Whether global climate change is related to the change of magnetic field!

Since the birth of the earth, the temperature on the earth has experienced a cycle of warm period and ice period every tens of thousands of years or so. According to geological data, it happened more than 30 times in 800,000 years. Between the two ice ages, the temperature of the earth is warmer, which is called interglacial period. Therefore, the earth's climate changes gradually at a slow speed, and it is not static. The names of the four most famous ice ages are listed as follows: Poyang Ice Age 500,000 years ago137-105-65438+Dagu Ice Age 200,000 years ago100-320,000 years ago/Lushan Ice Age 0/00-320,000 years ago. Because a lot of sea water freezes, the sea level will shrink and the land area will expand. At the same time, tropical and subtropical regions will also shrink. The earth's climate repeats the cycle of ice age and warm period. The cold ice period lasts about 654.38+ ten thousand years, and then there will be a warm ice period of 654.38+ ten thousand years. At present, the earth is in a warm period, which has lasted for about10.5 million years. The biggest difference between the warm period of this stage and before is that it is currently in a jumping period of hot and cold. Therefore, scientists believe that according to the nonlinear law of jumping and the results of computer simulation, there is no reason for human beings to ignore the warning that the world may suddenly become cold. Europe may be the first area on earth to get cold. Since the birth of the earth, the temperature on the earth has experienced a cycle of warm period and ice period every tens of thousands of years or so. According to geological data, it happened more than 30 times in 800,000 years. Between the two ice ages, the temperature of the earth is warmer, which is called interglacial period. Therefore, the earth's climate changes gradually at a slow speed, and it is not static. The names of the four most famous ice ages are listed as follows: Poyang Ice Age 500,000 years ago137-105-65438+Dagu Ice Age 200,000 years ago100-320,000 years ago/Lushan Ice Age 0/00-320,000 years ago. Because a lot of sea water freezes, the sea level will shrink and the land area will expand. At the same time, tropical and subtropical regions will also shrink. The earth's climate repeats the cycle of ice age and warm period. The cold ice period lasts about 654.38+ ten thousand years, and then there will be a warm ice period of 654.38+ ten thousand years. At present, the earth is in a warm period, which has lasted for about10.5 million years. The biggest difference between the warm period of this stage and before is that it is currently in a jumping period of hot and cold. Therefore, scientists believe that according to the nonlinear law of jumping and the results of computer simulation, there is no reason for human beings to ignore the warning that the world may suddenly become cold. Europe may be the first area on earth to get cold. The ice age, also known as the ice age, refers to the fact that in some years, the land and sea of the earth were covered with ice, and these frozen areas were much wider than the current frozen areas. During the ice age, ice covered most parts of the world, and the climate in these areas was very cold; There is a lot of ice in the ocean, and there is thick ice on the ground. At the same time, because more water is stored in the ice, the sea level is lower everywhere. In two geological periods called Precambrian (600 million years ago) and the end of Ordovician (about 450 million years ago), ice ages may have appeared several times. In today's Sahara desert, we can still see the remains of the Ordovician ice age-there are large scratches on the stones, which were left by ice passing by. Scientists have determined that there have been eight glacial periods and eight warm periods in the history of the earth. During the ice age, many places in Europe, North Asia and North America were covered with large areas of ice and snow, and the current ice sheets and ice sheets were left at that time. The movement of ice changed the land. Ice scraped away a large area of rocks, and the scraped stone chips piled up on the edge of the ice, which is moraine. The weather gets warmer, the ice melts, the ice layer narrows, the moraine remains on the ground, and the water flowing from the melted ice layer is taken to other places. Many new lakes and rivers have been formed in mountains and basins that were once covered with ice. In addition, some scientists predict that the next ice age of the earth will appear as early as 6.5438+0.5 million years later, provided that human activities have no serious impact on the earth during this period. Ice age refers to the period when a large area of land on the surface was covered by glaciers. In the past life history of the earth, ice ages have appeared repeatedly; At least 800,000 years ago, the earth had experienced more than 30 ice ages. How cold was the earth during the ice age? In fact, it sounds a bit surprising. During the ice age, the temperature may have dropped by only four or five degrees Celsius in 100,000 years. But note ~ this is only a global "average" figure. With the arrival of the ice age, the polar ice sheet will expand and the distribution of subtropical areas will move to the equator. In some areas, such as coastal areas, due to the regulation of the ocean, or the equatorial region with strong sunshine all the year round, the temperature change may be small; However, in some areas, such as inland, desert areas or other areas with special topography and environment, the temperature drop is very obvious. Can living things survive? The temperature drop has changed the flora on the earth's surface, and indirectly or directly changed the living environment of animals, making many animals face extinction or forced migration. Of course, species that can adapt to the changed environment will survive. When was the last time? When the ice age came, the temperature gradually decreased. The last ice age occurred about 18000 years ago. According to the research results of scientists, the climate was cold at that time, and about one third of the world's land was covered with 240 meters thick ice. The earth has an ice age. Is there a "Jehol Age"? Between the end of the glacial period and the next glacial period, it is the "interglacial period"; The interglacial climate was warm, just like the earth is in the interglacial period now. Apart from the glacial and interglacial periods, there is no third hot period with particularly high temperature. The ice in the ice age was not directly frozen in the ocean, but the glaciers on the land expanded, and a large amount of ice remained on the land, which was not easy to return to the ocean, and the marine water body decreased. As a result, the sea level has dropped. The world's four major ice ages (ice ages) Names of foreign ice ages China Ice Age Date (ten thousand years) Geological age Gunis Ice Age Poyang Ice Age 137- 150 M Ice Age Late Jurassic 105- 150. Glacial period Lushan Glacier Period 10-32 Tertiary Oligocene Umm Glacier Period Dali Glacier Period1-1Quaternary Pleistocene has a change period of 400,000 years, but it has never been observed. So geophysicists and meteorologists think that the cosmic ray theory of Kirkeby and others is controversial, but it is not too crazy. It is worth studying whether the ice age was caused by the change of the total number of cosmic rays that attacked the earth. According to research, the influence of cosmic rays is acting on clouds, which in turn leads to great changes in the earth's climate. The change of beryllium-10 content in deep-sea sediments is studied. When cosmic rays hit air molecules in the earth's atmosphere, they will produce beryllium-10, so the cosmic ray flux can be inferred from the beryllium-10 content. They believe that these data show that cosmic ray flux seems to be related to the cycle of the ice age. The more cosmic ray flux, the more cloud cover and the colder the climate. On the contrary, when the cosmic ray flux is small, the cloud cover is also small, so the climate is warming. At first, these scientists thought that when the intensity of the solar wind (the charged particle stream emitted by the sun) changed, it would lead to the change of cosmic ray flux. In addition to the intensity change of solar wind (the influence scale is 10 ~ 1000), two new mechanisms that may lead to the change of cosmic ray flux are added: one is the change of the earth's magnetic field (the influence scale is1000 ~10000), and the other is particles from outside the solar system. This change is also shown in the 220,000-year beryllium-10 data of Kirkeby et al., and stalagmites found in northern Oman in Arabian Peninsula and Austrian Alps in Europe also confirm that this situation does exist. The upper left picture shows the change of beryllium-10 content in deep-sea sediments in the past 220 thousand years (red line, that is, the change of cosmic ray flux GCR) Blue represents the global average temperature, the area above the line indicates that the climate is warmer than it is now, and the area below the line indicates that it is colder than it is now. The left picture shows the geomagnetic changes measured in various ways, and the red line is still Beryllium-10, showing a fairly consistent trend. At present, the accepted standard "solar radiation model of ice age cycle" was put forward by Serbian astrophysicist Milutin Milankovi in 19 12. The ice age was caused by the change of the amount of sunlight reaching the earth, and the main reason for the change of the amount of sunlight was the periodic and gentle change of the orbit shape of the earth around the sun. However, although the solar exposure theory can explain the prehistoric climate change cycle of about 465,438+0,000 years, it cannot explain the observed climate change cycle of 6,543,800+10,000 years. In addition, this theory also predicted the change period of 400,000 years, but it has never been observed.