Is the rainfall of 20 18 more or less than that of 20 17? Annual rainfall forecast in 20 18.

There will be precipitation everywhere every year, and the distribution is similar in general. But the annual rainfall will still fluctuate. Then, is the rainfall of 20 18 more or less than that of 20 17? What is the rainfall in 20 18?

Rainfall forecast in 20 18 years

The annual average precipitation in China is about 6+e 12 cubic meters, which is equivalent to the average precipitation depth of 628mm, which is less than the global average of 834mm and the Asian average of 740 mm. Of these precipitation, 56% is consumed by soil and surface water evaporation and plant transpiration, and the remaining 44% forms runoff. The average annual runoff of rivers in China is 2.6+ 12 cubic meters, of which the snowmelt of glaciers is about 5× 10m. The total amount of groundwater in China is about 8× 10m. Due to the close relationship and mutual transformation between surface water and groundwater, these two resources are somewhat repetitive in quantity. After deducting this part of repeated water use, the national average total water resources for many years is about 2.7+e 12 cubic meters m.

Is the rainfall of 20 18 more or less than that of 20 17?

1, there is no clear answer.

The rainfall intensity standard generally adopted by meteorological departments in China is:

1, light rain: 12 hours with rainfall less than 5mm, or 24 hours with rainfall less than10 mm;

2. Moderate rain: the rainfall within 12 hours is 5- 14.9mm, or the rainfall within 24 hours is10-24.9 mm;

3. Rainstorm: 12 hours rainfall 15-29.9mm, or 25-49.9mm in 24 hours rainfall. ..

The quantitative standard of rainstorm varies from place to place, depending on the specific situation. In meteorology, according to the intensity of heavy rain, there are roughly three levels:

1, rainstorm: 12 hours rainfall is equal to or greater than 30mm, or 24 hours rainfall is equal to or greater than 50 mm.

2. Rainstorm: 12 hour rainfall is equal to or greater than 70 mm, or 24-hour rainfall is equal to or greater than 100 mm;

3. Extraordinary rainstorm: 12 hours rainfall is equal to or greater than 140mm, or 24 hours rainfall is equal to or greater than 250mm. Average rainfall in a certain period. It can be expressed by rainfall depth per unit time (mm/min) or rainfall per unit area per unit time (L/(s ha)), and it is an important index to describe rainstorm. The greater the intensity, the more violent the rain. It is particularly meaningful to calculate the maximum average rainfall intensity corresponding to a certain duration. Obviously, the shorter the duration, the greater the rainfall intensity, and high-intensity rainfall often occurs in areas with high annual rainfall.

Annual rainfall 20 17

In 20 17, there will be more rainfall in the whole country, and the number of precipitation days will tend to be normal. However, we should be wary that there will be drought in the north and drought in the south in summer, and the number of days with high temperature above 35 degrees will be significantly more than this year.

The ENSO forecast system of the Institute of Atmospheric Sciences, Chinese Academy of Sciences predicts that the temperature in most parts of China will be low in the winter of 20 17, and the dusty weather in northern China will be slightly normal in the spring of 20 17. In the winter of 20 17, the national average temperature was lower than in previous years, with more precipitation in the south and less haze days in the north.

In 20 17 years, the climate will be extremely high or low. The spring of 20 17 comes late, which is cold, rainy and foggy, and the low temperature disaster; 20 17 is hot in summer, with long duration of hot weather, little rain, drought and regional floods; 20 17 autumn temperature is high and there are many typhoons, so pay attention to prevention; The winter in 20 17 was obviously colder than normal, and there was a blizzard attack.

20 17 why is there so much rain in the south in summer?

China's climate is characterized by high temperature and rainy summer, cold and little rain in winter, and the high temperature period is consistent with the rainy period. Because China is located in the east of Eurasia, the largest continent in the world, on the west coast of the Pacific Ocean, and near the Indian Ocean in the southwest, the climate is greatly influenced by the mainland and the ocean. In winter, the north wind blows from the mainland to the ocean, and in summer, the south wind blows from the ocean to the land. Winter winds are produced in the interior of Asia, which is cold and dry. Under its influence, there is little precipitation and low temperature in most parts of China in winter, especially in the north. The summer monsoon comes from the Pacific Ocean in the southeast and the Indian Ocean in the southwest, and it is warm and humid. Under its influence, precipitation generally increases, and rain and heat are in the same season. In summer and autumn, the southeast coast of China is often hit by tropical storms-typhoons. Typhoons (called typhoons when tropical storms develop to a particularly strong degree) are the most frequent from June to September.