What does the northward shift of precipitation line in China mean? What does the northward shift of precipitation line in China mean?

Lead: The precipitation line in China is bounded by the Qinling Mountains, but in recent years, the precipitation line has moved northward, and the trend is very obvious. Recently, some friends in Bian Xiao began to have a good understanding. What does the northward shift of precipitation line in China mean? What does the northward shift of precipitation line in China mean? Next, please collect the contents carefully prepared by Bian Xiao, hoping to help everyone.

What does the northward shift of precipitation line in China mean?

deposit

China's precipitation line moves northward, which means more rainfall in the north. The northward shift of China precipitation line makes the rainfall in northern China increase year by year, which also shows that the water resources on the earth's land are being redistributed, and the rainfall changes from south to north.

The northward shift of the precipitation line in China will lead to more precipitation in places with less precipitation, such as the North China Plain. At the same time, North China is also the main wheat producing area. With the increase of precipitation and China's investment in agricultural science and technology, the grain output in northern China is likely to increase year by year. But more precipitation will also make the flood disaster more serious.

Global warming, El Ni? o and La Ni? a phenomena, sea surface temperature, subtropical high and other climatic factors may affect and increase rainfall in northern China. The increase in rainfall on the Qinghai-Tibet Plateau is attributed to global warming.

Since around 2000, the main precipitation belts in China have been distributed from South China and the Yangtze River Basin in Huanghuai Basin, and there is a tendency to shift year by year. Today, the vegetation in Xinjiang is running at the speed of one hundred and fifty kilometers per year; Plants in Inner Mongolia have also recovered rapidly at a speed of 40 kilometers, and a large number of succulent broad-leaved trees have also appeared in Heilongjiang forest area.

Precipitation picture

General distribution law of isoprecipitation line;

1, there are dense isorainfall lines in areas with large differences in precipitation distribution. On the contrary, in areas with small differences in precipitation distribution, isohyets are sparse.

2. Isoprecipitation line is roughly parallel to the coastline, and decreases from the coast to the inland.

3. Precipitation is greatly influenced by topography, and the isoprecipitation line is roughly parallel to the trend of mountains. The precipitation on the windward slope in mountainous areas is large; There is almost no precipitation on the leeward slope of the mountain range.

4. Isoprecipitation lines are closed in high-lying areas or inland areas with little precipitation.

5. In coastal areas where warm current flows, precipitation increases, while in coastal areas where cold current flows, precipitation decreases.

6. Three-circle cycle

The equatorial depression and the sub-polar depression control the precipitation.

Subtropical high pressure area and polar high pressure area control, less precipitation;

The west coast of the mainland is controlled by the westerly belt, with a lot of precipitation. If it is lifted by the terrain, there will be more precipitation.

The east coast of the mainland is controlled by the trade wind belt. If there is topographic uplift, there will be more precipitation.

7. Monsoon circulation:

Summer monsoon control, more precipitation;

Wind control in winter, less precipitation;

If winter winds cross the vast ocean and the terrain rises, there may be more precipitation.

8. If the city has a "rain island" effect, the precipitation line will be larger as it goes to the center of the city.

Attachment: the cause of urban "rain island" effect: prevailing updraft; Polycondensation nucleus; Tall buildings block the weather system.

rain

What is the long-term impact of the northward movement of rainfall belt on China?

The long-term impact of the northward movement of the rainfall belt on China is that the seasonal northward movement to the eastern part of northwest China, Hanshui River Basin, Huanghuai, south-central North China and other places will obviously increase the number of strong convective weather such as high intensity and persistent heavy rainfall, and the flood control situation in the main flood season in northern rivers is severe, and floods may occur at any time.

North America and the Middle East, which have the same latitude as southern China, belong to semi-arid desert or desert climate under the influence of monsoon circulation.

The Qinghai-Tibet Plateau blocks the humid air from the East China Sea, leaves the moisture in the middle and lower reaches of the Yangtze River, and blocks the warm and humid airflow from the Indian Ocean, so it is easy to form a dry desert climate in northwest China.

Climate types in China.

tropical monsoon

Include southern Taiwan Province Province, Leizhou Peninsula, Hainan Island and Xishuangbanna. The annual accumulated temperature is 8000℃, the average temperature in Leng Yue is not lower than 15℃, the annual extreme minimum temperature is not lower than 5℃ on average for many years, and the extreme minimum temperature is generally not lower than 0℃, and there is no frost all year round.

Subtropical monsoon

China, South China and East China all belong to this climate type. The annual accumulated temperature is between 45,008,000℃, and the average temperature in Leng Yue is 0 15℃, which is a transitional zone between subtropical zone and temperate zone. The temperature is very high in summer and very low in winter.

Temperate monsoon

North China belongs to this climate type. The annual accumulated temperature is between 30,004 and 500℃. The average temperature in Leng Yue is -280℃, and the average temperature in summer is still above 22℃. It is rare to see the temperature exceeding 25℃, which is warmer and cooler. In recent years, due to climate warming and other reasons, high temperature weather frequently occurs in southern North China, but the average temperature still does not exceed 25℃.

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