Climatic characteristics of Tomb-Sweeping Day

Tomb-Sweeping Day will be here soon. What will happen to the climate? Here I will introduce the climate characteristics of Tomb-Sweeping Day. Welcome to reading.

Tomb-Sweeping Day's climate features are clear, and it is a solar term representing phenology, which means sunny weather and lush vegetation. As the saying goes:? Snow breaks in Qingming Festival, and frost breaks in Grain Rain. ? When the weather is clear, the climate in South China is warm and the spring is strong. However, before and after Tomb-Sweeping Day, cold air still invaded from time to time, even making the average daily temperature lower than 12℃ for more than three consecutive days, resulting in rotten seedlings of middle rice and dead seedlings of early rice. Therefore, it is necessary to avoid warm tail and cold head when sowing and transplanting rice. In the northwest plateau, livestock are weak under the influence of severe winter and insufficient forage, so it is necessary to guard against the harm of strong cooling weather after spring to old, weak and young livestock.

In the next season, the temperature is getting warmer, plants are sprouting, the weather is clear, everything is thriving, and clarity is clean. With the arrival of Tomb-Sweeping Day gas, the atmospheric circulation in East Asia turns from winter to spring. The ridge of westerly belt moves frequently, and the low-level high and low pressure appear alternately. The temperature in the Jianghuai area changes greatly, and unstable precipitation such as thunderstorms gradually increases.

The temperature in northern China rises rapidly, precipitation is scarce, and it is dry and windy, which is the time of dusty weather in a year. The average temperature in April in many northern areas has reached 10℃ ~ 15℃. Although spring has not yet come in parts of northeast and northwest China, according to the surface climate data of China 197 1 ~ 2000, the average extreme maximum temperature in Hohhot in March has reached 19.4℃, Xining 23. 1℃ and Qiqihar 23.0℃. During the Qingming period in mid-April, the vegetation in mountain forest fields germinated, which coincided with the spring outing, grave sweeping and tree planting season, so it is very important to prevent forest fires.

Rainfall in the middle and lower reaches of the Yangtze River increased significantly. Except for the eastern coast, the average rainfall in April in most areas of the south of the Yangtze River is above 100 mm. If the cold air is strong, there will be low-temperature rainy weather with the daily average temperature below 10℃ for more than three consecutive days, and insufficient sunshine will seriously affect the growth of warm crops such as early rice and cotton.

South China is located in the south, close to the ocean, and when it is affected by the front formed by the intersection of cold and warm air, heavy precipitation begins to appear, which is called the pre-flood season in South China. Among them, the average rainfall in northern Guangdong and northern Fujian in April exceeded 200 mm, and the rainfall intensity ranked first in the country. Whenever the thermal convection in the rain belt develops vigorously, there will be strong convective weather such as thunderstorms and heavy rain, which is worthy of vigilance.

? Planting melons and beans around Qingming? During the period of Tomb-Sweeping Day, except the northeast and northwest, the daily average temperature in most parts of the country has risen above 12℃, and from the north and south of the Yangtze River to the inside and outside of the Great Wall, there are busy scenes of spring ploughing everywhere. ? During the Qingming Festival, wheat grows in three stages? Wheat in the southern part of Huanghuai is about to start booting, rape has been in full bloom, and wheat in the northeast and northwest regions has also entered the jointing stage. In the later stage, we should pay close attention to fertilizer and water management and pest control.

Tomb-Sweeping Day, Tomb-Sweeping Day is the fifth solar term in the twenty-four solar terms of the lunar calendar, which indicates the official start of the Spring Festival travel rush season. When the sun reaches longitude 15 degrees, it will be Tomb-Sweeping Day gas.

"Almanac": Fifteen days after the vernal equinox, fighting refers to Ding. Everything is clean and bright when it is clear, and everything is clean and bright when it is covered.

In China, in the 15 days from Qingming, there are three waiting periods every five days: one is to wait for tung to blossom; Second, the vole became a quail; See you after the rainbow. That is to say, at this time, the white paulownia blooms first, then the happy voles disappear in the shade, and all return to the underground caves, and then the rainbow can be seen in the sky after the rain.