{\section*{1. Tropical Intraseasonal Oscillation}}

The Tropical Intraseasonal Oscillation (ISO) is the predominant phenomenon in the tropics throughout the year, and it is characterized
by large-scale convective anomalies that modulate tropical atmospheric circulation on 30-90 day-timescales.
Following [2], we differentiate between two modes of ISO: \textbf{the Madden-Julian Oscillation (MJO)} and \textbf{the Boreal Summer ISO (BSISO)}.
These phenomena are evaluated employing Empirical Orthogonal Function (EOF) analyses, as well as wavenumber-frequency power spectra.


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\includegraphics[width=0.4\textwidth]{freq_iso.png}
\includegraphics[width=0.8\textwidth]{power_spectrum.png}
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