More and more greenhouse gases, such as nitrogen and ozone, have caused changes in atmospheric composition.
2) depletion and destruction of the ozone layer
Impact:
1) the increase of pests and diseases on the earth;
2) sea level rise;
3) Abnormal climate, increasing ocean storms;
4) The land is dry and the desertification area increases.
Detailed introduction
Name: greenhouse effect
English: the greenhouse effect
From the definition of greenhouse effect in IPCC glossary.
The greenhouse effect, also known as the "greenhouse effect", is a common name for the atmospheric heat preservation effect. The atmosphere can make the short-wave radiation of the sun reach the ground, but the long-wave radiation emitted by the ground is absorbed by the atmosphere, which raises the temperature of the ground and the lower atmosphere. Because its function is similar to the greenhouse for cultivating crops, it is named the greenhouse effect. If this effect does not exist in the atmosphere, the surface temperature will drop by about 3 degrees or more. On the other hand, if the greenhouse effect continues to strengthen, the global temperature will continue to rise year by year. Since the industrial revolution, carbon dioxide and other heat-absorbing greenhouse gases emitted into the atmosphere by human beings have increased year by year, and the greenhouse effect of the atmosphere has also been enhanced, which has caused a series of serious problems such as global warming and attracted the attention of all countries in the world.
The greenhouse effect caused by environmental pollution refers to the phenomenon that the earth's surface becomes hot.
How is the greenhouse effect produced? What can we do?
The greenhouse effect is mainly caused by excessive burning of coal, oil and natural gas in modern industrial society, which releases a lot of carbon dioxide gas into the atmosphere after burning.
Carbon dioxide gas has the functions of heat absorption and heat insulation. The result of its increase in the atmosphere is the formation of an invisible glass cover, which prevents the heat radiated by the sun to the earth from spreading to outer space, and as a result, the surface of the earth becomes hot. Therefore, carbon dioxide is also called greenhouse gas.
Greenhouse gases effectively absorb infrared radiation emitted by the same gases and clouds on the earth's surface and the atmosphere itself. Atmospheric radiation is emitted in all directions, including to the surface of the earth below. Greenhouse gases absorb heat in the ground-troposphere system. This is called "natural greenhouse effect". Atmospheric radiation is closely related to the temperature level of its gas emission. In the troposphere, the temperature generally decreases with the increase of altitude. Infrared radiation emitted into space from a certain height is generally generated at a height with an average temperature of-19℃, and the temperature of the earth's surface can be kept at an average temperature of 1 4℃ due to the income balance of solar radiation. The increase of greenhouse gas concentration leads to the enhancement of atmospheric opacity to infrared radiation, which leads to the emission of effective radiation into space from lower temperature and higher altitude. This creates radiation forcing, and this imbalance can only be compensated by the temperature rise of the ground troposphere system. This is the "enhanced greenhouse effect".
[Edit this paragraph] Source
The greenhouse effect is mainly caused by the excessive burning of coal, oil and natural gas in modern industrial society, which releases a lot of carbon dioxide gas into the atmosphere after burning.
Carbon dioxide gas has the functions of heat absorption and heat insulation. The result of its increase in the atmosphere is the formation of an invisible glass cover, which prevents the heat radiated by the sun to the earth from spreading to outer space, and as a result, the surface of the earth becomes hot. Therefore, carbon dioxide is also called greenhouse gas.
Human activities and nature also emit other greenhouse gases, such as chlorofluorocarbons (CFCs), methane, low-level ozone and nitrogen oxides. On earth, plankton in the ocean and forests on land, especially tropical rainforests, can absorb a lot of carbon dioxide.
In order to reduce the excessive carbon dioxide in the atmosphere, on the one hand, people need to save electricity as much as possible (because power generation needs to burn coal) and drive less cars. On the other hand, protect forests and oceans, for example, don't cut down forests and prevent the oceans from being polluted, so as to protect the survival of plankton. We can also protect green plants by planting trees, reducing the use of disposable wooden chopsticks, saving paper (paper wood) and not trampling on the lawn, so that they can absorb more carbon dioxide to help slow down the greenhouse effect.
New theory
Since 1975, the average temperature of the earth's surface has increased by 0.9 degrees Fahrenheit, and global warming caused by greenhouse effect has become the focus of world attention. Academics have always recognized that carbon dioxide produced by the burning of coal, oil and natural gas is the chief culprit of global warming. However, after decades of observation and research, Dr. james hanson from Goddard Institute of Space Studies in the United States put forward a new view that greenhouse gases are mainly carbon dust and other substances, not carbon dioxide.
Carbon particle dust is a kind of solid particulate matter, which is mainly caused by the low carbon utilization rate when burning high-carbon fuels such as coal and diesel. It not only wastes resources, but also causes environmental pollution. A large number of carbon particles gather in the troposphere, which leads to the accumulation of clouds, and the accumulation of clouds is the beginning of the greenhouse effect, because 40% to 90% of the ground heat comes from the atmospheric reverse radiation generated by clouds. The thicker the clouds, the less heat will spread out, and the hotter the earth will be.
Dr. Hansen recorded the changes in the contents of various greenhouse gases, and found that the content of carbon dioxide nearly tripled between 1950 and 1970, but decreased from 1970s to the end of 1990s. It is difficult to explain the worsening global warming phenomenon with the current popular theory.
Dr. Hansen believes that in addition to carbon dust, there are other gaseous substances that can cause the greenhouse effect, such as ozone in the troposphere (normal ozone should be concentrated in the stratosphere), methane and highly toxic chlorofluorocarbons. However, the control of these pollution sources is relatively difficult. Fortunately, the content of non-carbon dioxide greenhouse gases has decreased in recent decades. If the contents of methane and ozone in the troposphere can also be reduced year by year, the change of the average temperature on the earth's surface will be almost zero in 50 years!
Carbon dust is not inevitable. With the continuous improvement of the quality of internal combustion engine, even the appearance of vehicles without internal combustion engine can reduce the residual carbon particles. If Dr. Hansen's theory can be established, it will bring new hope for the earth to cool down and hope that the earth will have a fever as soon as possible.
Before the industrial revolution, the content of carbon dioxide in the atmosphere was 280ppm. According to the current growth rate, by 2 100, the content of carbon dioxide will increase to 550ppm, that is, it will almost double. Many meteorologists all over the world are trying to study how much the global average temperature will rise by 2 100 after the carbon dioxide content doubles.
At present, the concrete method is to design a numerical model to calculate according to the laws of atmospheric movement and physical state change. However, due to people's imperfect understanding of the law of atmospheric motion change, the calculation results of each model are often very different by using different simplified calculation methods. Therefore, in the 1980s, the American Academy of Sciences organized an evaluation committee to study and comprehensively evaluate the results of these models, and finally came to the conclusion that the global average temperature would increase by 3℃ after CO2 doubling, that is, 1.5℃, that is, 1.5℃-4.5℃. This is the figure used in the first report of the United Nations Intergovernmental Panel on Climate Change, the most authoritative organization on this issue.
In recent years, the simulation ability of climate model has been greatly improved, mainly considering the role of aerosols (tiny particles suspended in the air) in the atmosphere. Because when burning fossil fuels, it will release CO2, and at the same time, it will release huge aerosols such as sulfides. This aerosol will prevent some sunlight from reaching the ground, thus reducing the ground temperature and playing a role in cooling down. The IPCC estimated it to be -0.5 W/m2. That is, 1/3 is equivalent to the warming effect of CO2 (1.56W/m2), which is slightly greater than that of methane (+0.47W/m2). Mainly based on this improvement, in the second report published in 1996, IPCC changed the warming value of global average temperature after CO2 doubling of 2 100 from 1.5℃-4.5℃ to 1.0℃-3.5℃. The assessment report also pointed out that due to the huge thermal inertia of the ocean, the warming value of 2 100 will only be about 50%-90%.
However, the results of model calculation also show that the global average warming 1.0℃-3.5℃ is unevenly distributed around the world, but there is no or almost no warming in equatorial and tropical areas, and the warming is mainly concentrated in high latitudes, with the amount reaching 6℃-8℃ or even more. This will cause another serious consequence, that is, the ice sheets at the poles and Greenland will melt, causing sea levels to rise. The permafrost zone of the high-latitude continent in the northern hemisphere will also melt or thin, resulting in a large area of swamp. In addition, the volume expansion of seawater after ocean warming will also lead to sea level rise. In the first assessment report of IPCC, it is predicted that the sea level will rise by 70- 150 cm (corresponding temperature rise 1.5℃-4.5℃), and in the second assessment report, it will be 20% lower than the first assessment result (corresponding temperature rise 1.0℃-3.5℃). The IPCC's second assessment report also pointed out that the global sea level has risen by10-25cm since the end of 19, because the global average temperature has risen by 0.3℃-0.6℃.
The rise of global sea level will directly flood the coastal lowlands with dense population and developed industry and agriculture, with very serious consequences. 1995165438+1At the second Conference of the Parties to the United Nations Framework Convention on Climate Change held in Berlin in October, 44 small island countries formed the Alliance of Small Island States and called for the right to exist.
In addition, it is pointed out that the increase of CO2 will not only lead to global warming, but also lead to the adjustment of global atmospheric circulation and the expansion of climatic zones to the polar regions. The precipitation in mid-latitude areas, including northern China, will decrease, and evaporation will increase as the temperature rises, so the climate will become drier. The adjustment of atmospheric circulation, in addition to mid-latitude drought, may also cause climate anomalies and disasters in other parts of the world. For example, the intensity of typhoons at low latitudes will increase, and the source of typhoons will expand northward. Rising temperature will also cause and aggravate the epidemic of infectious diseases. Take malaria as an example. In the past five years, the incidence of malaria in the world has quadrupled. At present, about 500 million people in the world suffer from malaria every year, and more than 2 million of them die.
However, the greenhouse effect is not all bad. Because the coldest high latitudes have the greatest warming, agricultural areas will be greatly promoted to the polar regions. The increase of CO2 is also beneficial to the photosynthesis of plants and directly increases the yield of organic matter. It is also pointed out that in the historical period of China and the world, the warm period is mostly a prosperous period with more precipitation and shrinking arid areas, and so on.
Of course, there are also different views on the issue of atmospheric greenhouse effect. For example, some scientists used to think that the current numerical model is immature and the calculation results are too exaggerated; A rise of 0.3℃-0.6℃ in a hundred years is a normal climate change, which cannot be proved to be caused by the atmospheric greenhouse effect, and so on. Of course, this is a minority opinion.
However, the indisputable fact is that the concentration of CO2 in the atmosphere and the global temperature are increasing rapidly, and the increase of greenhouse gases will lead to global warming. If we wait until the problem is clearly perceived by human beings, it will often be difficult to reverse it, and it will be too late. Therefore, we must attach great importance to it now in order to take countermeasures to protect the atmospheric environment on which human beings depend.
[Edit this paragraph] Introduction
Brief Diagram of Greenhouse Effect Greenhouse effect refers to the heat preservation effect caused by the lack of heat exchange between the enclosed space transmitting sunlight and the outside world, that is, the short-wave radiation of the sun can penetrate into the ground through the atmosphere, and the long-wave radiation released after the ground warms is absorbed by substances such as carbon dioxide in the atmosphere, thus producing the effect of atmospheric warming. Carbon dioxide in the atmosphere is like a thick layer of glass, which makes the earth a big greenhouse. It is estimated that if there is no atmosphere, the average surface temperature will drop to -23℃, while the actual average surface temperature is 15℃, which means that the greenhouse effect will increase the surface temperature by 38℃.
The atmosphere can make the short-wave radiation of the sun reach the ground, but the long-wave radiation released by the ground and the carbon dioxide produced by natural gas combustion far exceed the previous level. On the other hand, due to deforestation, a large number of farmland has been built into cities and factories, destroying vegetation and reducing the conditions for converting carbon dioxide into organic matter. In addition, the surface water area is gradually shrinking, the precipitation is greatly reduced, the conditions for absorbing and dissolving carbon dioxide are reduced, the dynamic balance of carbon dioxide generation and transformation is destroyed, and the carbon dioxide content in the atmosphere is increased year by year. The increase of carbon dioxide content in the air changed the temperature of the earth. However, some optimistic scientists claim that the carbon dioxide emitted by human activities is far less than that released by geological activities such as volcanoes. They believe that there have been frequent earth activities recently, such as the successive eruptions of Krakatoa volcano and San hellens volcano. The earth is releasing carbon dioxide from its abdomen. So the greenhouse effect is not entirely human's fault. This view has some truth, but it can't explain the soaring carbon dioxide content after the industrial revolution. Are they all from volcanoes?
In the air, nitrogen and oxygen account for the highest proportion, and both of them can transmit visible light and infrared radiation. But carbon dioxide can't. It cannot penetrate infrared radiation. Therefore, carbon dioxide can prevent the surface heat from radiating into space and has the function of regulating the earth's temperature. Without carbon dioxide, the average annual temperature of the earth would be 20℃ lower than it is now. But if the carbon dioxide content is too high, it will make the earth seem to be in a pot, and the temperature will gradually rise, forming a "greenhouse effect." Besides carbon dioxide, there are other gases that can also cause the greenhouse effect. Among them, carbon dioxide accounts for about 75%, chlorofluoroalkanes account for about 15% ~ 20%, and there are more than 30 kinds of methane and nitric oxide.
If the carbon dioxide content doubles, the global temperature will increase by 3℃ ~ 5℃, and the polar regions may increase by 10℃, and the climate will be obviously warmer. Rising temperature will lead to increased rainfall in some areas, drought in some areas, increased intensity and frequency of hurricanes and intensified natural disasters. What is even more worrying is that due to the rising temperature, glaciers in polar regions will melt and sea levels will rise, and many coastal cities, islands or low-lying areas will face the threat of rising sea water or even be swallowed up by sea water. In the late 1960s, a drought lasted for six years in the pastoral areas of sub-Saharan Africa. Due to lack of food and pasture, livestock were slaughtered, and more than 6.5438+0.5 million people died of hunger.
This is a typical example of the "greenhouse effect" bringing disaster to mankind. Therefore, we must effectively control the increase of carbon dioxide content, control population growth, use fuel scientifically, strengthen afforestation, green the earth, and prevent global disasters caused by the greenhouse effect.
Scientists predict that the global average temperature will rise by 1 times for every increase of carbon dioxide in the atmosphere in the future, and the temperature increase in polar regions will be about three times higher than the average. Therefore, rising temperatures will inevitably melt polar ice, leading to rising sea levels. Sea level rise has a very serious impact on human society. If the sea level rises 1 m, the land directly affected is about 5× 106 km2, the population is about 1 billion, and the cultivated land accounts for about 1/3 of the total cultivated land area in the world. If extreme storm surge and salt water intrusion are taken into account, the coastal areas below 5 meters above sea level will be affected, and the population and grain output of these areas account for about 1/2 of the world. Some coastal cities may move inland, and most coastal plains will be salinized or swamped, which is not suitable for grain production. At the same time, it will also cause disasters to the middle and lower reaches of the river. Seawater intrusion will cause the river water level to rise, sediment deposition to accelerate, flood threat to intensify, and the downstream environment of the river to deteriorate sharply. The greenhouse effect and global warming have attracted worldwide attention. At present, the international convention on climate change is being promoted, and reducing carbon dioxide emissions has become the general trend.
Scientists predict that if I start cutting trees moderately now, global warming will be reduced by 5% by 2050.
[Edit this paragraph] function
Greenhouse has two characteristics: the temperature is higher than that outside, and it does not dissipate heat. Glass greenhouses and vegetable greenhouses that can be seen in life are typical greenhouses. Glass or transparent plastic film is used as a greenhouse, so that sunlight can directly shine into the greenhouse and heat the indoor air, and the glass or transparent plastic film can prevent the indoor hot air from emitting outward, thus keeping the indoor temperature higher than the outside and providing conditions conducive to the rapid growth of plants.
[Edit this paragraph] Consequences
Environmental effect
Climate Change: "Global Warming"
The increase of greenhouse gas concentration will reduce infrared radiation to outer space, so the earth's climate needs to be changed to achieve a new balance between absorbing and releasing radiation. This transformation may include "global" warming of the earth's surface and lower atmosphere, because it will release excessive radiation. However, a slight increase in the earth's surface temperature may trigger other changes, such as changes in atmospheric cloud cover and circulation. Some of these changes will aggravate the ground warming (positive feedback), while others will slow down the warming process (negative feedback).
Using a complex climate model, the Intergovernmental Panel on Climate Change estimated in its third assessment report that the global average surface temperature will rise by 65,438+0.4 to 5.8 degrees in 265,438+000. This is expected to take into account the role of suspended particles in the atmosphere in the cooling of the earth's climate and the role of the ocean in absorbing heat energy (the ocean has a large heat capacity). However, there are still many uncertain factors that will affect this calculation result, such as the prediction of future greenhouse gas emissions, various feedback processes to climate change and the degree of ocean heat absorption.
2) The increase of pests and diseases on the earth.
The greenhouse effect will make prehistoric deadly viruses threaten human beings.
American scientists have recently warned that due to the melting of Arctic ice due to global temperature rise, prehistoric deadly viruses frozen for more than100000 years may reappear, leading to global epidemic panic and seriously threatening human life.
Scientists at Syracuse University in New York pointed out in the latest issue of Scientist that they had discovered a plant virus TOMV earlier. Because it is widely spread in the atmosphere, it is inferred that this virus has also been found in the Arctic ice sheet. So the researchers extracted four pieces of ice from Greenland, ranging in age from 5 million years to 6.5438+0.4 million years, and found the TOMV virus in the ice. Researchers say that the surface of the virus is surrounded by a solid protein, so it can survive in adversity.
This new discovery makes researchers believe that a series of epidemic viruses such as influenza, polio and smallpox may be hidden deep in the ice. At present, human beings have no resistance to these primitive viruses. When the global temperature rises and the ice melts, these viruses buried in the ice for thousands of years or more may resurface and form an epidemic. Scientists say that although they don't know the survival hope of these viruses or the chance to adapt to the ground environment again, they certainly can't rule out the possibility of the virus coming back.
3) sea level rise
If "global warming" is happening, there are two processes that will lead to sea level rise. First of all, the seawater is heated and expanded, which makes the water level rise. The second is that the melting of glaciers and ice in Greenland and Antarctic continent has increased the water content of the ocean. It is predicted that from 1900 to 2 100, the average sea level of the earth will rise by 0.09-0.88m..
Global warming is about to reach its peak in the South Pacific islands.
Global warming leads to the rapid melting of the ice sheets in the North and South Poles and the rising sea level. According to a report of the World Bank, even a slight sea level rise of 1 m is enough to cause 56 million people in developing countries to become refugees. The world's first inhabited island submerged by seawater is about to be born-Katri Island, located in Papua New Guinea, a South Pacific country. Now the main roads on the island are waist deep, and all agricultural land has turned into mud.
4) The climate is abnormal, and ocean storms are increasing.
5) The land is dry and the desertification area increases.
Potential impact on human life
1) Economic impact
More than half of the world's population lives in the coastal area of 100 km, and most of them live in urban areas near seaports. Therefore, the significant rise of sea level will cause serious economic damage to coastal low-lying areas and islands, such as accelerating the erosion of coastal beaches by seawater and pushing underground fresh water farther inland through rising seawater.
2) The impact of agriculture
Experiments show that plants will grow faster and taller in the environment with high concentration of CO2. However, the result of "global warming" may affect the atmospheric circulation, and then change the global rainfall distribution and the water content of the surface soil on all continents. Due to the failure to clearly understand the impact of "global warming" on regional climate, the transformation of plant ecology has not yet been determined.
III) Impact of marine ecology
The disappearance of coastal marshes will definitely reduce the number of fish, especially shellfish. The salinity of estuary water quality may reduce the species of freshwater fish, on the contrary, the species of marine fish in this area may also increase relatively. As for the impact on the overall marine ecology, it is still unclear.
Iv) the influence of water cycle
Global rainfall may increase. However, the change of regional rainfall is still unknown. Some areas may have more rainfall, but some areas may have less rainfall. In addition, the increase of temperature will increase the evaporation of water and put pressure on the use of surface water sources.
Scientists predict that if the earth's surface temperature continues to rise at the current rate, by 2050, the global temperature will rise by 2-4 degrees Celsius, polar icebergs will melt greatly, resulting in a sharp rise in sea level, and some island countries and coastal cities will be submerged, including several famous international cities: new york, Shanghai, Tokyo and Sydney.
come to the point
Farmland waterlogging and malaria are rampant.
People in Catalina Island, dressed in traditional costumes, have always been happy in their life of knowing and doing, have been independent for hundreds of years, and have always maintained a traditional lifestyle. However, due to global warming caused by human destruction of the environment, they are facing the fate of being submerged by seawater. Paul Tabashi, an environmentalist on Katrina Island, said: "They were attacked by ocean forces and flooded constantly. The original area has been changed and destroyed, and almost all places have been submerged by seawater.
It is unbearable that mosquitoes and flies are swarming and malaria is rampant.
Experts predict that in a few years, Katri Island will be completely submerged in seawater, and it is imperative for the residents of the whole island to move to villages and evacuate.
The Amazon rainforest is disappearing.
The Amazon rainforest, the largest tropical rain forest in South America and even the world, is gradually disappearing, making the global warming crisis worse.
The Amazon rainforest, known as the lung of the earth, covers 5% of the earth's surface and produces 20% of oxygen and 30% of biological species in the world. Due to illegal logging and reclamation, the Amazon rainforest is disappearing at an area of 7,700 square miles per year, equivalent to the area of New Jersey. The disappearance of the rainforest will not only aggravate global warming, but also make many creatures that can only live in the rainforest face the crisis of extinction. In the past 40 years,
A new ice age is coming.
Another very serious consequence of global warming is the arrival of the ice age.
The melting of the Antarctic ice sheet has caused a large amount of fresh water to be injected into the ocean, and the concentration of seawater has decreased. As a result, the "ocean conveyor belt" gradually stopped: the warm current could not reach the cold sea; The cold current can't reach the warm sea. As the global temperature drops, another ice age is coming. Most parts of the northern hemisphere are frozen, and successive snowstorms and tornadoes will sweep across the mainland.
The ultimate harm: it may lead to the dinosaur era coming again!
[Edit this paragraph] New note
Since 1975, the average temperature of the earth's surface has increased by 0.9 degrees Fahrenheit, and global warming caused by greenhouse effect has become the focus of world attention. The academia has always recognized that carbon dioxide produced by the burning of coal, oil and natural gas is the chief culprit of global warming. However, after decades of observation and research, Dr. james hanson from Goddard Institute of Space Studies in the United States put forward a new view that greenhouse gases are mainly carbon dust and other substances, not carbon dioxide.
Carbon particle dust is a kind of solid particulate matter, which is mainly caused by the low carbon utilization rate when burning high-carbon fuels such as coal and diesel. It not only wastes resources, but also causes environmental pollution. A large number of carbon particles gather in the troposphere, which leads to the accumulation of clouds, and the accumulation of clouds is the beginning of the greenhouse effect, because 40% to 90% of the ground heat comes from the atmospheric reverse radiation generated by clouds. The thicker the clouds, the less heat will spread out, and the hotter the earth will be.
In fact, global change affects not only a few countries and regions, but also a global phenomenon. Global change not only brings climate change such as rainstorm, but also has a serious impact on species survival and human life. As far as East Asia is concerned, the uplift of the Cenozoic Qinghai-Tibet Plateau played an important role in the formation of the Arctic ice sheet, and also affected the atmospheric circulation in Asia. When the Qinghai-Tibet Plateau reached about half its present height, the embryonic form of the Asian monsoon appeared. However, recent research shows that the temperature on the Qinghai-Tibet Plateau is rising gradually, and the rising speed is faster than we thought. The direct consequence is that the frozen soil layer moves down, and the carbon dioxide and methane accumulated in glaciers and frozen soil (cryosphere) for many years are released in large quantities. In fact, what we commonly call greenhouse gas is not only carbon dioxide, but methane is also the chief culprit of global warming. It is predicted that the overall warming of the Qinghai-Tibet Plateau may weaken or change the Asian monsoon, which means that the precipitation, temperature and humidity in China and even the whole East Asia will change, thus affecting agricultural production and population life.
In addition, global change also seriously affects the distribution and adaptation of organisms. A very important research direction in the international geosphere-biosphere plan is the interaction between geosphere and biosphere. The increase of carbon dioxide is actually a release of C fertilizer, which will directly lead to the change of vegetation distribution. At the same time, for temperature-sensitive wild animals, such as giant pandas, the altitude of their lives will gradually increase with the increase of temperature, which will lead to the gradual fragmentation of their living environment, which will make it difficult to complete mating and reproduction, and eventually lead to species extinction. Many species related to ecological balance face this situation. Therefore, it is not only the weather process such as flood in the south, drought in the north, freezing cold wave in rain and snow, but also its influence will be far-reaching.
There are many aspects in the study of global change, among which the main work focuses on the study of past global changes. Based on a series of studies on stalagmites, peat beds, paleosol and fossils in Bingxin (Yaotan Cave), the environmental climate change and its species response in Cenozoic era, especially in recent 2000 years, were analyzed. It is used to understand the formation mechanism of global change, its impact on ecosystem, its response and its impact on human beings, so as to analyze and judge the future trend of global change. Traditionally, marine oxygen isotopes are used to determine ancient sea level, ancient temperature and precipitation sequence. Recently, some people have analyzed the composition of organic matter in many samples by means of geo-biological methods (such as Xie Shucheng). In a word, the science of global change is not only a work in the field of geochemistry (such as the Global C Plan), but is developing in an interdisciplinary direction. Especially in today's global change research, we pay special attention to process research. Paleontology and geo-biology should explore more research methods and provide more information to reflect the content of global changes in the past.
Not to mention the influence of industrial society, natural factors:
In fact, global change affects not only a few countries and regions, but also a global phenomenon. Global change not only brings about climate change such as rainstorm, but also has a serious impact on species survival and human life. As far as East Asia is concerned, the uplift of the Cenozoic Qinghai-Tibet Plateau played an important role in the formation of the Arctic ice sheet, and also affected the atmospheric circulation in Asia. When the Qinghai-Tibet Plateau reached about half its present height, the embryonic form of the Asian monsoon appeared. However, recent research shows that the temperature on the Qinghai-Tibet Plateau is rising gradually, and the rising speed is faster than we thought. The direct consequence is that the frozen soil layer moves down, and the carbon dioxide and methane accumulated in glaciers and frozen soil (cryosphere) for many years are released in large quantities. In fact, what we commonly call greenhouse gas is not only carbon dioxide, but methane is also the chief culprit of global warming. It is predicted that the overall warming of the Qinghai-Tibet Plateau may weaken or change the Asian monsoon, which means that the precipitation, temperature and humidity in China and even the whole East Asia will change, thus affecting agricultural production and population life.
In addition, global change also seriously affects the distribution and adaptation of organisms. A very important research direction in the international geosphere-biosphere plan is the interaction between geosphere and biosphere. The increase of carbon dioxide is actually a release of C fertilizer, which will directly lead to the change of vegetation distribution. At the same time, for temperature-sensitive wild animals, such as giant pandas, the altitude of their lives will gradually increase with the increase of temperature, which will lead to the gradual fragmentation of their living environment, which will make it difficult to complete mating and reproduction, and eventually lead to species extinction. Many species related to ecological balance face this situation. Therefore, it is not only the weather process such as flood in the south, drought in the north, freezing cold wave in rain and snow, but also its influence will be far-reaching.
There are many aspects in the study of global change, among which the main work focuses on the study of past global changes. Based on a series of studies on stalagmites, peat beds, paleosol and fossils in Bingxin (Yaotan Cave), the environmental climate change and its species response in Cenozoic era, especially in recent 2000 years, were analyzed. It is used to understand the formation mechanism of global change, its impact on ecosystem, its response and its impact on human beings, so as to analyze and judge the future trend of global change. Traditionally, marine oxygen isotopes are used to determine ancient sea level, ancient temperature and precipitation sequence. Recently, some people have analyzed the composition of organic matter in many samples by means of geo-biological methods (such as Xie Shucheng). In a word, the science of global change is not only a work in the field of geochemistry (such as the Global C Plan), but is developing in an interdisciplinary direction. Especially in today's global change research, we pay special attention to process research. Paleontology and geo-biology should explore more research methods and provide more information to reflect the content of global changes in the past.
The study of global change needs extensive knowledge and strong comprehensive ability.
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