chemistry (ocean) :: essays research papers

What is an screwballberg? Why are they blue or green?An chicken feedberg is a large floating block of freshwater crosspatch that has broken collide with the edge of a glacier and been carried out to sea near 90% of its big money lies under the water. The bluish streaks of clear, bubble free meth often seen in icebergs results from the refreezing of melt water which fills crevasses formed in the glacier as it creeps bothplace land. The ice is blue because of the natural light scattering characteristics of pure ice. at times airborne dust or dirt eroded from land ends up on the glacier surface eventually forming a noticeably darkened dark-brown or black layer (in any orientation) within the ice of a floating iceberg.What oddball of information cornerstone scientists obtain from polar ice?Polar Regions and some alpine areas are sufficiently cold that coke accumulates from year to year, building up as glaciers. As nose candy at the surface gets buried with time it gets c ompressed to form substantive ice and this ice carries with it information about the climate when the snow to begin with fell. By drilling down into a glacier and recovering this old ice, the information can be used to help understand past climate.The information obtained from ice cores can be divided into three types. The first of these types of information comes from the solid and dissolved impurities in the snow. Usually snow that falls in those places is about pure water, but it still contains traces of dust, and pollutants from human activities. This information can be used to detect major environmental changes in the circulation of the atmosphere. The second type of information obtained from ice cores comes from bubbles in the glacier ice. These bubbles are formed as snow becomes compressed and the air between the flakes gets trapped. The third type of information obtained from ice cores comes from the frozen water itself. In the oceans, one in about every 500 oxygen atoms i s the heavy isotope, while one in about 70 hydrogen atoms is heavy. However as the water evaporates and is transported to polar regions, the salmagundi of the heavy isotopes changes. These changes are mostly influenced by temperature and it turns out that by standard water isotopes in ice cores researchers can infer temperatures when the snow originally fell. In the past 30 years, many ice cores have been cut to study past climate.