全球变暖主要影响因素（Global warming is a major factor）
Water vapor is the world's richest greenhouse gas, but its status in global warming has been controversial, according to the daily science website. More recently, researchers have used the latest NASA satellite data, more scientific and accurate estimate its heat trapping ability in the air, to make sure it is an important factor of climate change. The research, funded by NASA, has been published in geophysical research letters by the American geophysical union.
Water vapor is identified as a major contributor to climate change
When we talk about greenhouse gases and climate change, carbon dioxide is often most widely attention, while carbon dioxide is by far the most major component of greenhouse gases, but there are some other gases.
What all greenhouse gases have in common is that they allow the sun's rays to enter the atmosphere, but absorb some of the infra-red radiation emitted outward and warm the atmosphere. Greenhouse gas helps to keep the earth's surface temperature in a more pleasant - nearly 59 Fahrenheit ° F (15 ℃). But as human activity produces more carbon dioxide, earth's average temperature is rising and causing dangerous climate change.
Carbon dioxide is often blamed for the crisis, which accounts for 80 per cent of greenhouse gas emissions. When home heating, cars, factories and plants burning fossil fuels such as oil, natural gas and coal, when cut down or burn the forest, when the production of cement, we took the carbon dioxide emissions
有关桥的对联into the atmosphere. Like carbon dioxide, methane and nitrous oxide predate human beings on earth, but the presence of humans increases their levels dramatically. Sulfur hexafluoride, fluorocarbon and HFCS are greenhouse gases produced by human activities. The emissions of these gases are also increasing. Water vapour is also a natural greenhouse gas, which increases with the warming of the climate, thus exacerbating the greenhouse effect caused by human activities.
英国大百科全书黎明演唱会Texas A&M University, Texas A&M University) Andrew dassler (Andrew Dessler) and his colleagues confirmed that the heating effect of the water vapor are strong enough, it is equal to the carbon dioxide in the atmosphere causing the global warming effect to strengthen. Scientists have used new observational methods to test how existing climate patterns affect global warming. Researchers using NASA's AQUA satellite atmospheric infrared detector (AIRS) captured by the latest data, the atmospheric humidity within the scope of the lowest layer of 10 km for precise measurements, combi
ned with the observation of the world's temperature, allowing the researchers to establish a of water vapor, carbon dioxide and other atmospheric warming gases between interaction, so as to obtain more comprehensive understanding.
Dassler said: "we all agree that, if the carbon dioxide emissions into the atmosphere, will lead to global warming. But the real question is, how much will the climate warming?" he said, the answer can estimate, from a series of feedback of water vapor increase will lead to rising temperatures, and rising temperatures will lead to more water vapor is absorbed into the air,
人口普查手抄报The absorption of warm and moisture is increased by the spiral period. Water vapour feedback can also amplify the effects of other greenhouse gas warming, such as warming caused by increased carbon dioxide, which can bring more water vapor into the atmosphere. "There is a big difference in atmospheric water vapor feedback," deisler said. "there is a strong and weak water vapor feedback." The climate model can estimate the strength of the water vapor feedback, but the previous record of water vapour data is not detailed enough to indicate a comprehensive relationship between the temperature change of the earth's surface and the change of water vapor. That's because on the ground and past space instruments can't measure all the high water vapor in the earth's troposphere, and the troposphere covers an altitude of about 1, 0 miles from the earth's surface.
The atmospheric infrared detector is the first device to measure the different amounts of water vapor in all altitudes of the troposphere. Using AIRS data, the team observed how surface temperature changes between 2003 and 2008 affected how the surface humidity changed. By determining how humidity changes with the surface temperature, the team can calculate the average strength of global water vapour feedback. "Data sets show that with the earth's surface temperature, air humidity is also increased." said dassler, "emissions of greenhouse gases to the atmosphere makes the atmosphere more wet. Because of the water vapor is a greenhouse gas, humidity increase and strengthen the effect of carbon dioxide to global warming." specifically, the team found that, if the earth warming of 1.8 degrees Celsius, every square metre (110 square feet) of water vapor will became trapped additional 2 watts of
energy. "This may sound like much, but all across the earth's surface water vapour is captured energy into account, you will find that the water vapor feedback is very powerful. It equal to the global warming effect of carbon dioxide in the atmosphere causing strengthened twice." Atmospheric scientist at NASA's jet propulsion laboratory Eric fee policy, said: "this study confirmed that the model can actually occur in the atmosphere, water vapor is an important factor of climate change."
The dangers of global warming
Because new precise observations to assess the effect of water vapor as it has always been consistent, the researchers use the model prediction method scientists than ever more reason to believe that the earth's major greenhouse gases will the club before the end of the century the global temperature rise a few degrees. The specific hazards of global warming to earth and humanity in the future include:
The heat. The actual measurement of global temperature increase shows that the global temperature increase is very obvious. In recent years, the temperature has been rising fiercely. Twenty of the 25 warmest years have been measured in the last 25 years. Heatwaves have started to appear, and scientists believe such heatwaves will be more common if global warming is not addressed. In the summer of 2003, Europe suffered a powerful heatwave that killed 35, 000 people.
The glacier melts. Almost all of the world's glaciers are melting, many of them melting particularly fast. Mount kilizlo in Tanzania, which has been known for its snow-covered,
元旦文案简短glacier-covered glaciers, is now melting with snow and shrinking glaciers.社保断交有什么影响
The boulder Glacier National Park in Montana, a famous tourist attraction in the 1930s, is running out of ice. Scientists believe that all the glaciers in the park could be completely extinct within five ye
ars. There are two places on earth that can serve as canaries in coal mines - they are most sensitive to the effects of global warming. One is the North Pole, the other is the South Pole. In these two icy areas, scientists have observed a faster change, with climate change making a bigger impact than anywhere else on earth. From photographs, the poles of the earth are very similar, covered by snow and ice. However, there is a huge difference beneath a similar surface, with an average of less than 10 feet of ice in the North Pole compared with the vast ice cap of tens of thousands of feet in the South Pole. The roots of this distinction lie beneath the ice: the South Pole is the land surrounded by the sea, and the arctic is a sea surrounded by land. The thin arctic sea ice and the permafrost that surrounds the Arctic Circle in the north of the Arctic Circle make them particularly vulnerable to a sudden rise in temperatures. This has the most significant effect of global warming in the arctic: accelerated melting of the ice. The temperature rises there faster than anywhere else on earth. The melting of the arctic ocean has had a profound impact on global climate patterns.
The flood. In many parts of the world, global warming has also increased the percentage of rainfall in annual rainfall (including rain, snow, etc.) that causes more flooding in spring and early summer. When the United States came to an end
版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。
发表评论