Is global climate change related to magnetic field changes?

Since the birth of the earth, every tens of thousands of years or so, the temperature on the earth has experienced a cycle of warm periods and ice ages. According to geological data, it occurred more than 30 times within 800,000 years. Between two ice ages, the Earth's temperatures were warmer, called interglacial periods. Therefore, the earth's climate changes gradually at a slow rate and is not static. Among them, the most famous are the four longer glaciations, whose names are listed below: Poyang Ice Age 1.37-1.5 million years ago Dagu Ice Age 1.05-1.2 million years ago Lushan Ice Age 100,000-320,000 years ago Dali Ice Age 10,000-110,000 years ago When the ice age came years ago, it would cause global temperatures to drop. During each ice age, the temperature in Antarctica would drop by about 11 degrees Celsius compared to the current temperature. As a large amount of seawater freezes, the sea level shrinks and the land area expands. At the same time, the area of ​​the tropics and subtropics will also shrink. The earth's climate constantly repeats the cycle of ice ages and warm periods. The cold ice age lasts about 100,000 years, followed by a warm period of 10,000 years. The Earth is currently in a warm period, which has lasted for approximately 15,000 years. The biggest difference between the current warm period and the previous one is that it is currently in a jumping period of hot and cold periods. Therefore, scientists believe that based on the analysis of the nonlinear rules of jumps and the results of computer simulations, there is no reason for humans to ignore the warning that the world may suddenly cool. Europe may be the first place on earth to get colder. Since the birth of the earth, every tens of thousands of years or so, the temperature on the earth has experienced a cycle of warm periods and ice ages. According to geological data, it occurred more than 30 times within 800,000 years. Between two ice ages, the Earth's temperatures were warmer, called interglacial periods. Therefore, the earth's climate changes gradually at a slow rate and is not static. Among them, the most famous are the four longer glaciations, whose names are listed below: Poyang Ice Age 1.37-1.5 million years ago Dagu Ice Age 1.05-1.2 million years ago Lushan Ice Age 100,000-320,000 years ago Dali Ice Age 10,000-110,000 years ago When the ice age came years ago, it would cause global temperatures to drop. During each ice age, the temperature in Antarctica would drop by about 11 degrees Celsius compared to the current temperature. As a large amount of seawater freezes, the sea level shrinks and the land area expands. At the same time, the area of ​​the tropics and subtropics will also shrink. The Earth's climate constantly repeats the cycle of ice ages and warm periods. The cold ice age lasts about 100,000 years, followed by a warm period of 10,000 years. The Earth is currently in a warm period, which has lasted for approximately 15,000 years. The biggest difference between the current warm period and the previous one is that it is currently in a jumping period of hot and cold periods. Therefore, scientists believe that based on analysis based on the nonlinear rules of jumps and computer simulation results, there is no reason for humans to ignore the warning that the world may suddenly cool. Europe may be the first place on earth to get colder. Ice Age, also known as the Ice Age, refers to the period when the earth's land and oceans were covered by ice. These ice-covered areas were much wider than the areas covered by ice now. During the Ice Age, ice covered large areas of the world, and the climate in these areas was very cold; there were a lot of ice in the oceans, and thick ice condensed on the ground. At the same time, because more water is stored in the ice, sea levels are lower everywhere. Ice ages may have occurred several times during two geological periods called the end of the Precambrian (600 million years ago) and the Ordovician (about 450 million years ago). We can still see remnants of the Ordovician Ice Age in today's Sahara Desert - there are scratch marks on the stones in large areas, which were left by the passage of ice. Scientists believe that there have been 8 ice ages and 8 warm periods in the history of the earth. During the Ice Age, many places in Europe, northern Asia, and North America were covered with large amounts of ice and snow, and the current ice caps and ice layers are what is left of that time. The movement of the ice changes the landmass. The ice scrapes away large areas of rock, and the scraped stone debris accumulates on the edge of the ice, called moraine. When the weather is warmer, the ice and snow melt and the ice layer shrinks, leaving the moraine on the ground, and the water flowing down from the melting ice layer is carried to other places. Many new lakes and rivers have formed in mountains and basins that were once covered by ice. In addition, some scientists predict that the next ice age of the earth will occur as early as 15,000 years ago, provided that human activities do not have a serious impact on the earth during this period. An ice age refers to a period when a large area of ​​land on the earth's surface was covered by glaciers. In the past history of life on earth, ice ages have appeared repeatedly; at least 800,000 years ago, the earth has experienced more than 30 ice ages. How cold was the Earth's ice age? It actually sounds a bit surprising. During the Ice Age, the temperature may only have dropped by 4 or 5 degrees Celsius within 100,000 years. But please note that this is just a global "average" number. During the Ice Age, the polar ice caps expand, and the distribution of subtropical regions moves toward the equator. In some areas, such as coastal areas, due to the regulation of the ocean, or equatorial areas with strong sunshine all year round, the temperature changes may be smaller; but in some areas, such as inland, desert areas or areas with other special terrain and environments, the temperature changes may be smaller. The decline is very obvious. Can living things survive? The drop in temperature has changed the vegetation on the surface, and has also indirectly or directly changed the living environment of animals, causing many animals to face extinction or be forced to migrate.

Of course, species that can adapt to the changed environment will survive. When was the last time? When an ice age comes, the temperature drops slowly and gradually. The last ice age occurred about 18,000 years ago. According to scientists' research, the climate at that time was cold, and about one-third of the world's land was covered under a 240-meter-thick ice layer. The earth has ice ages, is there a "hot period"? The period between the ice age and the next ice age is the "interglacial period"; the climate during the interglacial period is warm, and the earth is currently in an interglacial period. Apart from glacial ages and interglacial periods, there is no third hot period with particularly high temperatures. The ice in the ice age did not freeze directly in the ocean. Instead, the glaciers on land expanded. A large amount of ice stayed on the land and was not easy to return to the sea. The ocean water volume decreased and the sea level dropped. The four major ice ages in the world (Ice age) abroad Name of the Ice Age Name of the Ice Age in China Time of occurrence (10,000 years) Geological time Guniz Ice Age Poyang Ice Age 137-150 End of the Jurassic Mindel Ice Age Dagu Ice Age 105-120 Cretaceous Riss Ice Age Lushan Ice Age 10-32 Tertiary Oligocene Wurm Ice Age Dali Ice Age 1-11 The Quaternary Pleistocene has a 400,000-year change cycle, but it has never been observed. Therefore, geophysicists and meteorologists believe that although the cosmic ray theory of Kirkby and others is controversial, it is not too crazy and is worthy of careful study. Ice ages were caused by cosmic rays that hit the earth. rays) caused by changes in the total amount? According to research, the influence of cosmic rays acts on clouds, which then leads to dramatic changes in the earth's climate. The study looked at changes in the content of beryllium-10 in deep sea sediments. Beryllium-10 is produced when cosmic rays hit air molecules in the Earth's atmosphere. Therefore, the content of beryllium-10 can be inferred from the cosmic ray flux. They believe that these data show that cosmic ray flux seems to be related to the ice age cycle. When the cosmic ray flux is greater, the cloud cover seems to tend to increase, and the climate becomes cooler; conversely, when the cosmic ray flux is low, the cloud cover is also less, and the climate becomes warmer. Initially, these scientists believed that changes in the intensity of the solar wind (the flow of charged particles emitted by the sun) would lead to changes in the cosmic ray flux. In addition to changes in the intensity of the solar wind (the scale of influence is 10 to 1000 years), two new mechanisms are added that may cause changes in cosmic ray flux: one is changes in the Earth's magnetic field (the scale of influence is 100 to 10,000 years); Particle flow from outside the solar system (scale of influence is more than 10 million years). Among them, one of the changes in the earth's magnetic field is the orbital modulation of the geomagnetic mechanism. That is to say: the direction and intensity of the earth's magnetic field will undergo certain changes over time; this change has only recently been measured by the geomagnetic field. This change was found in the 220,000-year-old beryllium-10 data of Kirkby et al., and the stalagmites found in northern Oman on the Arabian Peninsula and the Alps in Austria in Europe also confirmed this change. The situation does exist. The picture above on the left shows the changes in beryllium-10 content in deep sea sediments (red line, which is the change in cosmic ray flux GCR) over time during 220,000 years. The blue horizontal line represents the current global average temperature, above the line The area below the line indicates that the climate is warmer than now, and the area below the line indicates that the climate is colder than now. The picture below on the left shows the geomagnetic changes measured by various methods. The red line is still the data of beryllium-10, which shows that there is a fairly consistent trend. The currently recognized standard "insolation model of glacial cycles" for the cause of glacial cycles was proposed by Serbian astrophysicist Milutin Milankovitch in 1912: Ice ages are caused by changes in the amount of sunlight reaching the earth. The main cause of changes in the amount of sunlight is the periodic and gentle changes in the shape of the Earth's orbit around the sun. However, although the insolation theory can explain the prehistoric climate change cycle of about 41,000 years, it cannot explain the currently observed 100,000-year climate change cycle; in addition, this theory also predicts a 400,000-year change cycle, but it has not observed.