The rest of the dust in the atmosphere comes from other regions, including the Taklimakan Desert in China, Iran, the shore of the Caspian Sea, and some parts of Arabia. Of course, there are many more places that are capable of producing dust, but these are some of the biggest ones. Atmospheric dust is quite important for the climate of our planet. Atmospheric dust affects many aspects of our planet and it's ecosystems.
Even though it is not impossible to capture the image of dust via satellites, it is still extremely difficult. Lake Chad located in the Sahara is one of the most important surces of atmospheric dust. Puma, Cougar, Or Mountain Lion? Bhopal Gas Tragedy. Clilinaction CLIL will no longer be a secret with"clil in action"! Smartenglish Improve your English with Smartenglish! Scienze in classe Studying physics, biology, earth science and chemistry has never been so stimulating!
Scienze in classe. International projects Projects involving students from around the world, of different ages, which allow students to learn new content and release their energy, through participation and discussion. Lab 4 energy A virtual thematic classroom, high school students linked from various parts of the world for 15 courses on the world of energy, organised by faculty of MIT in Boston and world-renowned experts.
Lab 4 energy. Necst We are a partner of the NECST project , the European Union programme that connects schools in Croatia, Holland, Norway and Italy in the creation of a digital platform for research and exchange of knowledge on energy production.
Schoolnet A storyboard full of texts and drawings to narrate one's country in an original manner: letting loose the imagination of children around the world in the edition. What it is Pollutants and their effects Atmospheric dust Benzene Acid deposits Ozone Photochemical pollution Improving air quality What it is Pollutants and their effects Improving air quality.
Download " Pollutants and their effects " pdf file. Download the junior version pdf file. Special reports. The findings appear in the journal Science Advances. The National Science Foundation -funded researchers found that Earth's atmosphere contains 17 million metric tons of coarse dust -- the equivalent of 17 million elephants, or the mass of every person in America, put together. Adebiyi worked with Jasper Kok, a UCLA atmospheric and ocean scientist, to determine the actual amount of coarse dust in the atmosphere by analyzing dozens of published aircraft-based observations, including recent measurements taken over the Sahara Desert, and comparing those with widely used global atmospheric model simulations.
By plugging this amount of missing coarse dust into models, Adebiyi said, it increases the likelihood that the net amount of dust overall -- both fine and coarse -- is warming rather than cooling the Earth's climate system, from air to oceans. Coarse dust particles warm Earth's climate by absorbing both incoming radiation from the sun and outgoing radiation from Earth's surface. In response, scientists have tried to take advantage of the technological advances in satellite instrumentation to create different types of satellite imagery to overcome this dust-detection difficulty.
In these so-called "false-color" images, such as in the one of China's Taklimakan Desert, dust clouds show up quite clearly, even over lighter areas. Unfortunately, these types of images are only available in the daytime, which presents a problem for scientists trying to track the development and distribution of atmospheric dust clouds over time.
Taking a different approach, the scientists at the European Organization for the Exploitation of Meteorological Satellites EUMETSAT have developed a method of processing satellite imagery specifically designed to aid the detection of atmospheric dust.
Aptly named " Dust RGB ," and available both day and night, this method combines three of a satellite imager's red, green and blue channels so that dust clouds appear pink or red depending on the time of day the image was produced. Nevertheless, even though this type of imagery allows analysts to detect low-level dust clouds at night, they may still be difficult to see in Dust RGB images because of the small amount of contrast between dust clouds and terrestrial areas.
As its name implies, DEBRA works by reducing the background in an image be it a polar-orbiting or geostationary satellite to grayscale, thereby enhancing the appearance of dust clouds, which appear yellow.
The intensity of the yellow corresponds to confidence that a given pixel contains dust. These improved spectral and temporal attributes will greatly improve dust detection and characterization. Improving our ability to detect dust in the atmosphere is beneficial because just how much dust enters the atmosphere each year is unclear - projections range from to 5, teragrams a year a teragram, Tg, equals one trillion grams.
0コメント