Figure 4 | Scientific Reports

Figure 4

From: Increased sporadic extremes decrease the intraseasonal variability in the Indian summer monsoon rainfall

Figure 4

Mechanism in a flowchart. Flowchart for the mechanism of the decrease in seasonal mean and low-frequency intraseasonal variability strength over India. Increased extreme rainfall events in the break phases weakens the easterly vertical shear over the northern Indian region. This weakens the instability over the region, causing the lesser convective activity in subsequent active phase. This fact is supported by the the fact that the stability over CI has increased when we have more extreme events, especially during breaks. Weaker vertical shear creates favourable conditions for the growth of deep convective storms, providing a feedback in process. Since majority of the seasonal mean rainfall occurs during the active phase, this decrease in active phase rainfall decreases the seasonal mean. Reduction in active phase rainfall also incapacitates variability in low-frequency intraseasonal scale, which in turn, weakens the LF-ISO intensity. Figure is generated using Microsoft Powerpoint 2010 (https://products.office.com/en-us/microsoft-powerpoint-2010).

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