Climate Dynamics

, Volume 46, Issue 5–6, pp 1473–1502 | Cite as

Extraction and predictability of coherent intraseasonal signals in infrared brightness temperature data

  • Eniko Székely
  • Dimitrios Giannakis
  • Andrew J. Majda
Article

Abstract

This work studies the spatiotemporal structure and regime predictability of large-scale intraseasonal oscillations (ISOs) of tropical convection in satellite observations of infrared brightness temperature (\(T_b\)). Using nonlinear Laplacian spectral analysis (NLSA), a data analysis technique designed to extract intrinsic timescales of dynamical systems, the \(T_b\) field over the tropical belt \(15^{\circ }\hbox {S}-15^{\circ }\hbox {N}\) and the years 1983–2006 (sampled every 3 h at \(0.5^{\circ }\) resolution) is decomposed into spatiotemporal modes spanning interannual to diurnal timescales. A key advantage of NLSA is that it requires no preprocessing such as bandpass filtering or seasonal partitioning of the input data, enabling simultaneous recovery of the dominant ISOs and other patterns influenced by or influencing ISOs. In particular, the eastward-propagating Madden–Julian oscillation (MJO) and the poleward-propagating boreal summer intraseasonal oscillation (BSISO) naturally emerge as distinct families of modes exhibiting non-Gaussian statistics and strong intermittency. A bimodal ISO index constructed via NLSA is found to have significantly higher discriminating power than what is possible via linear methods. Besides MJO and BSISO, the NLSA spectrum contains a multiscale hierarchy of modes, including the annual cycle and its harmonics, ENSO, and modulated diurnal modes. These modes are used as predictors to quantify regime predictability of the MJO amplitude in \(T_b\) data through a cluster-based framework. It is found that the most predictable MJO regimes occur before the active-MJO season (November–December), when ENSO has a strong influence on the future statistical behavior of MJO activity. In forecasts initialized during the active-MJO period (February), both ENSO and the current state of MJO are significant predictors, but the predictive information provided by the large-scale convective regimes in \(T_b\) is found to be smaller than in the early-season forecasts.

Keywords

Tropical intraseasonal oscillations MJO Dimension reduction Regime predictability 

Notes

Acknowledgments

The research of Andrew J. Majda and Dimitrios Giannakis is partially supported by ONR MURI grant 25-74200-F7112. Eniko Székely is supported as a postdoctoral fellow through this grant. The authors wish to thank Wen-wen Tung for stimulating discussions.

Supplementary material

382_2015_2658_MOESM1_ESM.mp4 (130.7 mb)
Supplementary material 1 (mp4 133872 KB)
382_2015_2658_MOESM2_ESM.mp4 (57.9 mb)
Supplementary material 2 (mp4 59279 KB)
382_2015_2658_MOESM3_ESM.pdf (27 kb)
Supplementary material 3 (pdf 26 KB)
382_2015_2658_MOESM4_ESM.pdf (192 kb)
Supplementary material 4 (pdf 192 KB)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Eniko Székely
    • 1
  • Dimitrios Giannakis
    • 1
  • Andrew J. Majda
    • 1
  1. 1.Courant Institute of Mathematical SciencesNew York UniversityNew YorkUSA

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