Boreal summer intraseasonal oscillations in the MJO skeleton model with observation-based forcing

H. Reed Ogrosky, Samuel N. Stechmann, Andrew J. Majda

Research output: Contribution to journalArticle

Abstract

The Madden-Julian oscillation (MJO) skeleton model is a low-order model for intraseasonal oscillations that, in an extended form, includes off-equatorial and antisymmetric components. Previous studies of this extended model have used an idealized background state and forcing terms. In the current study, observation-based estimates of these forcing terms and background state are used. Linear solutions to the extended model with this observation-based forcing consist of both equatorially-symmetric convective events and events with a meridional tilt reminiscent of composites of the boreal summer intraseasonal oscillation (BSISO) in observational studies. Solutions to a nonlinear stochastic form of the model exhibit realistic precipitation mean and variance and intraseasonal variability throughout much of the tropics. These solutions contain several types of events, including meridionally-tilted convective activity that moves both northward and eastward. Solutions to both forms of the model also indicate that this BSISO-like convective activity is coupled to activity over the eastern Pacific. A discussion of these features and their agreement with previous observational studies of the BSISO is given.

Original languageEnglish (US)
Pages (from-to)38-56
Number of pages19
JournalDynamics of Atmospheres and Oceans
Volume78
DOIs
StatePublished - Jun 1 2017

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Madden-Julian oscillation
skeleton
oscillation
summer
Tropics
tilt
Composite materials

Keywords

  • Boreal summer intraseasonal oscillation
  • MJO skeleton model

ASJC Scopus subject areas

  • Oceanography
  • Geology
  • Computers in Earth Sciences
  • Atmospheric Science

Cite this

Boreal summer intraseasonal oscillations in the MJO skeleton model with observation-based forcing. / Ogrosky, H. Reed; Stechmann, Samuel N.; Majda, Andrew J.

In: Dynamics of Atmospheres and Oceans, Vol. 78, 01.06.2017, p. 38-56.

Research output: Contribution to journalArticle

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