Why did it snow so early in Hebei this year? Is it only September, or is the global climate abnormal?

First, when we see a snowy place, such as September, we can pay attention to the latitude and altitude at two points.

As we all know, the higher the altitude, the lower the temperature. As can be seen from the contour topographic map, the elevation of Guyuan County is.

There may be errors around 1400m, which can be used as a general reference. Then at an altitude of 1400m or so, the temperature can probably be higher than that in the plain area with tens of meters above sea level and the same latitude.

About 9 degrees lower. Except for altitude, the latitude of Guyuan County is about 4 1 degree north latitude, which is relatively high.

The higher the temperature is, the closer it is to the cold air source, the higher the direct angle of the sun decreases with the increase of latitude, and the lower the relative temperature is. But there is one

Under some special circumstances, the south will be colder than the north. It's rainy in the south, and when it's clear in Wan Li in the north, it's because of clouds.

Part of the short-wave radiation of the sun causes the ground temperature to be lower than that in the north.

Second, of course, it is not enough to meet the temperature. Snowfall also needs certain water vapor conditions. At that time, there was a cold front of an extratropical cyclone in Guyuan county, which lifted the air mass in front of it and condensed it into a cloud guide.

It caused the snowfall. People in Hebei think it is North China, and Zhangjiakou is the northernmost city in Hebei. Where is Guyuan? Several districts and counties on Zhangjiakou dam belong to the Mongolian plateau, and the cold air from Siberia comes straight without hindrance. The temperature ratio this winter

The weather in the northeast is cold, and frost has appeared some time ago. Sometimes it snowed in September before, but it didn't attract as much attention as this year. The first snow in Bashang area is usually at the end of September1early October, and the last snow will be around May next year. It has been here for many years.

There is nothing to make a fuss about.

Third, it's normal to snow in Zhangjiakou, and it's common to have more than 30 degrees below zero. I was curious when I first went there, and insisted on herding sheep in the mountains. My nose is almost frozen. The energy of the earth is conserved, but it fluctuates within a certain period of time, and sometimes the deviation value is relatively large. It is too hot in spring and summer, and it must be very cold in autumn and winter. The same is true of rainfall. The south, especially the southwest, is dry in spring and summer, and the autumn flood season may be very heavy, with heavy losses. The summer in the whole northern hemisphere is unprecedentedly hot, and the summer temperature in high latitudes such as northeast and north is higher. Then, the temperature is definitely low in autumn and winter. The temperature rises too fast in spring and summer this year, and it is possible that the temperature drop in autumn is also cliff-like.

Zhangjiakou, Zhangbei, Guyuan, Shangyi and Kangbao four Bashang counties, different from other places in Hebei, are located in the Inner Mongolia Plateau outside the Great Wall.

In fact, the average altitude is 1500 meters or more. The whole dam is covered with grassland, and all the trees are the products of the former Three-North Shelterbelt. Economy is Inner Mongolia.

The junction of ancient grassland and North China Plain is a bitter and cold place, which is dominated by agriculture and animal husbandry. Because it is located in the tuyere of the route of North China Plain in Siberia, Mongolia and Inner Mongolia, the wind is extremely strong, usually blowing twice a year, once and a half.

A few years. The coldest time in winter is about MINUS 30 degrees, generally MINUS 10 to 20 degrees, which is similar to that in Jilin and Heilongjiang.

In Hebei province, there is a sense of forcibly splitting administrative divisions, and it was almost placed in Inner Mongolia that year.

Zhangjiakou area has basically been in a state of blockade control, and there is no pillar industry. The local economic situation is really unhappy.

Check that even if you come back from a low-risk area, you will be taken directly away from the station airport and isolated at your own expense; The traffic between counties is also in the middle.

Paralysis. The State Council transited to epidemic prevention in informed criticism, and the whole city of Zhangjiakou was in an uproar. Bashang area is very dry this year, and there are several frosts now. The corn in the field is not waist-high and other crops are not knee-high.

High, in addition to agricultural damage, animal husbandry will also suffer heavy losses. It must be particularly cold this winter, and the problem of insufficient dry forage for cattle and sheep is now.

Start solving it, or winter will be over.

Fifth, because in the early ice age, greenhouse gases were also released in large quantities, and extreme weather would be more and more, so agriculture that depended on the weather faced great challenges.

Challenge. If ordinary farmers don't realize this, they will lose a lot. And the temperature difference between day and night is very large every day. Crops are almost all corn, potatoes, naked oats and the like. Grapes are famous because

The temperature difference is large.

The temperature in Zhangjiakou can be compared with that in the three northeastern provinces. It blows twice a year, and the two things that local farmers are most afraid of for half a year are gale cooling and hail.

A few times a year is very difficult.

There are ways to prevent it, but the cost is too high, such as adding protective nets to grapes to prevent hail.

But celery and the like can't help it. After the hail hits the pit, it will be abandoned and cannot be transported, so it can only be used as fertilizer.

To correct it, Chongli does not belong to Bashang, I mean the northwest of Zhangjiakou, probably this area.