Download PDF by R. Bargagli: Antarctic Ecosystems: Environmental Contamination, Climate

By R. Bargagli

ISBN-10: 3540220917

ISBN-13: 9783540220916

ISBN-10: 3540264655

ISBN-13: 9783540264651

ISBN-10: 3540740058

ISBN-13: 9783540740056

This quantity presents an outline of weather swap facts, its results at the constitution and functioning of Antarctic ecosystems, and the prevalence and biking of continual contaminants. It discusses the position of Antarctic examine for the safety of the worldwide atmosphere. The booklet additionally examines attainable destiny eventualities of weather swap and the function of Antarctic organisms within the early detection of environmental perturbations.

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

Sample text

According to Kemp (2002), in this period many meteorological stations were moved from urban centres to rural or semirural airport locations, and this may have produced an apparent, artificial cooling. In any case, the 1990s was a very warm decade, and 1998 was the warmest year in the instrumental record since 1861. Proxy data from the Northern Hemisphere indicate that the temperature rise in the 20th century was probably the largest of any century during the past 1,000 years (IPCC 2001). Thus, if in the 1980s the majority of scientists 28 R.

Bargagli Atmospheric circulation in Antarctica reflects theoretical models for polar locations: during their progressive subsidence along a gradient towards the pole, the cold and dense air masses are deflected by the rotation of the Earth, forming a clockwise vortex. In winter, the steep temperature gradient between the air in the vortex and that to the north acts as a barrier. As a result, highpressure systems are dominant in the South Pole, accompanied by the circumpolar flow of strong westerly winds (Drake 1995).

The katabatic outflow moves near-surface air masses over the Southern Ocean north of the continent, and these masses rise (between 65 and 55° S) in areas with cyclonic activity. The circulation between Antarctica and sub-polar latitudes is responsible for a seasonal cycle of mass loading onto the continent during the spring, and net transport away from it in autumn. This mass flux across the Antarctic coastline is due to the solar insolation cycle, which is responsible for very large changes in surface atmospheric pressures up to the subtropics.

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Antarctic Ecosystems: Environmental Contamination, Climate Change, and Human Impact (Ecological Studies, 175) by R. Bargagli

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