The figure shows a schematic of Indian Ocean surface circulation. This pattern is representative of the circulation in which month of the year?
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The Indian Ocean surface circulation is strongly affected by seasonal monsoonal winds, with May being the month when the Southwest Monsoon begins to influence the region's circulation.
The Indian Ocean exhibits a unique circulation pattern due to the seasonal shifts in wind patterns associated with the monsoon. This pattern is strongly influenced by the changes in the winds that occur as part of the Southwest Monsoon and Northeast Monsoon. The circulation pattern depicted in the schematic corresponds to a time when the winds are reversing, and the pattern is typical for May when the Southwest Monsoon begins to set in.
Step 1: Understand the Indian Ocean circulation
During the Southwest Monsoon (which typically starts in May and peaks in June–September), the wind direction reverses. The prevailing winds blow from the southwest, creating surface currents that flow from the southwest towards the northeast in the northern part of the Indian Ocean and from the southeast towards the northwest in the southern part.
Step 2: Analysis of the schematic
The circulation pattern shown in the figure, with the surface currents flowing from the southeast towards the northwest and from the southwest towards the northeast, is characteristic of the transition from the pre-monsoon period to the onset of the Southwest Monsoon, which happens in May. This is when the winds start to shift direction, marking the beginning of the monsoon season.
