems. - In: Anger, G.; Gorenflo, R.; Jochmann, H.; Moritz, H.; Webers, W. (Eds.), Inverse Problems: Principles and Applications in Geophysics, Technology and Medicine, Akademie Verlag, 45-59.
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Förste, C.; Shako, R.; Flechtner, F.; Dahle, C.; Abrykosov, O.; Neumayer, K.-H.; Barthelmes, F.; König, R.; Bruinsma, S.-L.; Marty, J.-C.; Lemoine, J.-M.; Balmino, G.; Biancale, R. (2012): A new release for EIGEN-6 - the latest combined global gravity field model including LAGEOS, GRACE and GOCE data from the collaboration of GFZ Potsdam and GRGS Toulouse. General Assembly European Geosciences Union (Vienna, Austria 2012).
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Förste, C.; Bruinsma, S.; Shako, R.; Marty, J.-C.; Flechtner, F.; Abrikosov, O.; Dahle, C.; Lemoine, J. M.; Neumayer, H.; Biancale, R.; Barthelmes, F.; Balmino, G.; König, R. (2011): EIGEN-6 - A new combined global gravity field model including GOCE data from the collaboration of GFZ Potsdam and GRGS Toulouse. 4th International GOCE User Workshop (Munich 2011).
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Förste, C.; Shako, R.; Flechtner, F.; Dahle, C.; Abrykosov, O.; Neumayer, K.-H.; Barthelmes, F.; König, R.; Bruinsma, S. L.; Marty, J.-C.; Lemoine, J.-M.; Balmino, G.; Biancale, R. (2011): EIGEN-6 - The new combined global gravity field model including GOCE from the collaboration of GFZ Potsdam and GRGS Toulouse. AGU 2011 Fall-Meeting (San Francisco 2011).
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Gruber, C.; Barthelmes, F.; Novak, P. (2011): Derivation of topographic potential from global DEM models. General Assembly European Geosciences Union (Vienna, Austria 2011).
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Scheinert, M.; Schwabe, J.; Eberlein, L.; Dietrich, R.; Barthelmes, F.; Förste, C.; Petrovic, S.; Pflug, H.; Lesur, V.; Gebler, A.; Geiger, A.; Wickert, J.; Beyerle, G.; Semmling, M.; Gerber, T.; Ribó, S.; Rius, A.; Cardellach, E.; Heyde, I.; Meyer, U.; Blindow, N.; Jenett, M.; Markgraf, M.; Rivas, R.; Grillenberger, A. (2011): The Application of the New German 'High Altitude and Long Range Research Aircraft' (HALO) for Airborne Geodesy and Geophysics. 11th International Symposium on Antarctic Earth Sciences (ISAES XI) (Edinburgh 2011).
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Scheinert, M.; Schwabe, J.; Eberlein, L.; Dietrich, R.; Barthelmes, F.; Förste, C.; Petrovic, S.; Pflug, H.; Lesur, V.; Gebler, A.; Geiger, A.; Wickert, J.; Beyerle, G.; Semmling, M.; Gerber, T.; Ribó, S.; Rius, A.; Cardellach, E.; Heyde, I.; Meyer, U.; Blindow, N.; Markgraf, M.; Rivas, R.; Grillenberger, A.; Jenett, M. (2011): The Application of the New German 'High Altitude and Long Range Research Aircraft' (HALO) for Airborne Geodesy and Geophysics. 25th IUGG General Assembly (Melbourne 2011).
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Barthelmes, F.; Köhler, W. (2010): ICGEM - a Web Based Service for Using Global Earth Gravity Field Models. IAG Symposium on Terrestrial Gravimetry: Static and Mobile Measurements (TG-SMM2010) (Saint Petersburg, Russia 2010).
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Barthelmes, F.; Köhler, W. (2010): ICGEM - the International Centre for Global Earth Models. 2nd International Symposium of the International Gravity Field Service (Fairbanks, Alaska 2010).
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Petrovic, S.; Barthelmes, F. (2010): Detecting arbitraty periods and trends in surface mass variability from GRACE observations. 2nd International Symposium of the International Gravity Field Service (Fairbanks, Alaska 2010).
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Scheinert, M.; Schwabe, J.; Dietrich, R.; Barthelmes, F.; Förste, C.; Petrovic, S.; Pflug, H.; Lesur, V.; Gebler, A.; Wickert, J.; Stosius, R.; Beyerle, G.; Semmling, M.; Heyde, I.; Meyer, U.; Blindow, N.; Markgraf, M.; Rivas, R.; Jenett, M.; Geiger, A. (2010): Geoscientific Research with the New German High Altitude and Long Range Research Aircraft (HALO). 2nd International Symposium of the International Gravity Field Service - IGFS (Fairbanks, Alaska 2010).
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Förste, C.; Flechtner, F.; Stubenvoll, R.; Neumayer, K.-H.; Raimondo, J.-C.; König, R.; Barthelmes, F.; Dahle, C.; Kusche, J.; Biancale, R.; Lemoine, J.-M.; Bruinsma, S. (2009): Evaluation of recent global gravity field models. General Assembly European Geosciences Union (Vienna, Austria 2009).
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Scheinert, M.; Schabe, J.; Dietrich, R.; Barthelmes, F.; Förste, C.; Petrovic, S.; Pflug, H.; Lesur, V.; Gebler, A.; Geiger, A.; Wickert, J.; Stosius, R.; Beyerle, G.; Semmling, M.; Heyde, I.; Meyer, U.; Blindow, N.; Markgraf, M.; Rivas, R.; Jenett, M. (2009): Geoscientific Research with the New German 'High Altitude and Long Range Research Aircraft' (HALO). International Workshop Aerogravimetry: Technology and Applications (Dresden 2009).
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Barthelmes, F.; Köhler, W.; Kusche, J. (2008): ICGEM The International Centre for Global Earth Models. Observing and Forecasting the Ocean GODAE Final Symposium (Nice, France 2008).
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Förste, C.; Flechtner, F.; Schmidt, R.; Stubenvoll, R.; Rothacher, M.; Kusche, J.; Neumayer, K.-H.; Biancale, R.; Lemoine, J.-M.; Barthelmes, F.; Bruinsma, J.; König, R.; Meyer, U. (2008): EIGEN-GL05C - A new global combined high-resolution GRACE-based gravity field model of the GFZ-GRGS cooperation. General Assembly European Geosciences Union (Vienna, Austria 2008).
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Förste, C.; Flechtner, F.; Stubenvoll, R.; Rothacher, M.; Kusche, J.; Neumayer, K.-H.; Biancale, R.; Lemoine, J.-M.; Barthelmes, F.; Bruinsma, S.; König, R.; Dahle, C. (2008): EIGEN-5C - the new GeoForschungsZentrum Potsdam / Groupe de Recherche de Geodesie Spatiale combined gravity field model. OSTST Meeting (Nice, France 2008).
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Förste, C.; Flechtner, F.; Stubenvoll, R.; Rothacher, M.; Kusche, J.; Neumayer, K.-H.; König, R.; Barthelmes, F.; Raimondo, J. C.; Biancale, R.; Bruinsma, S.; Lemoine, J. M.; Dahle, C. (2008): EIGEN-5C – the new GeoForschungsZentrum Potsdam / Group de Recherche de Geodesie Spatiale combined gravity field model. AGU 2008 Fall Meeting (San Francisco 2008).
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Barthelmes, F.; Köhler, W.; Kusche, J. (2007): ICGEM - The International Centre for Global Earth Models. General Assembly European Geosciences Union (EGU) (Vienna, Austria 2007).
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Förste, C.; Flechtner, F.; Schmidt, R.; König, R.; Meyer, U.; Stubenvoll, R.; Rothacher, M.; Barthelmes, F.; Neumayer, H.; Biancale, R.; Bruinsma, S.; Lemoine, J.-M.; Loyer, S. (2007): Global mean gravity field models from combination of satellite mission and altimetry/gravimetry surface data. 3rd International GOCE User Workshop (Frascati, Italy, 6-8 November 2006), 163-167.
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Förste, C.; Flechtner, F.; Schmidt, R.; Stubenvoll, R.; Rothacher, M.; Kusche, J.; Neumayer, H.; Biancale, R.; Lemoine, J.-M.; Loyer, S.; Barthelmes, F.; Bruinsma, S.; König, R.; Meyer, U. (2007): EIGEN-05C - A new global mean Gravity Field Model from Combination of Satellite Mission and Altimetry/Gravimetry Surface data. General Assembly European Geosciences Union (EGU) (Vienna, Austria 2007).
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Petrovic, S.; Schmidt, R.; Wünsch, J.; Barthelmes, F.; Güntner, A.; Rothacher, M. (2007): Towards a characterization of temporal gravity field variations in GRACE observations and global hydrology models. Proceedings of the 1st International Symposium of the International Gravity Field Service 'Gravity field of the earth', 1st International Symposium of the International Gravity Field Service 'Gravity field of the earth' (Istanbul 2006), 199-204.
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Barthelmes, F.; Köhler, W. (2006): The International Centre for Global Earth Models (ICGEM). 3rd General Assembly European Geosciences Union (Vienna, Austria 2006).
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Förste, C.; Flechtner, F.; Schmidt, R.; Meyer, U.; Stubenvoll, R.; Barthelmes, F.; König, R.; Neumayer, K.-H.; Rothacher, M.; Reigber, C.; Raimondo, J. C.; Biancale, R. (2005): A new high resolution global gravity field model derived from combination of GRACE and CHAMP Mission and Altimetry/Gravimetry surface gravity data. 2nd General Assembly European Geosciences Union (Vienna, Austria 2005).
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Greiner-Mai, H.; Guo, J-Y; Barthelmes, F. (2004): Free and forced inner-core wobble: clues for their detection in EOP and gravity data.. 1st General Assembly European Geosciences Union (Nice, France 2004).
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Greiner-Mai, H.; Guo, J-Y; Barthelmes, F. (2004): Inner-core motions; probing their detectability in the earth's rotation and gravity data. 9th Symposium on the Study of the Earth's Deep Interior (SEDI) (Garmisch-Partenkirchen, Germany 2004), 51.
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Schwintzer, P.; Reigber, C.; Stubenvoll, R.; Schmict, R.; Flechtner, F.; Förste, C.; Barthelmes, F.; Biancale, R.; Balmino, G.; Lemoine, J.-M. (2004): A high resolution global gravity field model combining CHAMP/GRACE satellite Mission and altimetry/ gravimetry surface gravity data. 1st General Assembly European Geosciences Union (Nice, France 2004).
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Reigber, C.; Schwintzer, P.; Stubenvoll, R.; König, R.; Neumayer, K.-H.; Förste, C.; Barthelmes, F.; Balmino, G.; Biancale, R.; Lemoine, J.-M.; Loyer, S.; Bruinsma, S.; Perosanz, F.; Fayard, T. (2003): Implications of CHAMP gravity field recovery improvement for high-resolution global gravity field models. EGS-AGU-EUG Joint Assembly (Nice 2003).
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Reigber, C.; Balmino, G.; Schwintzer, P.; Biancale, R.; Barthelmes, F.; Bode, A.; Gruber, T.; König, R.; Lemoine, J. M.; Loyer, S.; Perosanz, F. (2001): A New Global Gravity Model Using CHAMP GPS-SST and Accelerometer Data. 26th General Assembly of the European Geophysical Society (EGS) ( Nice 2001), 1605.
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Schwintzer, P.; Reigber, C.; Barthelmes, F.; Bode, A.; Gruber, T.; König, R.; Biancale, R.; Balmino, G.; Lemoine, J. M.; Loyer, S.; Perosanz, F. (2000): Gravity Field Recovery from CHAMP: First Results. F307.
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Greiner-Mai, H.; Jochmann, H.; Barthelmes, F. (1998): About the influence of a possible relative rotation of the earth's inner core on the polar motion, the geomagnetic field and the gravity field. 23th General Assembly of the European Geophysical Society (EGS) (Nice, France 1998).
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Neumeyer, J.; Barthelmes, F.; Wolf, D. (1998): Atmospheric Pressure Correction for Gravity Data Using Different Methods. 13th International Symposium on Earth Tides (Brüssel 1997), 431-438.
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Wolf, D.; Barthelmes, F. (1997): Glacially induced tilt and gravity changes in Iceland: constraints on lithosphere thickness and asthenosphere viscosity. AGU 1997 Fall Meeting (San Francisco, USA 1997).
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Ballani, L.; Barthelmes, F. (1996): The wavelet transform as a tool for time series analysis. XXI General Assembly European Geophysical Society (The Hague, Netherlands 1996).
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Neumeyer, J.; Barthelmes, F. (1996): The Wavelet Transform in Gravity Data Analysis. XXI European Geophysical Society General Assembly (Den Haag 1996).
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Barthelmes, F. (2009): Definition of Functionals of the Geopotential and Their Calculation from Spherical Harmonic Models: Theory and formulas used by the calculation service of the International Centre for Global Earth Models (ICGEM), http://icgem.gfz-potsdam.de. Scientific Technical Report ; 09/02, Deutsches GeoForschungsZentrum GFZ, 32.
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Reigber, C.; Schwintzer, P.; Stubenvoll, R.; Schmidt, R.; Flechtner, F.; Meyer, U.; König, R.; Neumayer, H.; Förste, C.; Barthelmes, F.; Zhu, S. Y.; Balmino, G.; Biancale, R.; Lemoine, J.-M.; Meixner, H.; Raimondo, J. C. (2006): A high resolution global gravity field model combining CHAMP and GRACE satellite mission and surface data: EIGEN-CG01C.. Scientific Technical Report ; STR 06/07, GeoForschungsZentrum, 12.
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Dobslaw, H.; Schwintzer, P.; Barthelmes, F.; Flechtner, F.; Reigber, C.; Schmidt, R.; Schöne, T.; Wiel, M. (2004): Geostrophic Ocean Surface Velocities from TOPEX Altimetry, and CHAMP and GRACE Satellite Gravity Models. Scientific Technical Report ; 04/07, GeoForschungsZentrum Potsdam, 22.
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Greiner-Mai, H.; Jochmann, H.; Barthelmes, F. (1998): About the influence of a possible relative rotation of the earth's inner core on the polar motion, the geomagnetic field and the gravity field. Scientific Technical Report; STR 98/06, GeoForschungsZentrum Potsdam, 15.
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Barthelmes, F. (1986): Untersuchungen zur Approximation des äußeren Gravitationsfeldes der Erde durch Punktmassen mit optimierten Positionen. Veröffentlichungen des Zentralinstituts für Physik der Erde ; 92, Als Ms. gedr., 122.
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Helm, A.; Barthelmes, F.; Beyerle, G.; Bohm, M.; Kaban, M. K.; Magnussen, S.; Reigber, C.; Schwintzer, P.; Schmidt, R.; Schmidt, T.; Schöne, T.; Wickert, J. (2005): Wie hoch sind die Wellen? - Meeres- und Wellenhöhen aus reflektierten GPS-Signalen bestimmen. Kopernikus-Gymnasium.
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Helm, A.; Barthelmes, F.; Beyerle, G.; Bohm, M.; Kaban, M. K.; Magnussen, S.; Reigber, C.; Schwintzer, P.; Schmidt, R.; Schmidt, T.; Schöne, T.; Wickert, J. (2005): Wie hoch sind die Wellen? Meer rausholen aus GPS.
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