Ozone depletion over Antarctica

Atmospheric depletion of mercury over Antarctica during glacial periods

Mercury is a globally dispersed toxic metal that affects even remote polar areas. During seasonal atmospheric mercury depletion events in polar areas, mercury is removed from the atmosphere1,2 and subsequently deposited in the surface snows3. However, it is unknown whether these events, which have been documented for the past two decades, have occurred in the past. Here we show that over the pa...

Ozone Depletion

Investigation of Arctic ozone depletion sampled over midlatitudes

Investigation of Arctic ozone depletion sampled over midlatitudes during the Egrett Campaign of spring/summer 2000 D. E. M. Ross, J. A. Pyle, N. R. P. Harris , J. D. McIntyre, G. A. Millard, A. D. Robinson, and R. Busen JMP Consultans, London, UK Centre for Atmospheric Sciences, Department of Chemistry, University of Cambridge, Cambridge, UK European Ozone Research Coordinating Unit, University...

Stratospheric ozone depletion.

Solar ultraviolet radiation creates an ozone layer in the atmosphere which in turn completely absorbs the most energetic fraction of this radiation. This process both warms the air, creating the stratosphere between 15 and 50 km altitude, and protects the biological activities at the Earth's surface from this damaging radiation. In the last half-century, the chemical mechanisms operating within...

Stratospheric Ozone Depletion

There is now strong evidence that a consequence of human activities is the inadvertent accumulation of a variety of trace gases in the earth’s atmosphere. In the past decade, these global-scale changes in the chemical composition of the atmosphere have led to a very significant depletion of the stratospheric ozone layer over Antarctica in the southern spring months and also at northern latitude...