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Tag: Radiation

Climate feedbacks - the connectivity of the positive ice/snow albedo feedback, terrestrial snow and vegetation feedbacks and the negative cloud/radiation feedback
Feedback refers to the modification of a process by changes resulting from the process itself. Positive feedbacks accelerate the process, while negative feedbacks slow it down. Part of the uncertainty around future clima...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Radiation from Chernobyl
What do the Chernobyl disaster, the Three Gorges dam in China and the spread of the Sahel have in common? In each case natural and manmade influences have forced thousands, sometimes millions of people, to leave their la...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Ground deposition of 137Cs after the Chernobyl accident
The Chernobyl nuclear accident was a devasting catastrophe with effects measurable over a huge distance. This map shows areas that have elevated levels of cesium 137 in Nordic area, in the years after the Chernobyl accid...
13 Feb 2006 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Impact of Temperature Rise on Tea in Kenya
Increasing temperatures will likely affect major crops such as tea in Kenya. Major impacts on food production will come from changes in temperature, moisture levels, ultraviolet (UV) radiation, CO2 levels, and pests and ...
17 May 2005 - by Otto Simonett, UNEP/GRID-Arendal
Cooling factors
The amount of aerosols in the air has direct effect on the amount of solar radiation hitting the Earth's surface. Aerosols may have significant local or regional impact on temperature. Water vapour is a greenhouse gas, b...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Sources of greenhouse gases
Shows the sources for greenhouse gases, contributing to climate change, and their relative radiative forcing effect (radiative forcing is the change in the balance between radiation coming into the atmosphere and radiati...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Existing radioactive waste disposal and proposal alternatives for storage
Radioactive waste presents a unique problem, where it has to be handled with care to prevent radiation exposure for people, wildlife and contamination. Products from nuclear activities can be reprocessed to a certain deg...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Norwegian emissions of SF6
SF6 is a gas that is used in circuit breakers and other switchgear as an electrical insulator. SF6 is a highly potent greenhouse gas, over 23,900 times more effective at trapping infrared radiation than carbon dioxide.
12 Feb 2006 - by Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
Radiative forcing - energy balances and the greenhouse effect
Radiative forcing is the change in the balance between radiation coming into the atmosphere and radiation going out. A positive radiative forcing tends on average to warm the surface of the Earth, and negative forcing te...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Greenhouse effect
Human activities are causing greenhouse gas levels in the atmosphere to increase. This graphic explains how solar energy is absorbed by the earth's surface, causing the earth to warm and to emit infrared radiation. The g...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Cooling factors
The amount of aerosols in the air has direct effect on the amount of solar radiation hitting the Earth's surface. Aerosols may have significant local or regional impact on temperature. Water vapour is a greenhouse gas, b...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Greenhouse effect
Human activities are causing greenhouse gas levels in the atmosphere to increase. This graphic explains how solar energy is absorbed by the earth's surface, causing the earth to warm and to emit infrared radiation. The g...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Albedo of basic thick sea ice surface types
The albedo for different surface conditions on the sea ice range widely, from roughly 85 per cent of radiation reflected for snow-covered ice to 7 per cent for open water. These two surfaces cover the range from the larg...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Schematic diagram of glacier, permafrost and forest limits as a function of mean annual air temperature and average annual precipitation
Glaciers and ice caps form around the world where snow deposited during the cold/humid season does not entirely melt during warm/dry times. This seasonal snow gradually becomes denser and transforms into perennial firn (...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Overview on glacier changes since the end of the Little Ice Age
Glaciers and ice caps reached their Holocene (the past 10 000 years) maximum extent in most mountain ranges throughout the world towards the end of the Little Ice Age, between the 17th and mid-19th century. Over the past...
01 Jun 2007 - by Hugo Ahlenius, UNEP/GRID-Arendal
Number of extra skin cancer cases related to UV radiation
The most widely recognised damage occurs to the skin. The direct effects are sun burn, chronic skin damage (photo-aging) and an increased risk of developing various types of skin cancer. Models predict that a 10 per cent...
29 Nov 2007 - by Emmanuelle Bournay, UNEP/GRID-Arendal
Effects of enhanced UV-B radiations on crops
Experiments on food crops have shown lower yields for several key crops such as rice, soy beans and sorghum. The plants minimize their exposure to UV by limiting the surface area of foliage, which in turn impairs growth....
29 Nov 2007 - by Emmanuelle Bournay, UNEP/GRID-Arendal
The global solar UV Index
The Global Solar UV Index (UVI) is a simple measurement of the UV radiation level at the Earth's surface. It has been designed to indicate the potential for adverse health effects and to encourage people to protect thems...
29 Nov 2007 - by Emmanuelle Bournay, UNEP/GRID-Arendal
Skin colour map (indigenous people)
The twin role played by the skin – protection from excessive UV radiation and absorption of enough sunlight to trigger the production of vitamin D – means that people living in the lower latitudes, close to the Equator, ...
29 Nov 2007 - by Emmanuelle Bournay, UNEP/GRID-Arendal
Greenhouse effect
Human activities are causing greenhouse gas levels in the atmosphere to increase. This graphic explains how solar energy is absorbed by the earth's surface, causing the earth to warm and to emit infrared radiation. The g...
17 May 2005 - by Philippe Rekacewicz, UNEP/GRID-Arendal
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