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Global warming and its effects on polar ice caps
Melting polar ice caps + climate change
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The planet we live in, the earth is a tiny composition in this huge universe. It has diversities ranging from highly variant temperature and pressure belts as well as various ecosystem types. One such remarkable feature of the earth is the polar ice caps. There are three major prominent features, the Antarctic ice on the South Pole, the Arctic ice on the North Pole and Greenland on the north between North America and Europe. Antarctica consist about 90 percent of the world's ice (and 70 percent of its fresh water). It is covered with ice an average of 2,133 meters (7,000 feet) thick. If all of the Antarctic ice melted, sea levels around the world would rise about 61 meters (200 feet). The Arctic ice is not so thick in comparison and it mostly floats in the Arctic Ocean. Greenland, on the other hand would add another 7 meters (20 feet) to the oceans if it melted because Greenland is closer to the equator than Antarctica, the temperatures there are higher, so the ice is more likely to melt. Scientists from the Universities of London and Edinburgh say that ice loss in Antarctica and Greenland together contribute approximately 12 percent of the rise in sea levels. The melting of these enormous ice bodies can significantly impact the global changes in climate and reversely, this climate changes also impact the melting of the ice bodies. It is a two way process and the causes are mostly anthropogenic.
Recent studies based on satellite monitoring by NASA reveals that melting ice from both the poles has been responsible for a fifth of the global rising sea levels since 1992 (11 mm). Antarctica and Greenland are now contributing three times as much ice to sea levels as they were 20 years ago. Although the Greenland ice sheet is only about...
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...arth has always varied from time to time, since the time the earth was formed and it is one of the most unpredictable processes. Though it is a natural process, anthropogenic contributions are also accounted upon heavily these days. According to studies, although the earth is supposed to be experiencing a cooling phase at this time, it is evident from the polar ice caps melting that the earth is warming. The polar ecosystem is hence going through a phase of dynamism more due to external disturbances such as rising temperature and ocean thermal expansion. Therefore the need of the hour is to be aware about the changes in the ecosystem that is occurring and to come together to either prevent or adapt to the changing conditions. Only then can a ecosystem function in a healthy manner with its species diversity and good interaction among themselves and their environment.
It is predicted that the effect of permafrost melting will be that the ocean levels will rise and will significantly increase the temperature and accelerate the rate at which global warming occurs. Permafrost covers 24% of the land in the Northern Hemisphere (Insert Citation), if this was to melt 1700 gigatonnes of methane and carbon dioxide (Insert Citation), powerful heat trapping gases, would be released into the atmosphere increasing the amount of greenhouse gases by 200%.
Various glaciers in Alaska and other parts of the United States have shrunk dramatically. If temperatures continue to rise, the ice will continue to melt, and some glaciers could disappear completely, which causes sea levels to rise. There are many animals, birds, and seafood that depend solely on glaciers for survival. With an increase in sea water temperature, and increasing sea levels, sea-plants that these fish thrive on will be lost, lowering the number of seafood, which in-turn will make survival of many species difficult. The arctic is source region for cold ocean currents and with no ice it will have no density and temperature distinctions, which pushes the ocean currents. If the ocean current heat transfer mechanism powers down,
Climate change is arguably one of the most discussed issues in climatic conferences and political debates across the world. Establishment of the fact that global warming is the leading cause of climate change continues to persuade people to find out ways of reducing or mitigating the effects it has on the earth. Global warming occurs naturally, but artificial causes, which are mainly human activities, contribute to this effect. The release of greenhouse gases such as carbon dioxide from human activates has led to a 0.60C rise in global temperatures (Walther et al., 2002). This implies that different life forms are affected in one way or the other given the effect of temperature on life. Different species of flora and fauna have and continue to suffer the effect of climatic changes.
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 southern high precipitation zone is largely determined by the Icelandic low and the resulting onshore flow which is forced to ascend the surface of the ice sheet. In contrast to Antarctica, summer temperatures on Greenland are high enough to cause widespread summer melting. This results in an ablation zone with negative mass balance all around its perimeter. Ablation rates are highest over the southwestern part of the ice sheet where...
Imagine the world where all the ice of the poles has melted away. Much of northern Europe is a part of the Atlantic Ocean. Florida is completely submerged underwater. Memphis Tennessee is now a coastal city along the Gulf Coast. It was different once. Cities like Miami and London use to be popular tourist destinations in the early 21st Century. All of the low lying cities like Miami, New Orleans, London, and Paris are under hundreds of feet of water. The ice locked in the ice sheets of Greenland and Antarctica has melted away, dumping most of our freshwater into the seas. Much of our freshwater supply and farmland is not contaminated or swallowed by the rising oceans since the West Antarctic and Greenland ice sheets melted. How could we as people prevent this massive disaster that the world has never been experienced before?
A. Sea level rise- The temperatures around the globe rise, the oceans start to warm up and water expands, the ice caps and glaciers start to melt, and more precipitation starts to fall falls instead of snow. These are some of the causes for sea levels rising. Recorded by the Department of Ecology, the sea levels have risen four to ten inches in the past one hundred years. When the climate changes it usually increases the oceans temperatures, causing water to expand which causes the sea level to rise by thermal expansion. When the water amount begins to take up more space. The sea level rising depends souly on the temperature of the ocean. Climate Change is also effected by ice glaciers melting over areas of land, which run off into our oceans. A big contribution to climate change and sea level rising is the melting ice masses of Antarctica and Greenland.
Ecological shifts are threatening billions of coastal residents around the world. Planet Earth is shifting severally. Temperatures are rising, glaciers are melting, hurricanes are growing stronger, and oceans are expanding and covering coasts at disturbing rates. Many people question the reason of sea rise levels. But it is not a myth, scientist have proven that the icebergs 1that sit on Greenland and Antarctica land are melting at a rapid rate. But unfortunately, that is not the biggest contributor to this problem. Most of the sea rise levels are a cause of the rising temperatures of the water in the top surface of the oceans. Water expands when it is frozen, but it also expands when heats up.
In many parts of the world, ecosystems’ temperatures begin to rise and fall to extreme levels making it very difficult for animals and plants to adapt in time to survive. Climate has never been stable here on Earth. Climate is an important environmental influence on ecosystems. Climate changes the impacts of climate change, and affects ecosystems in a variety of ways. For instance, warming could force species to migrate to higher latitudes or higher elevations where temperatures are more conducive to their survival. Similarly, as sea level rises, saltwater intrusion into a freshwater sys...
There is no longer any question that our world climate has changed (King, 2004). Over the last 100 years, "temperatures have risen by about 0.6 degrees Celsius and global sea level has risen by about 20cm" (K...
Jacob, T., Wahr, J., Pfeffer, T. W., & Swenson, S. (2012). Recent contributions of glaciers and ice caps to sea level rise. Nature, 514-518. http://dx.doi.org/10.1038/nature10847
The shrinking of polar ice caps is caused by increasing tourism, shipping, and major oil field expansion. As more people and companies begin to travel towards the arctic, the more global warming occurs affecting ice coverage. “Polar ice which has been shrinking at a rate of 12% a decade since the late 1970’s and was at a record in October” (CQ Researcher 994). The rate per year of melting of ice caps is too high and is causing major destruction and arising new problems. As ice melts, it turns to water which unhealthy for the environment. “ Harmful solar energy that would of been reflected off of the ice and back into space is instead absorbed by the ocean, warming water and further exacerbating climate change,” (Brown 2). Because of ice melting, passageways open up for tourism. The once desolate arctic is now populated with cruise ships and people venturing into the region.
Scientists appear to have become aware of the issue of rising sea levels in the mid to late 1980s. An article published in Science News in 1987 predicted that “global warming… will cause… the world's oceans to expand, raising the average sea level by 4 to 8 centimeters in the next 40 years” (Monastersky). Though 4 to 8 centimeters sounds like a miniscule amount in relation to the vastness of the world’s oceans, this early article disturbed many readers. Many for this reason: early stud...
With rapid global warming and climate change, one-fourth of the earth’s species could be headed for extinction by 2050 (Nature Conservancy, 2010). Riebeek (2010) explains that global warming is the rapid increase in the earth’s average surface temperature over the past century and is primarily due to the increase in greenhouse gases within the earth’s atmosphere. This current cycle of global warming is changing the rhythms of the climate that all living things have come to rely upon. Currently, these changes are having the most visible and significant impacts to the Polar Regions. Marine and terrestrial fauna at the earth’s polar regions are negatively impacted by global climate change due to the increase in temperatures most of which are now listed as endangered species due to the destruction of their habitat and alteration of their food web.
These emissions have caused the Earth's surface temperature to rise, and the oceans absorb about 80 percent of this additional heat. Therefore Woodard states, “...the glaciers in this area drain the West Antarctic Ice Sheet, a precariously balanced portion of the southern ice cap that contains enough ice to raise sea levels by 20 feet…”, which means higher temperatures caused by global warming have led to diminished snowfall due to later winters and earlier springs. This imbalance results in a significant change to ocean evaporation; inevitably, causing sea levels to rise.Rising seas will push hundreds of millions of people live in coastal areas to new areas leaving the grounds that will become progressively vulnerable to flooding. In relation to Hinrichsen by stating, “ In the United States, studies suggest that up to 43 percent of remaining coastal wetlands would be submerged, mostly along the Atlantic and Gulf coast”. Rising seas will push hundreds of millions of citizens that live in coastal areas to new areas leaving the grounds that will become progressively vulnerable to flooding.. Consequently do to soaring water quantity, there will be an increase flood threats everywhere near the coast line, prompting flash flooding during extreme natural disasters. This will cost millions more of taxpayers money to fix damages and destruction. Rivers and lakes exposed by saltwater will contaminate the freshwater , affecting runoff, drinking water, and triggering death to native freshwater fish. Not only can increasing water volume damage properties, it can also alter weather patterns. Increasing temperatures and melting ice in the Arctic regions are creating more snowfall in the autumn months at lower latitudes, which affects an atmospheric pattern that leads to colder winters. As stated by Hanses ”... increasing
The polar regions are most affected and vulnerable to the warming temperatures because the poles are covered in ice. The world’s ice sheets are melting faster than ever and temperatures in the Arctic region are rising twice as fast as anywhere else on Earth according to the NRDC. This will have a serious impact on people, wildlife and plants in that region. The National Climate Assessment has said that “By the year 2100, it 's estimated our oceans will be one to four feet higher, threatening coastal systems and low-lying areas, including entire island nations and the world 's largest cities, including New York, Los Angeles, and Miami as well as Mumbai, Sydney, and Rio de Janeiro”. Polar bears are in great threat as the ice sheets melt because they use the ice to travel across the land and hunt. As the sea-ice platforms move further apart, the swimming conditions become more dangerous. The U.S Geological Survey done by the National Wildlife Federation predicts that by the year 2050, two thirds of all polar bears will disappear. Researcher Bill Fraser has tracked the Adelie penguins in Antarctica and reported the numbers have fallen from 32,000 to only 11,000 over the last 30