Zhang Wanying
Hello!
Today we started our lesson with a question: what did the rain come from last night? We were split into groups to discuss the question. So basically, the answer is, there are monsoon seasons happening twice each year in Singapore. The first one is the Northeast Monsoon which occurs from December to early March. The second is the Southeast Monsoon season which occurs from June to September. So now we are in the Northeast Monsoon. During the Northeast Monsoon, the place that receives the most amount of sunlight moves from the tropic of Capricorn to the equator. As a result, air of north part of the earth is cool and it sinks; air of south part of the earth is hot and it rises. The air moves up and down between tropic of cancer and tropic of Capricorn. Because of coriolis force which is due to earth’s rotation, air moves in this way:
The wind comes from northeast (so the wind is called ‘northeast wind’) of Singapore. As we can see on the map, the arrows indicate the direction of the wind. As a result, the wind brought the moisture of the South China Sea to Singapore. That’s why it was raining heavily last night.
From June to September is the Southeast Monsoon season. The place that receives the most amount of sunlight moves from the tropic of cancer to the equator. Hence air of north part of the earth is hot and the air of south part of the earth is cool, and air moves from south to the north. The air comes from Indian Ocean towards Singapore. Because of the unequal heating of land and sea, the air flows in the direction shown in the map below. However, there is an island with volcanoes called Sumatra blocking the air from Indian Ocean to Singapore. Hence, from June to September, Singapore is relatively dry. However, there is still convectional rain. It still get low amount of rainfall.
posted by 08ip01 at
11:31 PM
3 Comments:
Will there be any wind come from the Straits of Malacca from December to early March?
Zhao Pei
The wind brings moisture from the Southchina sea to Singapore, as a result, there was rain. But may it not be the case that the rain was also partly the result of convectional rain which occurs very frequently in the region too?
The rain came in the morning so its not possible that it was convectional rain. Convectional rain usually occurs in the afternoon/evening as the moisture along with the air above the ocean heats up and rises. As it rises it cools down and forms clouds in the sky. When the clouds become saturated with moisture, it rains and its usually in evenings/afternoons.
Monsoonal rains, as said above are caused by the movement of winds which is due to corolis force.
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