caa a22 4500 46905249X CHVBK 20180323132834.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF01026018 doi (NATIONALLICENCE)springer-10.1007/BF01026018 A three-dimensional atmospheric trajectory model: Application to a case study of alpine lee cyclogenesis [Elektronische Daten] [C. Rössler, T. Paccagnella, St. Tibaldi] Summary: In this paper the problem of computing large-scale trajectories of atmospheric parcels is examined in the framework of a numerical limited-area model used for weather prediction. The parcel of air is considered to be a completely passive tracer, having no interaction with the environment, even when going through an area of deep atmospheric convection. The usual method of computing the trajectory after the integration, using model-produced wind fields every six hours, is compared with the method of computing the trajectory in an almost continuous fashion, during the integration of the model itself, providing in this way an estimate of the time-truncation errors associated to the first, more usual, method. This second method is found to be quite superior and can, in selected instances, lead to largely different results, as documented. Examples of beams of trajectories going through a strongly diffluent flow-field, as well as through an area of strong convection are shown and found to be very realistic, within the limitations imposed by model resolution. In addition, the sensitivity of trajectories to the definition of the vertical coordinate is explored and found to be large. Springer-Verlag, 1992 Rössler C. Department of Physics, Atmospheric Dynamic Group (ADGB), University of Bologna, Bologna, Italy aut Paccagnella T. Regional Meteorological Service of Emilia Romagna (SMR/ERSA), Via San Felice 25, I-40122, Bologna, Italy aut Tibaldi St Department of Physics, Atmospheric Dynamic Group (ADGB), University of Bologna, Bologna, Italy aut Meteorology and Atmospheric Physics Springer-Verlag 50/4(1992-12-01), 211-229 0177-7971 50:4<211 1992 50 703 https://doi.org/10.1007/BF01026018 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01026018 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rössler C. Department of Physics, Atmospheric Dynamic Group (ADGB), University of Bologna, Bologna, Italy aut NATIONALLICENCE 700 1- Paccagnella T. Regional Meteorological Service of Emilia Romagna (SMR/ERSA), Via San Felice 25, I-40122, Bologna, Italy aut NATIONALLICENCE 700 1- Tibaldi St Department of Physics, Atmospheric Dynamic Group (ADGB), University of Bologna, Bologna, Italy aut NATIONALLICENCE 773 0- Meteorology and Atmospheric Physics Springer-Verlag 50/4(1992-12-01), 211-229 0177-7971 50:4<211 1992 50 703 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer