Saturday, 17 April 2010

Increasing Temperature changes global Atmosphere

The effects, or impacts, of Increasing Temperature causes climate change which may be physical, ecological, social or economic. Evidence of observed climate change includes the instrumental temperature record, rising sea levels, and decreased snow cover in the Northern Hemisphere.Some impacts from increasing temperatures are already happening.

Ice is melting worldwide. This includes mountain glaciers, ice sheets covering West Antarctica and Greenland, and Arctic sea ice. Numbers of Penguins on Antarctica have fallen from 32,000 breeding pairs to 11,000 in 30 years.

Sea levels are rises unexpectedly between 7 and 23 inches (18 and 59 centimeters) by the end of the century. Between 1993 and 2003, the rate increased above the previous period to 3.1 [2.4 to 3.8] mm/yr. and continued melting at the poles could add between 4 and 8 inches (10 to 20 centimeters).

Hurricanes like Katrina and other storms are likely to become stronger.Floods and droughts will become more common. Rainfall in Ethiopia, where droughts are already common, could decline by 10 percent over the next 50 years.

Fresh water will be less available. If the Quelccaya ice cap in Peru continues to melt at its current rate, it will be gone by 2100, leaving thousands of people who rely on it for drinking water and electricity without a source of either.Varieties diseases will spread.Such as malaria carried by mosquitoes.

Ecosystems will change. According to Wildlife research scientist Martyn Ob bard found that since the mid-1980s, with less ice on which to live and fish for food, polar bears have gotten considerably skinnier. A similar pattern has found in Hudson Bay by Polar bear biologist Ian Stirling.  He fears that if sea ice disappears, the polar bears will as well.

Friday, 9 April 2010

greenhouse gases effects In Earth's atmosphere

In Earth's atmosphere there are many environmental problems coming from the increase concentration of greenhouse gases. As ABC NEWS reported by Jeff Rubin, there are many signs indicate that we have begun changing Earth's climate: glaciers and polar ice caps appear to be melting,increased water vapor in the atmosphere, floods and droughts coming more severe, and sea level rising continuously, on average, between 4 and 10 inches since 1990( For global warming we are already began to see more flooding, more droughts. According to Jane Lubchenco if this situation is continuing we must see 2 foot rising sea level by 2100 and this level will continue to rise 2 or 3 feet per century, for 1000 years.

These rises in sea level cause coastal lands to be washed under the ocean as a result increase the
salinity of freshwater throughout the world. Increased humidity and Warmer water may encourage tropical cyclones, and changing wave patterns could produce more tidal waves and strong beach erosion on the coasts.

The greenhouse effect is the rise in temperature due to the presence of greenhouse gases. Greenhouse gases in the atmosphere behave much like the glass panes in a greenhouse. Sunlight enters the Earth's atmosphere, passing through the blanket of greenhouse gases. As it reaches the Earth's surface, land, water, and biosphere absorb the sunlight’s energy. Once absorbed, this energy is sent back into the atmosphere. Some of the energy passes back into space, but much of it remains trapped in the atmosphere by the greenhouse gases, causing the lower atmosphere to warm.

The greenhouse effect is important. The Earth would not be warm enough for humans to live without the greenhouse effect. But if the greenhouse effect becomes stronger, it would be harmful for us and it could make the Earth warmer than usual. Even a little extra warming may cause problems for humans, plants, and animals.

Sunday, 4 April 2010

Global Temperature Changes Rapidly

The earth is warming up continuously. In the past 30 years Global surface temperature has increased ˜0.2°C per decade due to global warming. The temperature in 1998, on the contrary, was lifted 0.2°C above the trend line by a “super El Niño”, the strongest El Niño of the past century. Record, or near record, warmth in 2005 is notable, because global temperature did not receive a boost from an El Niño in 2005.

The National Geographic Channel aired a documentary in Britain on August 9, 2003 titled What’s up with the weather. It noted that the levels of carbon dioxide for example, were currently at their highest levels in the past 450,000 years.

If we turned to conclusion that global warming is a real climate change, not an artifact due to measurements in urban areas, is confirmed by surface temperature change inferred from borehole temperature profiles at remote locations, the rate of retreat of alpine glaciers around the world, and progressively earlier breakup of ice on rivers and lakes (10). The geographical distribution of warming

Saturday, 3 April 2010

Global Warming is Changes The Earth System

Earth is a dynamic place. But recently scientists have been noticing,Global warming changes the Earth system due to way land is used and pollution. These changes are changing the regular patterns of the system.

Earth system are changing in many different ways. Materials are moving around the Earth system.Rocks form and reform through the rock cycle. Water flows through the water cycle. Elements are moving between living and nonliving parts of the Earth system through bio geochemical cycles like the carbon cycle and nitrogen cycle. Ocean Motion and the atmosphere have an impact on the Earth system too.

How the parts of the Earth System are affecting and how they impact climate, Scientists are also studying that.When aspects of the system are changed the Earth reacts because of warming.Some reactions shrink the amount of warming while other reactions lead to even more warming. These reactions are called feedbacks.

Reactions of the Earth system that shrink the impacts of a change are called negative feed backs and Reactions that exaggerate the impacts are called positive feed backs.

Analysing the negative and positive feedbacks of the Earth system is an area of active research in climate science. How climate will continue to change in the future, new information about feedbacks into climate models will allow us to better predict.