This study investigates: (i) how the local meridional (Hadley) and zonal (Walker) circulations change in each phase of Madden-Julian Oscillation (MJO); (ii) effect enhanced suppressed MJO-related convection on poleward extent Hadley and, thus, strengths positions subtropical jets. We examine these effects ERA-Interim reanalysis by decomposing vertical mass flux into components. show for first t...

Abstract The Madden‐Julian Oscillation (MJO), the dominant mode of tropical intraseasonal variability, is commonly identified using realtime multivariate MJO (RMM) index based on joint empirical orthogonal function (EOF) analysis near‐equatorial upper and lower level zonal winds outgoing longwave radiation. Here, in place conventional EOFs, we apply an operator‐theoretic formalism dynamic syste...

Abstract This study investigates the role of convection–circulation coupling on simulated eastward propagation Madden–Julian Oscillation (MJO) over Maritime Continent (MC). Experiments are conducted with European Centre Hamburg Model Version 5 (ECHAM5) coupled one-column ocean model—Snow-Ice-Thermocline (SIT) and two different cumulus schemes, Nordeng-Tiedtke (E5SIT-Nord) Tiedtke (E5SIT-Tied). ...

This study examines the modulation of land-based extreme precipitation around globe by Madden-Julian Oscillation (MJO). The upper-level convergent phase MJO inhibits events over most regions but enhancement in other phases falls three categories. Over Brazil, Southeast Asia, and Australia, 2-year rainfall are common near core divergence as expected. For tropics subtropics, occur along periphery...

The long-term goal of this project is to developing a seamless weather and climate prediction system that has capability to predict accurately both weather phenomena such as tropical cyclones (TC) and other extreme weather events and longer climate-scale phenomena such as the Madden-Julian Oscillation (MJO) and the El Nino-Southern Oscillation (ENSO). Organized moist convections in the tropical...

The authors report a significant increase in Madden–Julian oscillation (MJO)–like variability in a superparameterized version of the NCARCommunity AtmosphereModel run with high sea surface temperatures (SSTs). A series of aquaplanet simulations exhibit a tripling of intraseasonal outgoing longwave radiation variance as equatorial SST is increased from 268 to 358C. The simulated intraseasonal va...

We present a statistical analysis of the initiation and termination of boreal winter and boreal summer intraseasonal oscillations (ISOs). This study uses purely convection (infrared brightness temperature) data over a 23-year time interval from 1984–2006. The indices are constructed via the nonlinear Laplacian spectral analysis (NLSA) method and display high intermittency and non-Gaussian stati...

Herewe ask, what controls the horizontal scale of theMadden-Julian Oscillation, i.e., what controls its zonal wave number k?We present a new one-dimensional (1D) β-planemodel that successfully simulates theMJO with the same governing mechanism as the 2D shallow water model of Yang and Ingersoll (2013). Convection is parameterized as a short-duration localized mass source that is triggered when ...

Abstract. Teleconnections from the Madden–Julian Oscillation (MJO) are a key source of predictability weather on extended timescale about 10–40 d. The MJO teleconnection is sensitive to number factors, including mean dry static stability, flow, and propagation intensity characteristics MJO, which traditionally difficult separate across models. Each these factors may evolve in response increasin...

Abstract The Madden–Julian oscillation (MJO) is the dominant intraseasonal wave phenomenon influencing extreme weather and climate worldwide. Realistic simulations accurate predictions of MJO genesis are cornerstones for successfully monitoring, forecasting, managing meteorological disasters 3–4 weeks in advance. Nevertheless, processes emerging precursor signals an eastward-propagating event r...