The ozone layer, depletion and uv radiation - eco-action
Ozone layer depletion first captured the ..
The graph above shows total ozone and stratospheric temperatures over the Arctic since 1979. Changes in ozone amounts are closely linked to temperature, with colder temperatures resulting in more polar stratospheric clouds and lower ozone levels. Atmospheric motions drive the year-to-year temperature changes. The Arctic stratosphere cooled slightly since 1979, but scientists are currently unsure of the cause. Future NASA missions, starting with the Aura satellite, will improve our understanding of the links between global climate change and ozone chemistry. (Graph based on data provided by Paul Newman, NASA GSFC)
Ozone depletion is listed as one of the ..
Stratospheric cooling may have been taking place over recent decades for a number of reasons. One reason may be that the presence of ozone itself generates heat, and ozone depletion cools the stratosphere. Another contributing factor to the cooling may be that rising amounts of greenhouse gases in the lower atmosphere (troposphere) are retaining heat that would normally warm the stratosphere. However, scientists hold varying degrees of conviction about the nature of the link between tropospheric warming and stratospheric cooling. "The warming of the troposphere and its potential influence upon the stratospheric circulation is an important consideration," points out Ramaswamy, "though the quantitative linkages are uncertain. It is possible that they may be interdependent only in a tenuous manner."
physiological and developmental processes of plants are affected.
UVB is a kind of ultraviolet light from the sun (and sun lamps) that has . UVB is particularly effective at damaging DNA. It is a cause of melanoma and other types of skin cancer. It has also been linked to damage to some materials, crops, and marine organisms. The protects the Earth against most UVB coming from the sun. It is always important to protect oneself against UVB, even in the absence of , by wearing hats, sunglasses, and sunscreen. However, these precautions will become more important as ozone depletion worsens. .