Improving the Sea Surface
Changes of average height measured from sea-level areas with a stable environment in geologi.Ketika atmosphere warms, the ocean surface layer will be warmer, so the volume will grow and raise the sea level. Warming will also melt much glacier ice, especially around Greenland, further swelling the sea. Sea levels worldwide rose 10 - 25 cm (4 - 10 inches) during the 20th century, and IPCC scientists predict a further rise of 9 to 88 cm (4 to 35 inches) in the 21st century.
Sea-level changes will complicate life in the coastal region. Increase of 100 cm (40 inches) will submerge 6 percent of The Netherlands, 17.5 percent of Bangladesh, and many islands. Erosion of cliffs, beaches, and dunes will increase. When the high seas to reach the mouth of the river, flooding caused by high water will rise on the mainland. Rich countries will spend huge amounts of money to protect the shorelines, while poor countries may simply evacuate from coastal areas.
Even a modest rise in sea level will greatly change coastal ecosystems. Increase of 50 cm (20 inches) will submerge about half of coastal wetlands in the United States. New marshes will form in, but not in urban areas and regions that have been built. This sea-level rise will cover much of the Florida Everglades.
Monday, November 30, 2009
Wednesday, November 25, 2009
Climate Start Unstable
Scientists use computer models of temperature, precipitation patterns, and atmosphere circulation to study global warming. Based on these models, scientists have made several predictions about the impact of global warming on weather, sea levels, coastal, agricultural, wildlife and human health.
[edit] Climate Start Unstable
Scientists predict that during global warming, the northern part of the Northern hemisphere (Northern Hemisphere) will heat up more than other regions on Earth. As a result, icebergs will melt and the land will shrink. Will be less ice will float on northern oceans. Areas that previously experienced light snow, may not be there again. In the mountains in subtropical areas, snow-covered parts will be less and will melt faster. Growing seasons will be longer in some areas. Temperatures in the winter and at night would tend to increase.
Warmer regions will become more humid as more water evaporates from the oceans. Scientists are not sure whether the moisture is actually going to increase or decrease heating further. This is because water vapor is a greenhouse gas, so that its presence will increase the insulation effect on the atmosphere. However, the more water vapor will also develop a lot more clouds, which would reflect sunlight back into space, where it will reduce the heating process (see the water cycle). High humidity will increase rainfall, on average, about 1 percent for each Fahrenheit degree of warming. (Rainfall in the world has increased by 1 percent in the last hundred years) [29]. The storm will become more frequent. In addition, the water will evaporate faster than the ground. Some regions will become drier than before. Winds will blow harder and perhaps with a different pattern. Hurricane (hurricane) that obtain power from the evaporation of water, will become larger. Contrary to the warming is happening, some very cold periods will probably happen. Weather patterns become more unpredictable and extreme.
[edit] Climate Start Unstable
Scientists predict that during global warming, the northern part of the Northern hemisphere (Northern Hemisphere) will heat up more than other regions on Earth. As a result, icebergs will melt and the land will shrink. Will be less ice will float on northern oceans. Areas that previously experienced light snow, may not be there again. In the mountains in subtropical areas, snow-covered parts will be less and will melt faster. Growing seasons will be longer in some areas. Temperatures in the winter and at night would tend to increase.
Warmer regions will become more humid as more water evaporates from the oceans. Scientists are not sure whether the moisture is actually going to increase or decrease heating further. This is because water vapor is a greenhouse gas, so that its presence will increase the insulation effect on the atmosphere. However, the more water vapor will also develop a lot more clouds, which would reflect sunlight back into space, where it will reduce the heating process (see the water cycle). High humidity will increase rainfall, on average, about 1 percent for each Fahrenheit degree of warming. (Rainfall in the world has increased by 1 percent in the last hundred years) [29]. The storm will become more frequent. In addition, the water will evaporate faster than the ground. Some regions will become drier than before. Winds will blow harder and perhaps with a different pattern. Hurricane (hurricane) that obtain power from the evaporation of water, will become larger. Contrary to the warming is happening, some very cold periods will probably happen. Weather patterns become more unpredictable and extreme.
Friday, November 20, 2009
Climate models
Climate models
Forecast increase in temperature of several scenarios stability (colored ribbons) based on the report to the Fourth IPCC view. Black line shows the best forecasting; red and blue lines show the limits of possibility that can happen.
Calculation of global warming in 2001 from several climate models based on the SRES A2 scenario, which assumes no action is taken to reduce the main emisi.Artikel for this section are: global climate model
Scientists have studied global warming based on computer models based on the basic principles of fluid dinamikan, radiation transfer, and other processes, with some simplifications due to the limited computer capabilities. These models predict that the addition of gases to the greenhouse effect and warmer climate. [23] Although the assumptions used are similar to the concentration of greenhouse gases in the future, the climate sensitivity would still be in a certain range.
By inserting the elements of uncertainty to the concentration of greenhouse gases and climate modeling, the IPCC estimates that warming of about 1.1 ° C to 6.4 ° C (2.0 ° F to 11.5 ° F) between 1990 and 2100. [1] climate models are also used to investigate the causes of climate change is happening right now by comparing the observed changes with the results of the model predictions to various causes, both natural and human activities.
Current climate models produce a fairly good resemblance with the global temperature changes observed during the last hundred years, but did not simulate all aspects of the climate. [24] These models are not exactly state that the warming occurred between 1910 and 1945 caused by natural processes or human activities; but they show that the warming since 1975 is dominated by the emission of gases that humans produce.
Most climate models, when calculating the future climate, based on scenarios of greenhouse gases, usually from the Special Report on Emission Scenarios (Special Report on Emissions Scenarios / SRES) IPCC. Which is rarely done, the model calculated by adding a simulation of the carbon cycle; that usually produces positive feedback, although the response is uncertain (for the A2 SRES scenario, responses vary between 20 and addition of 200 ppm CO2). Several studies also show some positive feedback. [25] [26] [27]
The influence of clouds is also one source of uncertainty to the models produced today, although now there has been progress in resolving this issue. [28] We also occur the discussions were still ongoing as to whether climate models exclude the effects of feedback and not directly from the variation of the Sun.
Forecast increase in temperature of several scenarios stability (colored ribbons) based on the report to the Fourth IPCC view. Black line shows the best forecasting; red and blue lines show the limits of possibility that can happen.
Calculation of global warming in 2001 from several climate models based on the SRES A2 scenario, which assumes no action is taken to reduce the main emisi.Artikel for this section are: global climate model
Scientists have studied global warming based on computer models based on the basic principles of fluid dinamikan, radiation transfer, and other processes, with some simplifications due to the limited computer capabilities. These models predict that the addition of gases to the greenhouse effect and warmer climate. [23] Although the assumptions used are similar to the concentration of greenhouse gases in the future, the climate sensitivity would still be in a certain range.
By inserting the elements of uncertainty to the concentration of greenhouse gases and climate modeling, the IPCC estimates that warming of about 1.1 ° C to 6.4 ° C (2.0 ° F to 11.5 ° F) between 1990 and 2100. [1] climate models are also used to investigate the causes of climate change is happening right now by comparing the observed changes with the results of the model predictions to various causes, both natural and human activities.
Current climate models produce a fairly good resemblance with the global temperature changes observed during the last hundred years, but did not simulate all aspects of the climate. [24] These models are not exactly state that the warming occurred between 1910 and 1945 caused by natural processes or human activities; but they show that the warming since 1975 is dominated by the emission of gases that humans produce.
Most climate models, when calculating the future climate, based on scenarios of greenhouse gases, usually from the Special Report on Emission Scenarios (Special Report on Emissions Scenarios / SRES) IPCC. Which is rarely done, the model calculated by adding a simulation of the carbon cycle; that usually produces positive feedback, although the response is uncertain (for the A2 SRES scenario, responses vary between 20 and addition of 200 ppm CO2). Several studies also show some positive feedback. [25] [26] [27]
The influence of clouds is also one source of uncertainty to the models produced today, although now there has been progress in resolving this issue. [28] We also occur the discussions were still ongoing as to whether climate models exclude the effects of feedback and not directly from the variation of the Sun.
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