They predict that by 2100 sea levels will have risen an average of about 10 to 23 inches (nrdc.org). Between the months of January and March of 2002, a piece of the Larsen B shelf in Antarctica collapsed. The Piece of the ice shelf was the size of Rhode Island, scientist found this surprising and alarming because it just proves that global warming is really affecting us even if we can’t see it happening. There are many contributing factors in what is really causing global warming. Scientist believe that the number one cause of global warming is humans.
Sun is the ultimate source of heat energy which fuelling the weather systems after reaching to the earth. Earlier the harsh and extended bitter cold season was called as the little ice age which was due to the huge level variations in the solar activity. It is found that the positive human activities may play major roles in shaping earth’s climate. Such a huge variations in the climate may lead to the danger of the human lives. Earlier it was believed that shifts in the climate pattern from ice age to warmer periods was because of time however later it was imagined that it is due to regular melting of ice sheets of more than a kilometer in thickness.
(2010), this has been especially so in the light of the indications of the three summers from 2007 to 2009. The recent research by Cai et al. has been built on the postulation that more and more CO2 would be absorbed from the atmosphere under ice-free conditions in the Arctic Ocean. Therefore, the research investigates the impact of sea ice melt on the concentration of CO2 on the surface water of the Ar... ... middle of paper ... ...temperatures will continue causing ice melt in summer. Consequently, the surface water carbon dioxide partial pressure will continue to increase, further reducing the ability of the CO2 sink to take up more CO2.
Glaciers are melting up which results in the rise of sea level, oceans are turning more acidic. These climatic changes shall throw more challenges to our environment. Greenhouse effect and Greenhouse gases: Earth absorbs lot of energy from sun and gets warmth during the day. It gets cooled down by releasing infrared radiations. But the greenhouse gases do not let the infra-red radiations escape into the outer space.
· Cooling Poles Recently, scientists found that temperatures in the Arctic have been cooling since the 1920s. Computer predictions are that, if the world is warming, the Poles should warm twice as much. · Disappearing Glaciers Ice is melting all over the planet. Glaciers are melting on six continents. If present warming trends continue, all glaciers in Glacier National Park could be gone by 2030.
Ice reflects more of the Sun’s radiation than open water, but ice coverage is decreasing due to global warming. As the amount of oceanic ice decreases, the amount of absorbed radiation increases, warming the ocean and creating a positive feedback loop. The scientific community is only beginning to understand the many ways, such as this one, that climate change will manifest itself. With demand high for more research, the Intergovernmental Panel on Climate Change (IPCC) was established by the World Meteorological Organisation (WMO) and the United Nations Environme... ... middle of paper ... ...ven if the climate is stabilised. Together, the present Antarctic and Greenland ice sheets contain enough water to raise sea level by almost 70m if they were to melt.
There are three factors that contribute into sea level rise in the arctic. Primarily, the water expansion due to higher temperatures causing sea level to rise. Higher temperature causes thermal expansion which causes less dense water that takes up more space in the ocean. Secondly, melting of the glaciers that can contribute to sea level rise. And finally, the most serious cause is the melting of the ice sheets in the Antarctica which can contribute to 7 meters rise in sea level in coming years.
Although this phenomenon is not experienced on all regions around the globe, the average temperatures on the globe have increased by 0.7°C since 1900 (Hansen et al., 2006). According to Houghton et al. (2001), fluctuations in glaciers serve as one of the distinctive natural indicators of climate change because of their sensitivity. One of the underlying notions is that fluctuations in glaciers are mainly due to climate change. The original thought is that climate change mainly results in increase in global temperatures and consequently the melting of ice, snow and shifting of glaciers.
PHYSICAL-GEOGRAPHIC SETTING The ice sheet extends from about 60° to 83°N over a distance of 2,400 km in the North Atlantic Ocean. The ice sheet covers 1.71 million km2 , or roughly 80% of the surface of Greenland. It consists of a northern dome and a southern dome, with maximum elevations of 3,230 m and 2,850 m, respectively, linked by a long saddle with elevations around 2,500 m. Its total volume is about 2.85 million km3, which, if it were to melt entirely, would raise global sea level by about 7.2 m. The ice sheet has an average thickness of 1,670 m and reaches a maximum of 3,300 m in the center. The bedrock surface below the ice sheet is an extensive flat area near sea level, which would rebound by as much as 1,000 m if the ice sheet were to be removed (Figure 1). Precipitation over Greenland generally decreases from south to north, ranging from about 2,500 mm per year in the southeast to less than 150 mm per year in interior northeastern Greenland.
The main cause of the rise of ocean level is because glaciers are melting. With the climate change, specialists of environment can see an increase of temperature. This increase unbalance the glaciers cycle so in the winter, a glacier cannot regenerate enough faster to be at a normal size at summer. It’s like a vicious circle. For statistics, 53 percent of 17-18 years old respondents think melting of glaciers is the main cause of ocean rise level and 50 percent of the 19-20 years old respondents think the same things.