During the Little Ice Age of Ming and Qing Dynasties, the weather in Europe was cold in winter.
Great fluctuations are on the scale of hundreds of thousands to tens of thousands of years. According to the current technology, it is impossible for human beings to accurately predict what will happen hundreds of years later, let alone hundreds of thousands of years later.
We are now in the Quaternary Ice Age. If you want to enter the ice age, it is now an ice age, but why not be cold? Because the current climate is in the interglacial period.
Since the formation of the earth, * * * has experienced five major ice ages, namely Neoarchean Ice Age (2.4 billion to 2,654.38 billion years ago), Precambrian Ice Age (850 million to 630 million years ago), Early Paleozoic Ice Age (460 million to 430 million years ago) and Late Paleozoic Ice Age (360 million to.
The Great Ice Age lasted for thousands and hundreds of millions of years, and the Quaternary Ice Age lasted for more than 2 million years. Therefore, according to the development of the previous ice age, the earth was in the Quaternary Ice Age for hundreds to thousands of years.
Dinosaurs lived from 230 million years ago to 65 million years ago, just in the middle of the Late Paleozoic Great Ice Age and the Quaternary Great Ice Age. At that time, the climate on the earth was very warm and humid, much warmer than now. In this sense, even if dinosaurs were not extinct, it would be difficult to survive on today's earth, because the temperature is much lower now than when dinosaurs lived, and dinosaurs can only survive near the equator or in tropical areas today. At present, there are a large number of ice sheets in the Antarctic on the earth.
The Great Ice Age was alternated by several ice ages and interglacial periods. Although the earth was in the Quaternary Great Glaciation, it was in the interglacial period after the Quaternary Great Glaciation. So the current climate can be defined as neither too hot nor too cold, neither as warm and humid as in Jurassic period, nor as cold and dry as in Ice Age.
The interglacial period we are in now started from 6,543.8+200,000 years ago, and the interglacial period and glacial period of the Quaternary Great Ice Age existed on the scales of 1 10,000 years and110,000 years, such as the interglacial period from 6,543.8+200,000 years ago to the present, 6,543.8+0.65438+200,000 years. The ice age existed for a long time, and the interglacial period existed for a short time. The latest interglacial period lasted 20,000 years, and the latest one lasted 900 to 654.38 million+years. Our present interglacial period has existed for 65438+200,000 years. If it is to end, it will be at least a thousand years later, and it is unlikely to end for hundreds of years and decades. Therefore, it is too early to say that the earth has entered an ice age, let alone an ice age.
We can only roughly calculate the arrival time of the next ice age and ice age on the earth according to the past ice age and its existence time. According to the previous history, it is impossible to end the Quaternary Ice Age, because the Quaternary Ice Age only existed for more than 2 million years, and the interglacial period we are now in cannot end in hundreds or decades, because it only existed for 6.5438+0.2 million years after all. earth
So we can't judge whether the earth will enter an ice age by weather phenomena and climate events in a few years. Ice age is the scale of thousands of years, and the scale of ice age and interglacial period within ice age is the scale of ten thousand years. The data of several years and decades cannot predict the changes in tens of thousands or even hundreds of millions of years.
As early as the Republic of China, Nanjing, Wuhan and Chongqing, three cities in the Yangtze River valley of China, were called "three furnaces". Therefore, when the stove is ignited and extinguished, it is not necessarily related to whether the climate becomes cold or hot, but the location of the subtropical high. First of all, we should define the concepts of "bloom" and "Luo".
Every year in June of the lunar calendar, there will be high temperature weather in the Yangtze River basin in China, commonly known as "dog days". The hot and dry weather in this period is often called "summer drought", and before the "summer drought", it will experience a period of rainy weather. When does plum blossom? When will it enter the ambush? In the era when there was no weather forecast, people in China calculated according to the calendar and solar terms.
The dog days are the first, middle and last days, and it is the third Geng day after the summer solstice. Why is it on the third Geng day instead of a day in June? Because the lunar calendar in China is a combination of yin and yang, we should consider both the movement of the moon and the movement of the sun. It is not a pure solar calendar. When flowers bloom and when flowers fall are all related to the movement of the sun. So the date must be determined according to the solar calendar method, which is called the calendar composed of 10 heavenly stems and 12 earthly branches.