Praezisions-Feuchte-Radiosondierungen zum Studium des Einflusses der relativen Feuchte auf die optischen und mikrophysikalischen Eigenschaften des atmosphaerischen Aerosols. T. 1: Anlagen 1-3. T. 2: Anlagen 4-10 Schlussbericht

1. Precise relative humidity (RH) measurements are difficult and therefore seldom in the free atmosphere up to now. The radiosondes of the national weather services do not fulfill the requirements of the accuracy. Fundamental problems of RH measurement exist for temperatures below -30 C (upper troposphere and stratosphere). 2. The working objective was the supply of precise RH vertical profils applying to the Lindenberg Aerosol Characterization Experiment (LACE) in the period July 13 to August 12 1998. 3. The software and the calibration of the Lindenberg humidity reference research radiosonde RS90 FN has been improved applying the method of 'standardized frequencies'. 4. Precise humidity profiles (which an absolute precision of about (#+-#1%) were provided). These profiles have been used both in the framework of the experiment LACE and for the corrections of the operational radiosonde RS80. 5. The main applications of the 'standardized frequencies' method are the validation and correction of other humidity measuring techniques [LIDAR, microwave radiometry, infrared spectroscopy, in situ humidity sensors]. (orig.)Published in two volumesSIGLEAvailable from TIB Hannover: F02B1048+a: F02B1049+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung, Berlin (Germany); Gesellschaft fuer Strahlen- und Umweltforschung mbH Muenchen, Neuherberg (Germany)DEGerman