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Is Sanjiu really the coldest? Big data tells you what it takes to count nine

Original title: Is Sanjiu really the coldest? Big data tells you what it takes to count nine

China Weather Network News said that "the heat is in the three volts and the cold is in the nine nines". Today is the first day of the nine nines in all parts of the country. So is Sanjiu really the coldest time? What kind of cold is winter cold?

The record of "Number Nine" was first appeared in "The Chronicle of Jingchu" in the Southern and Northern Dynasties, and has a history of more than 1,400 years. From the winter solstice, the cold gradually accumulated. The ancients counted every nine days during this period as a group, and then they have the saying of "number nine", which has continued to this day.

See you in the winter

At the end of the year and beginning of the year, 1929 arrived. Every year from December 22 to early January of the following year, China enters the "1929" stage. At this time, it was cold at the beginning and was not very full. It was already winter in the north, and it was still warm in south China. The coldest Heilongjiang, the province's average temperature is lower than -18 ℃, just like a natural large ice storage, Beijing, Hebei, Shanxi, Shandong, the average temperature also fell below the freezing point, these places can not travel without a down jacket; Jiangsu, Sichuan The average temperature in Hubei is below 5 ℃, and it is necessary to wear thick cotton to keep warm. In the areas further south, the average temperature in Yunnan, Guangdong, and Guangxi can reach about 10 ℃, and Hainan is more than 20 ℃. The meaning is still strong, just wear spring and autumn clothes, and even summer clothes.

The north-south climate difference creates a unique bipolar tourism route in the winter— “cold to the north” and “cold to the south” to the south.

The challenging young people went north all the way to the Linhai Snowfield and to Chagan Lake to taste the fresh fish caught in winter. According to legend, the Liao Emperor Shengzong likes to eat "ice fish". Every year, the moon brings his servants to Chagan Lake to scrape the thick ice layer. . This winter fishing method continues to this day. During "1929" every year, the fish in Chagan Lake would cut a thick ice surface and lower the net into the flowing water at the bottom of the ice. Salvaged to the ice, it is very lively.

January 2013, Songyuan City, Jilin Province, Chagan Lake winter fishing scene. Wang Wei / Copyright Photo Source Visual China

The elderly and children are more willing to become "migratory birds" going south to enjoy the sunny beaches. Sanya in Hainan and Beihai in Guangxi have become rare places in winter. Temperatures above 20 ° C and fresh air attract a large number of people who come to rest. Migratory birds ".

In December 2019, in Sanya, Hainan, a child was playing with sand on the seashore of Sanya Bay. Chen Wenwu // Copyright Image Source Visual China

The extreme of three nine four nine cold

If "1920" opened the curtain of "cold", then "three nine forty-nine" is the official appearance of "cold". This period often overlaps with the small cold and big cold solar terms, and the cold stages continue to escalate, and the north and south temperatures drop to the bottom.

Statistics show that the temperature of the "Nine Nine" is generally the lowest in the north of China, while the "Nine Nine" is cold in many places in the south. This is directly related to solar radiation. At the beginning of the winter solstice, the amount of heat absorbed by the northern hemisphere during the day is reduced. At the beginning, there is still a stock of ground heat, but the stored heat is less and less every day. , The temperature has dropped to a minimum.

"The winter solstice is 39. The ice is strong." At this time, the northernmost Heilongjiang Mohe has an average temperature of about -30 ° C, and the lowest temperature can reach about -50 ° C. In North China, the rivers were frozen and firm, and Hukou Waterfall also entered the best period for viewing frozen wonders.

In winter 2018, Mohe, Heilongjiang, tourists play a game of splashing water into ice. Chu Fuchao / Copyright Photo Source Visual China

The south is also subjected to the test of low temperature. The air humidity in Jiangnan and Southwest is more than 70%, and the temperature near the freezing point is superimposed. The coldness is like a magic attack. It is as cold as an ice cellar in indoor and outdoor areas without heating. Nowhere to hide. Sometimes, when the power of cold air is strong enough, raindrops fall on the surface of telephone poles, trees, and roads, and freeze into a thin layer of ice, forming a "frozen rain" with southern characteristics. Hunan, Guizhou, and Jiangxi are the most frequent, which makes people cold to tremble Vehicles are also difficult.

On January 22, 2016, the "overlord" cold wave swept Guangdong, and freezing rain appeared in Qingyuan and Shaoguan. Photography: Zhu Yongjiang, Tsinghua University

Bottom five nine six nine rebound

Entering the "May Nine" period, the extreme cold is over. Temperatures across China have bottomed out and rebounded. According to the average temperature statistics of China Weather Network from 1951 to 2018, during the "May 9" period, the national average temperature returned to above freezing. , Showing signs of recovery.

By the time the temperature rise in the "June 9" increased, the average maximum temperature in South China, Southwest, and Jiangnan has reached or exceeded 10 ° C, and the breath of spring can already be felt. At this time, the willow tree, which is particularly sensitive to temperature changes, also smelled of spring. Most of the Jiangnan area followed the old saying of "looking at willows along the river".

In mid-February 2017, Hefei, Anhui, the major parks will shoot buds. Photography: Xu Yalian

Seventy-nine Eighty-nine River Kaiyan came

"Ninety-nine eliminate the cold", in fact, many places in the south of the "seven nine hundred and eighty-nine" have spring. At this time of year, the highest temperature in most of the south exceeds 10 ℃, and the average temperature generally crosses the 5 ℃ line, and the weather is gradually warm and comfortable. Spring in South China is full of blooming flowers; most of the southwest and south of Jiangnan are also an early spring scene ... Cherry blossoms in Chongqing and rapeseed flowers in Jiangxi have entered the viewing period, and people have begun their spring journey.

In mid-February 2019, the early cherry blossoms of Chongqing Beibei Agricultural Park were in bloom. Photo: Qin Tingfu

At the beginning of March 2019, in Jinggangshan, Jiangxi, the golden canola flower attracted bees to collect honey. Photography: Wu Hutu

At this time, although the northern part of China did not get out of the control of winter, the average temperature in Henan, Hebei, Beijing, Shanxi, Shandong and other places gradually crossed the 0 ° C line, and the river thaw. The animals were like the thermometers of the earth, and the animals first felt the spring Breath, the poet Song of the Song Dynasty Su Shi even wrote in Qianjing (Kaifeng) the ancient famous phrase "Three or Two Peach Blossoms outside the Bamboo River, the Spring River Plumbing Duck Prophet".

On February 21, 2019, the lake surface of Beijing Zoo began to melt, and birds such as mergans ducks came into play in the water. Photo: Yang Baohua

Come back to the earth in the spring

From the average data of perennials, the number of "Nine and Nine" is exhausted, and the pace of spring has reached the middle and lower reaches of the Yangtze River. Chongqing, Chengdu, Nanchang, Changsha, Wuhan and other places have gradually entered the spring. territory.

However, in recent years, the pace of spring is getting faster and faster, and more than 80% of the regions have entered the spring significantly earlier than the middle of the last century. Like the speeding up of trains, most regions have advanced more than 5 days in advance, such as Shanghai, Lanzhou, and Urumqi. , Shenyang, Zhengzhou, Tianjin and other places have an average spring time more than 15 days earlier than the 1950s.

As the climate varies from place to place, the situation in several places is slightly different, but in general, after experiencing the "98 days of 1981" cold winter, we will finally have a warm spring. (Text / Zhang Hui Design / Luo Jiaxue Data Support / Shen Ziqiang Review / Hu Xiao Zhang Fangli Chen Xi Liu Hongxin) Back to Sohu, see more

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