Ozone Layer, a region of the atmosphere from 19 to 48 km (12 to 30 mi) above Earth’s surface. Ozone concentrations of up to 10 parts per million occur in the ozone layer. The ozone forms there by the action of sunlight on oxygen.
This action has been taking place for many millions of years, but naturally occurring nitrogen compounds in the atmosphere apparently have kept the ozone concentration at a fairly stable level.
The ozone layer of the atmosphere protects life on Earth by absorbing harmful ultraviolet radiation from the Sun.
If all the ultraviolet radiation given off by the Sun were allowed to reach the surface of Earth, most of the life on Earth’s surface would probably be destroyed. Short wavelengths of ultraviolet radiation, such as UV-A, B, and C, are damaging to the cell structure of living organisms. Fortunately, the ozone layer absorbs almost all of the short-wavelength ultraviolet radiation and much of the long-wavelength ultraviolet radiation given off by the Sun.
Ozone is a gas that occurs naturally in our atmosphere. Most of it is concentrated in the ozone layer, a region located in the stratosphere several miles above the surface of the Earth. Although ozone represents only a small fraction of the gas present in the atmosphere, it plays a vital role by shielding humans and other life from harmful ultraviolet light from the Sun. Human activities in the last several decades have produced chemicals, such as chlorofluorocarbons (CFCs), which have been released into the atmosphere and have contributed to the depletion of this important protective layer.
When scientists realized the destructive effect these chemicals could have on the ozone layer, international agreements were put in place to limit such emissions. As a result, it is expected that the ozone layer will recover in the coming decades.
Ozone is also a greenhouse gas in the upper atmosphere and, therefore, plays a role in Earth’s climate. The increases in primary greenhouse gases, such as carbon dioxide, may affect how the ozone layer recovers in coming years.
Understanding precisely how ozone abundances will change in a future with diminished chlorofluorocarbon emissions and increased emissions of greenhouse gases remains an important challenge for atmospheric scientists in NOAA and other research centers.
The Ozone Layer
Related Geography Paper:
Popular Geography Paper:
1. Introduction The twentieth century has been a century of unprecedented population growth, economic Development and environment change. From 1900 to 2000, world population grew from 1.6 Billion to 6.1 billion persons.(United nations,2001a).however , while world population increased Close to 4 t.....
Bangladesh River Pollution Buriganga It was once the lifeline of the Bangladeshi capital. But the once mighty Buriganga river, which flows by Dhaka, is now one of the most polluted rivers in Bangladesh because of rampant dumping of industrial and human waste. “Much of the Buriganga is now gone,.....
Introduction: South Asia is a region of great significance in the current world politics. Geo-strategically and Geo-economically, this region plays a vital role in the world economy. Geopolitically Bangladesh is very important in the world politics. Bangladesh also plays an important role in th.....
INTRODUCTION 1.1 GENERAL As Bangladesh is located in a tectonically active much of the country and Significant damaging historical earthquakes have occurred in and around Bangladesh. For seismic lateral force may be calculated by two methods, namely, Equivalent Static Force Method and Dynamic A.....
Introduction Natural Hazard any natural event which has an adverse socio-economic impact on the human being. Alternatively, an extreme natural event, such as a cyclone, an earthquake or a flood, that is not caused by human beings. These are naturally occurring phenomena that only become hazardou.....