Will it snow in the equator? In many people's minds, the equatorial zone is hot all year round and does not snow unless it is in high mountains. For example, the Kilimanjaro near the equator has an altitude of 5890 meters, and the top of the mountain has constant snow for thousands of years.
But the near the equator Cameroon snowed, which is incredible. Cameroon has a tropical climate, with an average annual temperature of 24°C in the country. There should be no snow in such areas. Meteorological experts say that global warming has led to a "two-pole pattern" of temperature in the northern and southern hemispheres.
It is not the first time that it has snowed in tropical and subtropical areas. In history, my country’s Hainan Island also experienced extreme snowy weather. Records indicate that starting from 1506, in the past 400 years, Hainan has recorded a total of 8 snowfalls.
For example, in 1683, there was rain and snow in Wenchang, Hainan. The local chronicles record as follows:
In the 22nd year of Emperor Kangxi in Qing Dynasty, Wenchang , the winter was severely cold, rain and snow, marine fish froze to death, and coconut palms died out.
The snow in Hainan may seem unbelievable, but it is reasonable to consider it in a large climatic environment. Around the beginning of the 15th century, the global climate entered a cold period. This is what we often call the "little ice age". The "Little Ice Age" lasted until the beginning of the 20th century, spanning multiple dynasties longitudinally.
During this period of Little Ice,We often take the Ming Dynasty as an example. After the middle of in the Ming Dynasty, the temperature dropped further. There were weather records such as "Cold Summer" and "Snow Frost" in North China, and large areas of snowfall occurred in the South of the Yangtze River.
The glacial period encountered by the Ming Dynasty was extremely cold, especially during the 60 years at the end of the Ming Dynasty. Some people say that this was the coldest period in a thousand years for mankind.
The northern grassland is the most affected by the cold weather. If the frozen soil on the grassland increases, the water vapor will decrease, which will affect the rainfall. Less rainfall makes it more difficult for plants to grow and survive. With less vegetation, frozen soil will form again, leading to a decrease in rainfall.
This is a vicious circle of ecology. The grassland area has decreased and the number of cattle and sheep has decreased. Due to the pressure of survival, the nomads in the north will go south in search of living space. It was in this situation that the Qing army entered the Pass and destroyed the Ming Dynasty.
For the Ming Dynasty, colder weather would also cause droughts to intensify. Chongzhen , from 1628-1644, the Ming Dynasty experienced a rare ten-year drought, the lake gradually dried up, and even the main stream and tributaries of the Yellow River were cut off.
Historically, droughts are not a single disaster. Drought provides a breeding ground for locusts to incubate their eggs. Along with the drought, the locust plague also came from this. After the locust plague, agricultural production was reduced, the plague raged, food in people's mouths became less and less, and the whole society became unstable. These are all accumulating the power of the outbreak of the peasant uprising in the late Ming Dynasty.
The Ming Dynasty was greatly affected by the ice age, but the temperature was not very intuitive.The above picture shows that from the late Southern Song Dynasty to 1644 AD, that is, during the period from the end of the Ming Dynasty, the temperature only dropped by about 1 degree.
1 degree will destroy Daming. This fully says that small changes in temperature can cause unexpected changes.
Climate is never a linear corresponding to temperature . Since the 20th century, the global average temperature has risen by 0.6°C, and the thawing period of snow and ice in the northern hemisphere in spring is nine days earlier than 150 years ago. If the global temperature rises by 1°C, there will be no ice and snow on the African continent, and polar bear will disappear from the northern end of the earth; if it rises by 6°C, humans will disappear from the earth.
This is very scary.
Regarding climate, people still cannot grasp its inner logic. In the face of the climate, human beings are still small. A small change of a few degrees is an imperceptible acceleration of the heartbeat for the earth, but for us it may be a major historical event that determines life and death.
To treat the earth well is to treat yourself well, and to save the earth is to save our future.
The picture is from the Internet, invaded and deleted!
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