Tag: Air

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
Energy efficiency generally improves with economic growth...but greenhouse gases increase too
In 1992 76 million people living in urban areas were exposed to air pollutant concentrations exceeding WHO guidelines. In developing countries 1.9 million people die each year because of indoor air pollution exposure and...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Human influences on the atmosphere during the industrial era
In many of the world’s largest cities (Beijing, Calcutta, Mexico City, Rio de Janeiro, etc.) WHO World Health Organization) air quality guidelines are not met. In 1996 global emissions of carbon dioxide were nearly four ...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
Smog over Southeast Asia in 1997
In 1997 alone haze caused by air pollutants from fire spread for more than 3,200 kilometers, covering six Southeast Asian countries. In the Malaysian state of Sarawak, air pollution reached one the highest recorded indic...
29 Nov 2007 - by Philippe Rekacewicz, UNEP/GRID-Arendal
The colder Antarctic winter drives formation of the hole in the south
The air inside the Antarctic polar vortex is much colder than midlatitude air. “When temperatures drop below -78°C, thin clouds form of ice, nitric acid, and sulphuric acid mixtures. Chemical reactions on the surfaces of...
01 Oct 2007 - by Emmanuelle Bournay, UNEP/GRID-Arendal
The “Hole”: a result of special weather conditions over the pole repeated every spring
The Antarctic continent is circled by a strong wind in the stratosphere which flows around Antarctica and isolates air over Antarctica from air in the midlatitudes. The region poleward of this jet stream is called the An...
29 Nov 2007 - by Emmanuelle Bournay, UNEP/GRID-Arendal
Ozone hole size 1980–2006
The extent of ozone depletion for any given period depends on complex interaction between chemical and climatic factors such as temperature and wind. The unusually high levels of depletion in 1988, 1993 and 2002 were due...
01 Oct 2007 - by Emmanuelle Bournay, UNEP/GRID-Arendal
Methane in Air Above Water Surface
Mixing ratio of methane in the air above the water surface measured along a ship’s route in September 2005. The dotted line shows the Latitude-specific monthly average of 1.85 parts per million by volume established for ...
27 Oct 2009 - by Riccardo Pravettoni, UNEP/GRID-Arendal
Climate impacts and tropical diseases in Colombia
Shows comparative trend between air temperature in Colombia and levels of malaria and dengue fever. When temperatures increase, especially in combination with more precipitation, vector borne diseases like malaria and d...
17 May 2005 - by UNEP/GRID-Arendal
El Niño-Southern Oscillation (ENSO) Phenomenon
El Niño describes 'the warm phase of a naturally occurring sea surface temperature oscillation in the tropical Pacific Ocean', and southern oscillation refers to 'a seesaw shift in surface air pressure at Darwin, Austral...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
ENSO impact on Southern Africa
El Niño describes 'the warm phase of a naturally occurring sea surface temperature oscillation in the tropical Pacific Ocean', southern oscillation refers to 'a seesaw shift in surface air pressure at Darwin, Australia a...
17 May 2005 - by Delphine Digout, UNEP/GRID-Arendal
The boom in air travel
Number of air transport passengers per year (millions)
05 Jan 2009 - by UNEP/GRID-Arendal
Most commonly used air routes, in million passengers a year
Other options besides flight?
05 Jan 2009 - by UNEP/GRID-Arendal
Atmospheric Circulation Patterns
Carbon cycling in the world’s oceans. The flow of carbon dioxide across the air-sea interface is a function of CO2 solubility in sea water (Solubility Pump). The amount of CO2 dissolved in sea water is mainly influenced ...
06 Oct 2009 - by Giulio Frigieri
Ozone Hole Size
The extent of ozone depletion for any given period depends on complex interaction between chemical and climatic factors such as temperature and wind. The unusually high levels of depletion in 1988, 1993 and 2002 were due...
02 Nov 2009 - by Emmanuelle Bournay, UNEP/GRID-Arendal
The 'Hole': A Result of Specil Weather Conditions over the Pole Repeated Every Spring
The Antarctic continent is circled by a strong wind in the stratosphere which flows around Antarctica and isolates air over Antarctica from air in the midlatitudes.
02 Nov 2009 - by Emmanuelle Bournay, UNEP/GRID-Arendal
Migratory species – flying in the air
Acknowledging ecological networks and how their disrup-tion may have an impact populations of migratory species is essential for the survival of these species and for fostering international collaboration. This is an...
15 Nov 2011 - by Riccardo Pravettoni, UNEP/GRID-Arendal
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