Atmospheric turbidity

One of the more obvious indications of atmospheric pollution is the presence of solid or liquid particles, called aerosols, dispersed in the air. These aerosols are responsible for phenomena as diverse as the urban smogs that bedevil the world's major cities, and the spectacular sunsets which often follow major volcanic eruptions. The concentration and distribution of particulate matter in the atmosphere is closely linked to climatic conditions. Some local or regional climates encourage high aerosol concentrations, as in Los Angeles, for example, with its combination of high atmospheric pressure, light winds and abundant solar radiation. On a global scale, the mid-latitude westerlies and their associated weather systems, already implicated in the distribution of acid rain are responsible for the transportation of aerosols over long distances in the troposphere. The jet streams in the upper atmosphere are also involved in the distribution of aerosols, carrying particles around the world several times before releasing them. Knowledge of such relationships has important practical implications. At the local level, the success of pollution abatement programmes often depends upon an understanding of the impact of climate on aerosol distribution. At a continental, or even hemispheric scale, the relationship between atmospheric circulation patterns and the spread of particulate matter can be used to provide an early warning of potential problems following catastrophic events such as volcanic eruptions or nuclear accidents. In such situations, the atmospheric aerosols are responding to existing climatic conditions. There has been growing concern in recent years that they may do more than that; they may also be capable of initiating climatic change.

The Basic Survival Guide

The Basic Survival Guide

Disasters: Why No ones Really 100 Safe. This is common knowledgethat disaster is everywhere. Its in the streets, its inside your campuses, and it can even be found inside your home. The question is not whether we are safe because no one is really THAT secure anymore but whether we can do something to lessen the odds of ever becoming a victim.

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