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The Enigma of Southeast Monsoon in China.

It has always been taken for granted that southeast monsoon in China, like the southwest monsoon in India, is a rainbearing wind. Yet the southeasterly wind in eastern part of China is a dry wind in summer as well as in winter, and in the Yangtze Valley, when it blows consistently, drought is imminent. These facts were known to ancient Chinese philosophers, and one famous poet of Sung dynasty wrote to the effect that when the southeast wind blows, the rainy season is at an end. Recent observations confirm this statement. The apparent paradox is explained by the fact that rainfall in China is mostly cylonic in origin, and not orographic, as in India; and that most of the preci-pitation occurs in the cold sector. It is necessary to have a northerly or nor-theasterly current to lift the southeast monsoon to sufficient height before it will yield its quota of moisture. The paper is discussed under seven headings. (1). Southeast monsoon in ancient Chinese literature. (2). The causes of mon-soonal winds. (3). Monsoon in India. (4). Difference between monsoons in India and those in China. (5). Factors which give rise to precipitation in eastern part of China. (6). The confiirmation of the statement of Sung Poet. (7). Why the Southeast monsoon bring about the drought.
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