caa a22 4500 605470936 CHVBK 20210128100330.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s00382-014-2256-8 doi (NATIONALLICENCE)springer-10.1007/s00382-014-2256-8 Asymmetric intraseasonal events in the stochastic skeleton MJO model with seasonal cycle [Elektronische Daten] [Sulian Thual, Andrew Majda, Samuel Stechmann] The stochastic skeleton model is a simplified model for the Madden-Julian oscillation (MJO) and intraseasonal-planetary variability in general involving coupling of planetary-scale dry dynamics, moisture, and a stochastic parametrization for the unresolved details of synoptic-scale activity. The model captures the fundamental features of the MJO such as the intermittent growth and demise of MJO wave trains, the MJO propagation speed, peculiar dispersion relation, quadrupole vortex structure, etc. We analyze here the solutions of a stochastic skeleton model with an idealized seasonal cycle, namely a background warm pool state of heating/moistening displacing meridionally during the year. The present model considers both equatorial and off-equatorial components of the envelope of synoptic scale convective activity, which allows for a large diversity of meridionally symmetric and asymmetric intraseasonal events found in nature. These include examples of symmetric events with MJO quadrupole vortex structure, half-quadrupole events with off-equatorial convective heating structure, as well as tilted events with convective heating structure oriented north-westward and associated northward propagation that is reminiscent of the summer monsoon intraseasonal oscillation. The model also reproduces qualitatively the meridional migration of intraseasonal variability during the year, that approximatively follows the meridional migration of the background warm pool. Springer-Verlag Berlin Heidelberg, 2014 Tropical atmospheric dynamics nationallicence Skeleton model nationallicence MJO nationallicence Summer monsoon ISO nationallicence Thual Sulian Department of Mathematics, Center for Atmosphere Ocean Science, Courant Institute of Mathematical Sciences, New York University, 251 Mercer Street, 10012, New York, NY, USA aut Majda Andrew Department of Mathematics, Center for Atmosphere Ocean Science, Courant Institute of Mathematical Sciences, New York University, 251 Mercer Street, 10012, New York, NY, USA aut Stechmann Samuel Department of Mathematics, University of Wisconsin-Madison, 480 Lincoln Drive, 53706, Madison, WI, USA aut Climate Dynamics Springer Berlin Heidelberg 45/3-4(2015-08-01), 603-618 0930-7575 45:3-4<603 2015 45 382 https://doi.org/10.1007/s00382-014-2256-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00382-014-2256-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Thual Sulian Department of Mathematics, Center for Atmosphere Ocean Science, Courant Institute of Mathematical Sciences, New York University, 251 Mercer Street, 10012, New York, NY, USA aut NATIONALLICENCE 700 1- Majda Andrew Department of Mathematics, Center for Atmosphere Ocean Science, Courant Institute of Mathematical Sciences, New York University, 251 Mercer Street, 10012, New York, NY, USA aut NATIONALLICENCE 700 1- Stechmann Samuel Department of Mathematics, University of Wisconsin-Madison, 480 Lincoln Drive, 53706, Madison, WI, USA aut NATIONALLICENCE 773 0- Climate Dynamics Springer Berlin Heidelberg 45/3-4(2015-08-01), 603-618 0930-7575 45:3-4<603 2015 45 382