caa a22 4500 469084634 CHVBK 20180323133001.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF02657508 doi (NATIONALLICENCE)springer-10.1007/BF02657508 McHall Yong Dept. of Meteorology, University of Edinburgh, EH9 3JZ, UK aut Nonlinear planetary wave instability and blocking [Elektronische Daten] [Yong McHall] The instability of geostrophic wave circulations related to the nonlinear processes involved in the zonal mean heat balance equations is studied. It is found that the planetary waves may be destabilized by thermal forcing in specific baroclinic layers, called the breaking layers. The critical conditions of the instability will be given. In the troposphere, these conditions may be provided in blocking regions and the development of planetary perturbations is characterized distinctly by the unset, maintenance and decay of observed blocks. The whole blocking episode cannot be described as either the barotropic or baroclinic process only. The limitations on the study of wave-wave interaction using spectral models or spectrum analyses will be discussed also. Advances in Atmospheric Sciences, 1992 Advances in Atmospheric Sciences Science Press 9/2(1992-06-01), 173-190 0256-1530 9:2<173 1992 9 376 https://doi.org/10.1007/BF02657508 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02657508 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- McHall Yong Dept. of Meteorology, University of Edinburgh, EH9 3JZ, UK aut NATIONALLICENCE 773 0- Advances in Atmospheric Sciences Science Press 9/2(1992-06-01), 173-190 0256-1530 9:2<173 1992 9 376 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer