摘要
分析了广东干旱害的气候成因 ,特别对 1998年下半年以来广东气候异常、旱情严重、春耕生产受阻作了具体分析 ,并提出了防御干旱害的对策。
Climaic causes of the spring-drought and autumn-drought are analysed.The serious drought disaster in 1998 are discussed in detail. Some countermeasures against drought are put forward. Spring drought mainly takes place in southern and central parts of Guangdong, the main causes of the spring drought are: 1)When the winter monsoon is so strong on the mainland that summer monsoon can not come into the province in time, the early spring drought often occurs; 2)If the subtropical high pressure over northwest Pacific Ocean (including South China Sea) extends westwards and northwards earlier, the warm air mass will be very strong, and most parts of the mainland will be controlled by the summer monsoon. Although a great deal of water vapor comes into the area, the cold and warm air masses meet to the north of Guangdong, and less rain falls on the province and late spring drought occurs; 3)The cold and warm air masses meet in the area, but the cold air mass from north becomes very weak when arrives in the province, most of the water vapor has been changed into rain at the north side of the Nanling mountain ranges because of the countercheck effect.The autumn drought mostly take places in North Guangdong, the main causes of its formation include: 1)weak activity of the tropical cyclone; 2)strong subtropical high pressure over northwest Pacific Ocean.
出处
《热带地理》
北大核心
2000年第1期16-21,共6页
Tropical Geography
关键词
广东
干旱
旱灾
气候成因
防御对策
Spring dronght
Autumn dronght
Climate abnormity
Guangdong
