Peer-Reviewed Publications: 
Behrendt, A., T. Nakamura, and T. Tsuda, 2004: Combined temperature lidar for measurements in the troposphere, stratosphere, and mesosphere. Appl. Optics 43(14), 2930-2939.
DOI:10.1364/AO.43.002930
Eckhardt, K. and K. Bigalke, 2004: Comparison of two model systems for the calculation of the solar irradiance on shaded, arbitrarily orientated surfaces. Meteorol. Z. 13(5), 369-372.
DOI:10.1127/0941-2948/2004/0013-0369
Gérard, É., D. G. H. Tan, L. Garand, V. Wulfmeyer, G. Ehret, and P. Di Girolamo, 2004: Major advances foreseen in humidity profiling from water vapour lidar experiment in space (WALES). B. Am. Meteorol. Soc. 85(2), 237-251.
DOI:10.1175/BAMS-85-2-237
Lammel, G., F. Schneider, E. Brueggemann, T. Gnauk, A. Roehrl, and P. Wieser, 2004: Aerosols emitted from a livestock farm in Southern Germany. Water Air Soil Poll. 154, 313-330.
DOI:10.1023/B:WATE.0000022962.65942.4b
Wurster, R., 2004: Can laser microprobe mass analysis do any work in artwork conservation? In: Lasers in the Conservation of Artworks, K. Dickmann, C. Fotakis, J. F. Asmus (Eds.), Springer Proceedings in Physics, 347-352.
DOI:10.1007/3-540-27176-7_43
Contributions to Conferences:
Bauer, H., H.-S. Bauer, V. Wulfmeyer, M. Wirth, G. Mayer, G. Ehret, D. Summa, and P. Di Girolamo, 2004: End-to-end simulation of the performance of WALES: Forward module. In: G. Pappalardo, A. Amadeo (Eds.), Reviewed and Revised Papers of the 22nd International Laser Radar Conference (ILRC 2004), July 12-16, 2004, Matera, Italy (ESA SP-561, June 2004), p. 1011-1014.
Bauer, H.-S., V. Wulfmeyer, A. Behrendt, F. Vandenberghe, and E. V. Browell, 2004: Assimilation von DIAL - Wasserdampfdaten in mesoskalige Wettervorhersagemodelle: Eine Fallstudie mit MM5 waehrend IHOP_2002. Deutsch-oesterreichisch-Schweizerische Meteorologentagung DACH 2004, September 7-10, Karlsruhe, Germany.
Bauer, H.-S., 2004: Data assimilation in numeroical weather prediction models: An introduction and example with MM5 and 4DVAR during IHOP_2002. 1st COPs Workshop, 13-14 September 2004, University of Hohenheim, Stuttgart, Germany.
Behrendt, A., T. Nakamura, T. Tsuda, and V. Wulfmeyer, 2004: Rotational Raman temperature lidar: New experimental results and performance expected for future ground-based and airborne systems. In: G. Pappalardo, A. Amadeo (Eds.), Reviewed and Revised Papers of the 22nd International Laser Radar Conference (ILRC 2004), July 12-16, 2004, Matera, Italy (ESA SP-561, June 2004), 33-36.
Behrendt, A., V. Wulfmeyer, U. Corsmeier, L. Gantner, and C. Barthlott, 2004: COPS "Supersites". 1st COPs Workshop, 13-14 September 2004, University of Hohenheim, Stuttgart, Germany.
Behrendt, A., and V. Wulfmeyer, 2004: Lidar Synergy: Combined rotational Raman temperature lidar and water vapor DIAL for humidity, temperature, and particle measurements. 3rd Workshop “Lidar Research Water Vapor and Wind”, University of Hohenheim, Stuttgart, Germany.
Behrendt, A., A. Petrova, T. Schaberl, M. Shiler, G. Wagner, and V. Wulfmeyer, 2004: Lidar systems for 4-dimensional observations of atmospheric key parameters in development at University of Hohenheim. Verhandlungen der Deutschen Physikalischen Gesellschaft zur 68. Physikertagung (Proceeding of the 68th Meeting of the German Physical Society), Fachvortrag UP 3.7, 176.
Breuer, L., K. Eckhardt und H.-G. Frede, 2004: Auswirkungen der Parameterunsicherheit verschiedener Landbedeckungen auf die Modellierung hydrologischer Komponenten sowie P-, N- und Sedimentfrachten. In: Hennrich, K., Rode, M., Bronstert, A. (Hrsg.): 6. Workshop zur großskaligen Modellierung in der Hydrologie. Kassel University Press, 93-104.
Di Girolamo, P., D. Summa, H. Bauer, V. Wulfmeyer, A. Behrendt, G. Ehret, B. Mayer, M. Wirth, and C. Kiemle, 2004: Simulation of the performance of WALES based on an end-to-end model. In: G. Pappalardo, A. Amadeo (Eds.), Reviewed and Revised Papers of the 22nd International Laser Radar Conference (ILRC 2004), July 12-16, 2004, Matera, Italy (ESA SP-561, June 2004), 957-960.
Eckhardt, K., 2004: Abbildung heterogener Bodeninformation in verteilten hydrologischen Modellen. Forum fuer Hydrologie und Wasserbewirtschaftung, 5, 101-104.
Ostermeyer, M., P. Kappe, R. Menzel, and V. Wulfmeyer, 2004: Frequency-stabilized, diode pumped Nd:YAG laser with up to 0.5 J pulse energy and average power of 100 W. In: G. Pappalardo, A. Amadeo (Eds.), Reviewed and Revised Papers of the 22nd International Laser Radar Conference (ILRC 2004), July 12-16, 2004, Matera, Italy (ESA SP-561, June 2004), p. 57-60.
Petrova, A., G. Wagner, and V. Wulfmeyer, 2004: Eye-safe lidar transmitter at 1.45 µm based on a Cr4+:YAG laser. In: G. Pappalardo, A. Amadeo (Eds.), Reviewed and Revised Papers of the 22nd International Laser Radar Conference (ILRC 2004), July 12-16, 2004, Matera, Italy (ESA SP-561, June 2004), p. 199-202.
Sabatino, D., P. Di Girolamo, D. N. Whiteman, B. B. Demoz, E. V. Browell, S. Ismail, R. Ferrare, S. A. Kooi, A. Behrendt, and V. Wulfmeyer, 2004: Water vapour measurements during the International H2O Project: Intercomparisons between Scanning Raman Lidar and LASE. In: G. Pappalardo, A. Amadeo (Eds.), Reviewed and Revised Papers of the 22nd International Laser Radar Conference (ILRC 2004), July 12-16, 2004, Matera, Italy (ESA SP-561, June 2004), p. 435-438.
Summa, D., P. Di Girolamo, H. Bauer, and V. Wulfmeyer, 2004: End-to-end simulation of the performance of WALES: Retrieval module. In: G. Pappalardo, A. Amadeo (Eds.), Reviewed and Revised Papers of the 22nd International Laser Radar Conference (ILRC 2004), July 12-16, 2004, Matera, Italy (ESA SP-561, June 2004), p. 1015-1018.
Wagner, G., M. Shiler, and V. Wulfmeyer, 2004: Design and development of a high-power Ti:Sapphire laser transmitter. In: G. Pappalardo, A. Amadeo (Eds.), Reviewed and Revised Papers of the 22nd International Laser Radar Conference (ILRC 2004), July 12-16, 2004, Matera, Italy (ESA SP-561, June 2004), p. 203-206.
Wulfmeyer, V., G. Adrian, A. Hense, C. Kottmeier, and C. Simmer, 2004: The German Priority Program 1167 Quantitative Precipitation Forecast. 1st THORPEX International Science Symposium, Montreal, Canada, December 6-10.
Wulfmeyer, V., H.-S. Bauer, and A. Behrendt, 2004: Operatoren und Fehlerkovarianzmatrizen fuer Lidar-Systeme und deren Anwendungen zur Assimilation in mesoskalige Modelle. Deutsch-oesterreichisch-Schweizerische Meteorologentagung DACH 2004, September 7-10, Karlsruhe, Germany.
Wulfmeyer, V., H.-S. Bauer, A. Behrendt, F. Vandenberghe, and E. V. Browell, 2004: Assimilation of DIAL data in mesoscale models: An impact study during IHOP_2002. In: G. Pappalardo, A. Amadeo (Eds.), Reviewed and Revised Papers of the 22nd International Laser Radar Conference (ILRC 2004), July 12-16, 2004, Matera, Italy (ESA SP-561, June 2004), p. 639-642.
Wulfmeyer, V., 2004: Role and Goals of COPS within the Priority Program 1167 “QPF”. 1st COPs Workshop, 13-14 September 2004, University of Hohenheim, Stuttgart, Germany.
Wulfmeyer, V., G. Wagner, M. Shiler, A. Petrova, A. Behrendt, T. Schaberl, U. Wandinger, D. Althausen, A. Riede, M. Ostermeyer, A. Straesser, R. Menzel, M. Wirth, A. Fix, G. Ehret, S. Mayor, S. Spuler, and T. Weckwerth, 2004: Ground-based, scanning water vapor DIAL reference systems. 3rd Workshop “Lidar Research Water Vapor and Wind”, University of Hohenheim, Stuttgart, Germany.
Monographs and Reports:
Bauer, H.-S., P. Di Girolamo, C. Kiemle, T. Schaberl, and V. Wulfmeyer (Ed.), 2004: Measurement and intercomparison of active, passive, and in-situ-sensors during the international water vapour project for the verification of the specifications of the WALES experiment. First Technical Note of ESTEC Contract No. 16669/02/NL/FF, 115 pages, March 2004. 
Behrendt, A. (Ed.), C. Kiemle, P. Di Girolamo, H.-S. Bauer, T. Schaberl, and V. Wulfmeyer (Ed.), 2004: Measurement and intercomparison of active, passive, and in-situ-sensors during the international water vapour project for the verification of the specifications of the WALES experiment. Second Technical Note of ESTEC Contract No. 16669/02/NL/FF, 115 pages, March 2004. 
Behrendt, A. (Ed.), C. Kiemle, P. Di Girolamo, H.-S. Bauer, T. Schaberl, and V. Wulfmeyer, 2004: Measurement and intercomparison of active, passive, and in-situ-sensors during the international water vapour project for the verification of the specifications of the WALES experiment. Final Report of ESTEC Contract No. 16669/02/NL/FF, 56 pages, March 2004.
Behrendt, A. (Ed.), C. Kiemle, P. Di Girolamo, H.-S. Bauer, T. Schaberl, and V. Wulfmeyer, 2004: Measurement and intercomparison of active, passive, and in-situ-sensors during the International Water Vapour Project for the verification of the specifications of the WALES experiment. Executive Summary of ESTEC Contract No. 16669/02/NL/FF, 4 pages, March 2004. 
Behrendt, A. (Ed.), C. Kiemle, P. Di Girolamo, and V. Wulfmeyer (Ed.), 2004: Measurement and intercomparison of active, passive, and in-situ-sensors during the international water vapour project for the verification of the specifications of the WALES experiment. Third Technical Note of ESTEC Contract No. 16669/02/NL/FF, 36 pages, March 2004.
Di Girolamo, P. (Ed.), D. Summa, V. Wulfmeyer, H. Bauer, H.-S. Bauer, A. Behrendt, M. Wirth, and B. Mayer, 2004: Development of an end-to-end model to simulate the performances of a water vapour DIAL system in space. Executive Summary of ESTEC Contract No. 16993/03/NL/FF, 4 pages, June 2004.
Di Girolamo, P. (Ed.), D. Summa, V. Wulfmeyer, H. Bauer, H.-S. Bauer, A. Behrendt, M. Wirth, and B. Mayer, 2004: Development of an end-to-end model to simulate the performances of a water vapour DIAL system in space. Final Report of ESTEC Contract No. 16993/03/NL/FF, 124 pages, June 2004.
Haas, U., 2004: Measuring methods for greenhouse gases. Colloquium “Sustainable Agriculture and Land Use Strategies”. China Agricultural University, Beijing (China), October 7, 2004
Hense, A., G. Adrian, C. Kottmeier, C. Simmer, and V. Wulfmeyer, 2004: Das Schwerpunktprogramm SPP 1167 der Deutschen Forschungsgemeinschaft „Quantitative Niederschlagsvorhersage“. DMG-Mitteilungen, 02/2004.  
Wirth, M., A. Behrendt, C. Kiemle, and G. Ehret, 2004: Requirements definition for future DIAL instruments: Review of instrument concepts and measurement physics. Technical Note of ESTEC Contract No. RFQ/3-10880/03/NL/FF, 157 pages, June 2004.
Wulfmeyer, V. (Coauthor), 2004: European Space Agency, WALES - Water Vapour Lidar Experiment in Space. The Five Candidate Earth Explorer Core Missions, European Space Agency. Report for Mission Selection, ESA SP-1279(3), April 2004.
Selected Presentations:
Behrendt, A., 2004: COPS and lidar activities at UHOH. Research Center for a Sustainable Humanosphere, Kyoto, Japan.
Behrendt, A., 2004: Atmospheric temperature profiling with rotational Raman lidar. First International Raman Lidar Techniques Workshop, May 25-28, 2004, NASA Goddard Space Flight Center in Greenbelt, Maryland, USA.
Haas, U., 2004: Modeling approaches to gas flux estimations sino-german workshop on modeling issues. Sino-German Center for Research Promotion, Beijing (China), July 5-7, 2004.
Haas, U., 2004: Measurement of trace gases by means of laser spectroscopic techniques sino-german workshop on modeling issues. Sino-German Center for Research Promotion, Beijing (China), July 5-7, 2004.
Selected Public Talks:
Haas, U. und P. Menzel, 2004: Kinder-Uni UHOH: Warum brennt eine Kerze? 26.11.2004.