The continued snow fall at the beginning of a glacier pushes the front of the ice forward at a slow but steady rate, often millimeters to meters per year (meters on the really fast end). This forms into a thick sheet of snow that eventually compresses into mostly ice. Typical glaciers form in cold weather up in the northern latitudes or higher altitudes when the snow fall is greater than the snow melt during the summer, hence more snow accumulates than can melt. Now they never call them glaciers but there is no doubt that this is what they are meant to be. This white in the ice ages was representative of glaciers, a thing far different than those frozen blocks of water presented in the movie. Looking at the map they presented (again, pictured above left), they show a world much as it is represented during the ice age, with white covering the landmasses.
But with their freezing of the oceans they tread dangerously close to "glaciers". The current pace of global warming, spurred by the human release of greenhouse gases into the atmosphere, brings an increased risk of more frequent and intense heat waves, higher sea levels, and more severe droughts, wildfires, and downpours.1:09:02 - The snow covered world represented in the image above left (as seen in the movie) was supposed to represent snow and ice fall (I assume). The National Research Council report Abrupt Impacts of Climate Change: Anticipating Surprises identifies potential abrupt changes in the ocean (which could result in rising sea levels and influence ocean circulation), the atmosphere (which could increase the frequency and intensity of extreme events), at high latitudes (including loss of Arctic sea ice), and ecosystems (species shifts, extinctions, and rapid state changes). There are a number of potential “tipping points” in the Earth’s climate system – when a threshold could be crossed, resulting in substantial change. While most of The Day After Tomorrow is safely in the realm of science fiction, there is some real science to back up concerns about potentially irreversible changes in our climate within a couple of decades that would affect our communities, health, infrastructure, and ecosystems. But when scientists talk about abrupt climate change, they mean climate change that occurs over decades, rather than the usual centuries. In the movies, abrupt climate change can happen practically overnight. The result is a catastrophic storm and a dramatic change in the global climate.
The movie The Day After Tomorrow is loosely based on the theory of “abrupt climate change.” The plot of the movie is that, as a result of global warming, ocean currents that circulate water around the world shut down, heating up the tropics and cooling the North Atlantic.
0 kommentar(er)
