caa a22 4500 477058477 CHVBK 20180405111353.0 cr unu---uuuuu 170330e19961201xx s 000 0 eng 10.1007/BF01872153 doi (NATIONALLICENCE)springer-10.1007/BF01872153 Gordon A. Flinders Institute for Atmospheric and Marine Science, The Flinders University of South Australia, Bedford Park, SA, Australia aut Forced oscillations with damping proportional to velocity on a beta plane: the Southern Oscillation connection [Elektronische Daten] [A. Gordon] An analogy is made between mechanical and electrical oscillating systems and an oscillating atmospheric system. The problem is to study the behaviour of an oscillator driven by zonal forcing of the annual cycle with damping on an earth beta plane. When the Coriolis parameter is constant the system oscillates in a simple linear manner with the forcing frequency. When the Coriolis parameter is allowed to vary as a function of its latitudinal position, the equations for horizontal motion become non-linear and their numerical solutions exhibit non-linear and sometimes chaotic properties. If the oscillator is initially forced with a west to east (positive) pressure gradient the motion is convergent and stable in character. If it is initially forced with an east to west (negative) pressure gradient the motion is divergent and can be sensitive dependent on the exact starting latitude. Regular periodicities develop for the former case but in the latter case peaks and troughs of apparent cycles are aperiodic, chaotic or blow up. A connection is drawn between the behaviour of such an oscillating dynamical system and the ENSO phenomenon. A paradigm for the latter's observed behaviour is suggested. Baltzer Science Publishers, 1996 Environmental Modeling & Assessment Kluwer Academic Publishers 1/4(1996-12-01), 243-261 1420-2026 1:4<243 1996 1 10666 https://doi.org/10.1007/BF01872153 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01872153 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Gordon A. Flinders Institute for Atmospheric and Marine Science, The Flinders University of South Australia, Bedford Park, SA, Australia aut NATIONALLICENCE 773 0- Environmental Modeling & Assessment Kluwer Academic Publishers 1/4(1996-12-01), 243-261 1420-2026 1:4<243 1996 1 10666 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer