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《Acta Geographica Sinica》 1983-01
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RELATIONS BETWEEN VERTICAL CIRCULATION ALONG 115°E AND MOVEMENT OF RAIN-BAND IN THE EASTERN CHINA

Zha Liang-song (Department of Meteorology, Nanjing University)  
In this paper, the variation of decade (10 days) rain-band during flood season in the eastern China is investigated. It has been found that the seasonal migration of rain-band is closely related to the movement of the wedge line of subtropical high at the 500 mb level, the displacement of subtropical jet and the variation of the vertical circulation along 115°E. According to the synoptic situation and climatic features, the vertical circulation asso-ciated with decade rain-band of 1978 and 1979 may be classified into five types: (1) The Spring rainfall type in the south of the Yangtze river Fig. 1 shows the distribution of decade rain-band and vertical circulation along 115°E in this case. It is characterized by the existence of the direct circulation cell between 26°N and 34°N. The rain-band connecting to the ascending branch of the cell lies between the Yangtze river and the Nanling mountains. The wedge line of subtropical high is located at about 14°N. The axis of 200 mb subtropical jet maintains at 30°N. In general, this type appears in April and May. (2) The rainfall type in south China in the early Summer An example of this is shown in Fig. 2. The axis of rain-band in correspondence with the north ascending branch of monsoon circulation cell, which is near Kuangzhou, extends along the Nanling mountains and rainfall is quite heavy. At this time, the axis of subtro-pical jet is located at 36°N. This type appears from 2nd decade of May to 1st decade of June. (3) The plum raift type in the Yangtze and the Huaihe valleys An example of this type is shown in Fig. 3. It is characterized by the existence of the strong monsoon circulation cell and the east:-west plum rain-band corresponding to the as-cending branch of the cell. It can be seen that the rain-band lies in the Yangtze valley, and the wedge line of subtropical high is located at about 22°N, but the axis of subtropical jet still maintains at 35?36°N. The northerly wind prevails in the upper part of the tropo-sphere. The Qinghai-Tibet high at 100 mb level belongs to "the west type". (4) The persistent drought type in the Yangtze and the Huaihe valleys in mid-Summer This type appears in July and August. Fig. 4 shows the distribution of rain-band and vertical circulation along 115°E in 1st decade of July, 1978. It can be seen that the southern component of wind and the descending motion predominate in the whole troposphere. And in the vast subtropical regions of south to the 33°N persistent drought occurs. The wedge line of subtropical high is located at about 26°N. The Qinghai-Tibet high belongs to "the east type".(5) The drought type in the Yangtze and the Huaihe valleys at the end of summer, meanwhile rain area shifts to the further north in North China. A selected case is shown in Fig. 5. It shows that the monsoon circulation cell is very strong and stable in North China. The rain-band corresponding to the ascending branch of the cell lies in North China, while in those vast regions of south to the 35°N drought ap-pears because of strong descending motion, except the south-eastern coast of China, where some new rain areas occur. In addition, the wedge line of subtropical high is located at 34°N, and the axis of subtropical jet advanced to 45°N. The strong ascending motion just appears on the south side of the axis. Some results of this paper might have indicative significance for long-range forecast of rainfall tendency.
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1 Chen Jian;Lu Ding huang;DIVISION OF MONSOON CLIMATIC REGIONS IN CHINA[J];;1981-04
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