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Explain how seasonal changes in atmospheric circulation have led to seasonal variations in the tropical climate you have studied.
10 marks The weather experienced in regions which experience a Tropical Wet-Dry climate is related to the movement of the ITCZ and the Hadley cell.
This is a transitional climate between Equatorial and hot desert regions and in Africa it covers much of the central area outside the Western Equatorial zone including countries in the Northern Hemisphere such as Northern Nigeria, Sudan, and Tanzania and Angola in the Southern Hemisphere. It is characterised by high temperatures all year around (25-35 degrees c) with wet summers and dry winters.
The weather which is experienced is related to the movement of the ITCZ which follows the migration of the overhead sunlight between the Tropic of Cancer to the Equator to the Tropic of Capricorn. In summer (June) the ITCZ moves north following the migration of the overhead sun to the Tropic of Cancer (23 degrees) which brings areas such as Nigeria under the influence of the ITCZ and its associated low pressure system. This brings seasonal convectional rains and high humidity. Temperatures are hottest in early summer but as the low pressure causes the build up of cloud and rain temperatures are moderated.
The winds from the high pressure cells to the north and south converge towards the ITCZ as they are pulled into the low pressure zone. The areas closer to the Equator experience several months of rainfall whilst those nearer to deserts zones will be drier.
In winter (Dec in the N Hemisphere) tropical wet dry areas in the northern hemisphere (eg Nigeria) will lie under the influence of sub-tropical high pressure cells. When the overhead sun is shining directly close to the Equator this pattern of descending air creates anticyclonic conditions at around 30 degrees north and south of the Equator creating desert areas. However as the overhead sunlight has shifted south to the Tropic of Capricorn the high pressure zone also moves south which means areas such as Nigeria experience high pressure. This is when the area has a hot, dry season with very little rain or drought. The winds blow outwards and there are cloudless skies caused by the subsiding air.

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