Climate change in Xi 'an.

Xi is a warm temperate semi-humid continental monsoon climate with four distinct seasons, mild climate and moderate rainfall. Spring is warm, dry and windy; Summer is hot and rainy, and there are many thunderstorms and windy weather; Autumn is cool, the temperature drops rapidly, and autumn showers are obvious; Winter is cold, foggy and less rainy and snowy.

Xi 'an is located in the Guanzhong Basin in the middle of the Yellow River Basin, between east longitude107 40'-109 49' and north latitude 33 42'-34 45'. The eastern part is bounded by Zero River and Yuanqiu Mountain, and is connected with Weinan City, Shangzhou District of Shangluo City and Luonan County. It is bounded by Taibai Mountain and Qinghai Loess Plateau in the west, and borders Meixian County and Taibai County.

South to the main ridge of the North Qinling Mountains, bordering Foping County, ningshan county County and Zhashui County; It reaches Weihe River in the north and crosses Weihe River in the northeast, and is adjacent to Xianyang City, Yangling District and Sanyuan, Jingyang, Xingping, Wugong, Fufeng and Fuping counties (cities). It is 204 kilometers long from east to west and 1 16 kilometers wide from north to south. Total area 10 108 square kilometers, of which the urban area is 3582 square kilometers.

topography

The geological structure of Xi 'an is divided into two units: Qinling geosyncline fold belt and North China platform. About 654.38+0.3 billion years ago, during the Yanshan Movement, a large fault occurred across the northern foot of Qinling Mountains. Since the Neogene about 3 million years ago, the neotectonic movement in the Qinling geosyncline fold belt south of the great fault has been extremely active, and the mountains have fallen sharply from north to south, creating the Qinling Mountains.

At the same time, the Weihe fault depression, which belongs to the North China platform to the north of the great fault, continued to subside, and the Weihe plain was formed under the joint action of aeolian loess cover and Weihe alluvial. The altitude difference in Xi 'an ranks first among the cities in China. The Qinling Mountains, with its steep and beautiful peaks, and the wide and flat Weihe Plain have clear boundaries, which constitute the main landforms of Xi 'an.

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