An introduction to the history of the cfc chlorofluorocarbons era

Chlorofluorocarbons (CFCs)

It is then released again in the fall and winter as the plants decompose. Unlike the Chapman reactions, reactions with trace chemicals like ions or simple molecules of chlorine, bromine, and fluorine results in rapid one-way depletion of ozone.

In stage I, there was little consensus among the principal actors on the nature and scope of the problem; in stage II, based on strong scientific evidence, consensus on the nature and scope of the problem was reached.

Hampson, supra note 4, at xi. Research also suggests that increased UV-B radiation could result in decreased crop production,12 and change in the species composition of natural aquatic ecosystems resulting in more unstable ecosystems.

The pre-industrial concentration of greenhouse gases was chemically balanced to allow global cooling at a rate that maintained temperatures within an acceptable temperature range. At first they believed their instruments to be faulty, and new instruments were sent to ensure that the readings were accurate.

SST program in Ultraviolet light then breaks the O3 molecules back into O2 and oxygen atoms by photodissociation. Over the next three decades, CFCs that were given off by the various products dissipated into the atmosphere.

It is released as part of the biological processes in low oxygen environments, such as in swamplands or in rice production at the roots of the plants.

The beginning of the CFC(chlorofluorocarbons)

In other words, the risks associated with ozone depletion are high in dread, low in familiarity, and high in exposure. Atmospheric scientists also observed an Arctic ozone hole, but it was smaller, more variable, and less depleted than its southern hemisphere counterpart. While gases such as carbon dioxide occur naturally in the atmosphere, through our interference with the carbon cycle through burning forest lands, or mining and burning coalwe artificially move carbon from solid storage to its gaseous state, thereby increasing atmospheric concentrations.

Two thirds of the over types of plants tested became known to be sensitive to UV-B. However Rowland and Molina did a marvelous job of defending their results and explaining the significance of these dangerous CFCs to other scientists, government officials, and the press.

Direct atmospheric measurement of atmospheric methane has been possible since the late s and its concentration rose from 1. These organisms fed off atmospheric carbon dioxide and converted much of it into marine sediments consisting of the innumerable shells and decomposed remnants of sea creatures.

One wavelength is more strongly absorbed by ozone than the other wavelength. The Montreal Protocol is a landmark agreement in that it is the first international treaty for mitigating a global atmospheric problem before serious environmental impacts have been conclusively detected.

Destruction of these phytoplanktons would give serious problems to fishes which depend on these small creatures for food, and eventually effect humans. The build up of oxygen had three major consequences that we should note here.

As a powerful symbol of the potential impacts from stratospheric ozone depletion, the ozone hole galvanized world opinion, and thus influenced the outcome in Montreal.

Ozone Hole

It was clear that the amount of ozone in the Northern Hemisphere stratosphere fell by 8 percent between andacross a region that covers virtually all of the contiguous Untied States and Europe from the Mediterranean to the south of England. In addition, European governments were being pressured by their own environmental groups, and the EEC countries, as well as Japan, feared that if there was no international agreement, the United States might take unilateral action and impose trade sanctions.

Nitrous Oxide Concentrations of nitrous oxide also began to rise at the beginning of the industrial revolution and is understood to be produced by microbial processes in soil and water, including those reactions which occur in fertilizer containing nitrogen.Anthropogenic Chlorofluorocarbons in the Black Sea and the Sea of Marmara Bing-Sun Lee E-mail: [email protected] Introduction The Black Sea (Fig.

1) is the world's largest anoxic basin.


A low salinity upper A reconstruction of the CFC atmospheric history for the period. spheric ozone in the post-chlorofluorocarbon (CFC) era are investigated using simulations of the recent past and the 21st century with a coupled chemistry-climate model.

In the mid nineteen-eighties the world recognized that CFC refrigerants, once considered safe for Thomas Midgely developed the first CFC (Chlorofluorocarbons), R CFCs were non- centrifugal chiller for commercial use and the era of refrigeration and air conditioning began.

For technical reasons that will be discussed later, several. Global Warming and Chlorofluorocarbons (CFCs) Chlorofluorocarbons (CFC’s) are a man-made substance that did not previously exist to the industrial area. Global Warming and Acid Rain INTRODUCTION The phrase Global Warming has become familiar to many people as one of the important environmental issues of our day.

Many. For example, CFC has an atmospheric lifetime of 60 years, CFC years, CFC 90 years, and CFC years. The atmospheric concentration of total CFCs in the early s was about ppb (parts per billion), and was increasing about 5 to 6% per year.

CFCs and the Environment: Further Observations INTRODUCTION The introduction of the chlorofluorocarbon (CFC) fluids in the early thirties marked the inception of the organofluorocarbon industry.

potential to deplete stratospheric ozone relative to that of CFC-II. REFRIGERATION The history of commercial refrigeration can be.

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An introduction to the history of the cfc chlorofluorocarbons era
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