Figure 8 - available via license: Creative Commons Attribution 4.0 International
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Mean normalized ISOI for Warm and cool ENSO years, and the difference between Warm and cold ENSO years.
Context in source publication
Context 1
... remark can be further highlighted in Table 2 that displays interannual variations of the ISOI and ENSO indices within the study period. Figure 8 displays the mean ISOI for Warm ENSO and cold ENSO years, as well as the difference between the two values, for each grid point of our study area. As could be expected from the previous analyses, the difference is positive almost all over the study area, confirming that the average ISOI is higher for La Niña years, when compared with El Niño years. ...
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The influence of intra-seasonal oscillations (ISO) on rainfall in Central Africa (CA) is assessed using the National Oceanic and Atmospheric Administration Climate Prediction Center daily gridded rainfall data. ISO indices are defined using the time series analysis of the first two principal components resulting from the empirical orthogonal function, applied to daily filtered outgoing longwave radiation. Based on these indices, a total of 71 strong Intraseasonal Events (SIEs) and 66 weak Intraseasonal Events (WIEs) were selected using threshold method. The results show that SIEs are associated with enhanced rainfall conditions over almost all the study area, while WIEs provide a meridional dipole-like rainfall pattern, consisting of increasing precipitation in the western part and decreasing in the eastern part of CA. The relationship with Madden-Julian Oscillation (MJO) was also examined. The positive rainfall anomalies associated with MJO phases progress eastward and are modulated by the 850 and 200 hPa horizontal wind. The circulation, linked to geopotential height anomalies at lower layers, tends to strengthen (reduce) the convective activity over the region. Uncentered pattern correlation was further used to assess the link between ISO and MJO phases. We found a correlation of 0.5 in precipitation anomalies between phases 1 and 2 of the MJO and the SIEs; -0.4 and -0.6 between phases 5 and 6 and the SIEs respectively. This result suggests a strong relationship between ISO events and MJO phases.
