Antarctic Ecosystems: Environmental Contamination, Climate by R. Bargagli

By R. Bargagli

This quantity presents an outline of weather swap info, its results at the constitution and functioning of Antarctic ecosystems, and the incidence and biking of power contaminants. It discusses the position of Antarctic study for the safety of the worldwide setting. The booklet additionally examines attainable destiny eventualities of weather swap and the position of Antarctic organisms within the early detection of environmental perturbations.

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Extra resources for Antarctic Ecosystems: Environmental Contamination, Climate Change, and Human Impact (Ecological Studies, 175)

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Thus, sea ice may affect atmospheric circulation and precipitation at great distances from the immediate area. The formation of sea ice at the end of summer involves the rejection of dense, brine-rich waters, determining the formation of cold deep waters. Other dense bottom waters are formed by melting at the base of ice shelves. These cold, saline waters influence global oceanic circulation because they flow northwards along the ocean bottoms and can be detected well into the Northern Hemisphere.

Maintenance of the ice sheets is due to the balance between snowfall over the continent and the rate of ice discharge in the Southern Ocean. This balance strictly depends on temperature, the extent of sea ice, and water evaporation in the Southern Ocean, which affect the transport of heat, air masses and precipitation from mid-latitudes. It is very difficult to measure changes in the ice sheet over an area of 14¥106 km2; however, changes of a few percent in the total volume of ice would affect the volume of the world’s oceans.

Bargagli over the Antarctic ice sheets and sea ice, and the cloud cover increases the net radiative warming of surfaces. 6° W) stations was only about 10 % of the total global solar radiation, and the greater variability of cloud cover at Faraday Station determined the higher inter-annual variability of radiation at this station (King and Turner 1997). According to these authors, the average annual net long-wave cooling of Antarctic surfaces exceeds net solar heating by 10–20 W m–2. A positive average annual radiation balance occurs in Antarctic areas free of ice; however, their role in the radiation balance of the continent is almost negligible because of their small surface area compared to that of Antarctica.

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