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Aerosol biography, Aerosol discography
In contrast, aerosol refers to particles and the gas together.Sources of particulate matter can be man made or natural.Human activities, such as the burning of fossil fuels in vehicles, power plants and various industrial processes also generate significant amounts of aerosols.Scale classification
2 Sources
3 Composition
4 Removal processes
5 Radiative forcing from aerosols
5.Health effects
7 Regulation
7.Scale classification
Among the most common categorizations imposed on particulates are those with respect to size, referred to as fractions.Asbestos fibers), there are many definitions of particle size.These dimensions represent the continuum from a few molecules up to the size where particles can no longer be carried by a gas.These are the formal definitions.In some specialized settings, each fraction may exclude the fractions of lesser scale, so that PM10 excludes particles in a smaller size range, e.This is useful when not only the upper bound of a fraction is relevant to a discussion.Sea spray is also a large source of particles though most of these fall back to the ocean close to where they were emitted.Even if the California standard were introduced worldwide, says Jacobson, diesel cars may still warm the climate more than gasoline cars over 13 to 54 years.Composition
The composition of aerosol particles depends on their source.In addition, sea spray aerosols may contain organic compounds, which influence their chemistry.Secondary particles derive from the oxidation of primary gases such as sulfur and nitrogen oxides into sulfuric acid (liquid) and nitric acid (gaseous).In the presence of ammonia, secondary aerosols often take the form of ammonium salts; i.This is mainly because the presence of sulfate and nitrate causes the aerosols to increase to a size that scatters light effectively.Organic matter and elemental carbon together constitute the carbonaceous fraction of aerosols.The chemical composition of the aerosol directly affects how it interacts with solar radiation.The chemical constituents within the aerosol change the overall refractive index.Aerosols, natural and anthropogenic, can affect the climate by changing the way radiation is transmitted through the atmosphere.Direct observations of the effects of aerosols are quite limited so any attempt to estimate their global effect necessarily involves the use of computer models.Sulfate aerosol
Sulfate aerosol has two main effects, direct and indirect.The effect varies strongly geographically, with most cooling believed to be at and downwind of major industrial centres.Black carbon
Black carbon (BC), or Carbon Black, or Elemental Carbon (EC), often called soot, is composed of pure carbon clusters, skeleton balls and buckyballs, and is one of the most important absorbing aerosol species in the atmosphere.It should be distinguished from Organic Carbon (OC): clustered or aggregated organic molecules on their own or permeating an EC buckyball.All aerosols both absorb and scatter solar and terrestrial radiation.If a substance absorbs a significant amount of radiation, as well as scattering, we call it absorbing.This is quantified in the Single Scattering Albedo (SSA), the ratio of scattering alone to scattering plus absorption (extinction) of radiation by a particle.The SSA tends to unity if scattering dominates, with relatively little absorption, and decreases as absorption increases, becoming zero for infinite absorption.The size of the particle is a main determinant of where in the respiratory tract the particle will come to rest when inhaled.Similarly, particles smaller than 2.In particular, a study published in the Journal of the American Medical Association indicates that PM2.The smallest particles, less than 100 nanometers (nanoparticles), may be even more damaging to the cardiovascular system.In addition, these soot particles also carry carcinogenic components like benzopyrenes adsorbed on their surface.The examples and perspective in this article or section may not represent a worldwide view of the subject.Please improve this article or discuss the issue on the talk page.Many urban areas in the U.Europe still frequently violate the particulate standards, though urban air on these continents has become cleaner, on average, with respect to particulates over the last quarter of the 20th century.United States
The United States Environmental Protection Agency (EPA) sets standards for PM10 and PM2.See National Ambient Air Quality Standards.The most concentrated particulate matter pollution tends to be in densely populated metropolitan areas in developing countries.Aerosol science
The field of aerosol science and technology has grown in response to the need to understand and control natural and manmade aerosols."Terms of Environment: Glossary, Abbreviations and Acronyms; ".Akademie der Wissenschaften, ISBN 3700129157 (pbk.Particulate matter from tobacco versus diesel car exhaust: an educational perspective.Look up Particulate in
Wiktionary, the free dictionary.Wide Standards
Little Green Data Book 2007, World Bank.This page was last modified on 7 May 2008, at 09:19.All text is available under the terms of the GNU Free Documentation License.Mary Hardin and Ralph
Kahn Aerosols are tiny particles suspended in the air.Some occur
naturally, originating from volcanoes, dust storms, forest and grassland fires, living
vegetation, and sea spray.Human activities, such as the burning of fossil fuels
and the alteration of natural surface cover, also generate aerosols.Averaged
over the globe, aerosols made by human activities currently account for about 10
percent of the total amount of aerosols in our atmosphere.Scientists have much to learn about the way aerosols affect regional and global
climate.We have yet to accurately quantify the relative impacts on climate of natural
aerosols and those of human origin.Moreover, we do not know in what
regions of the planet the amount of atmospheric aerosol is increasing,
is diminishing, and is remaining roughly constant.Overall, we are
even unsure whether aerosols are warming or cooling our planet.Climate Change
Why do we care about aerosols?Every Cloud has a Filthy Lining
How the aerosols created by
ship exhaust changes the structure of clouds.Aerosol particles larger than about 1 micrometer in size are produced by
windblown dust and sea salt from sea spray and bursting bubbles.Aerosols smaller
than 1 micrometer are mostly formed by condensation processes such as conversion
of sulfur dioxide (SO2) gas (released from volcanic eruptions) to sulfate
particles and by formation of soot and smoke during burning processes.Why do we care
about aerosols?Aerosols tend to cause cooling of the Earth's surface
immediately below them.Because most aerosols reflect sunlight back into space,
they have a "direct" cooling effect by reducing the amount of solar radiation
that reaches the surface.The magnitude of this cooling effect depends on the
size and composition of the aerosol particles, as well as the reflective
properties of the underlying surface.It is thought that aerosol cooling may
partially offset expected global warming that is attributed to increases in the
amount of carbon dioxide from human activity.Clouds with low aerosol concentration and a few large droplets do not scatter light well, and
allow much of the Sun's light to pass through and reach the surface.The high aerosol concentrations in these clouds provide
the nucleation points necessary for the formation of many small liquid water
droplets.Aerosols are also believed to have an "indirect" effect on climate by changing
properties of clouds.Indeed, if there were no aerosols in the atmosphere,
there would be no clouds.It is very difficult to form clouds
without small aerosol particles acting as "seeds" to start the formation of
cloud droplets.As aerosol concentration increases within a cloud, the water in the
cloud gets spread over many more particles, each of which is correspondingly smaller.In this way, changing aerosols in the atmosphere can change the frequency of cloud
occurence, cloud thickness, and rainfall amounts.If there are more aerosols, scientists expect more cloud drops to form.Privacy Policy and Important Notices
Responsible NASA Official: Lorraine A.Note: some videos not suitable for minors may still appear in search results.Try the New YouTube Player Beta!Thank you for sharing this video!Please login to add to favorites.The video has been added to your playlist.This video has no Responses.Change this to see only comments above a certain value.Change the value of a comment by clicking on a thumb.Here in Estonia there has also been a huge increase in chemtrail spraying.The Shield Project, wonder if it's real?Nice, I've caught this too, just recently.Plus, technology has advanced beyond needing billions of people on this planet.El avion que tiene la pansa roja en mi provincia ay otro igual fumigando.The inward vortices can't be avoided, nor their direction changed.They are caused by any lifting surface.However, the spinning disperses the vapor over time very effectively.The vortices of the lower aircraft vanished after about 20 seconds, but the chemical vapor lasted for well over 4 hours.There is something very wrong in our skies!!!!"Top Extra Secret Underground Alien Bases.CONSPIRACY: A CONTROLLED DEMOLITION DESTROYED THE WTC!!"CONSPIRACY: A CONTROLLED DEMOLITION DESTROYED THE WTC!!"YouTube recommends upgrading to a safer, modern browsersuch as Firefox.This documentary produced by chemtrail researcher Clifford Carnicom is a must see and an excellent research tool.Save file to your computer.Fchemtrail research has provided some leads but even more questions as to who and why the spraying occurs.Try holding the Shift key and clicking on the bookmarklet again.Please check your connection and try again.The American Association for Aerosol Research (AAAR) is a nonprofit professional organization for scientists and engineers who wish to promote and communicate technical advances in the field of aerosol research.Aerosols are minute particles suspended in the atmosphere.Aerosols interact both directly and indirectly with the Earth's radiation budget
and climate.As a direct effect, the aerosols scatter sunlight directly back
into space.Aerosols also can act as sites for chemical reactions to take place (heterogeneous
chemistry).During winter in the polar regions, aerosols
grow to form polar stratospheric clouds.Pinatubo in 1991, where tons of volcanic aerosols are blown
into the atmosphere (Fig.The dispersal of volcanic aerosols has a drastic effect on the Earth's
atmosphere.Following an eruption, large amounts of sulphur dioxide (SO2), hydrochloric
acid (HCL) and ash are spewed into the Earth's stratosphere.Sulphur dioxide from the cloud is transformed into sulphuric
acid (H2SO4).The sulphuric acid quickly condenses, producing aerosol particles
which linger in the atmosphere for long periods of time.Volcanic Aerosol
Three types of aerosols significantly affect the Earth's climate.Once formed, these aerosols stay in the stratosphere for about two years.II) have enabled scientists to better understand the effects of volcanic
aerosols on our atmosphere.Desert Dust
The second type of aerosol that may have a significant effect on climate is
desert dust.Pictures from weather satellites often reveal dust veils streaming
out over the Atlantic Ocean from the deserts of North Africa.The particles in these dust
plumes are minute grains of dirt blown from the desert surface.Through absorption of sunlight, the dust particles warm
the layer of the atmosphere where they reside.Through the suppression of storm clouds
and their consequent rain, the dust veil is believed to further desert expansion.Recent observations of some clouds indicate that they may be absorbing more
sunlight than was thought possible.Made Aerosol
The third type of aerosol comes from human activities.The concentration of aerosols is highest in the northern hemisphere
where industrial activity is centered.The sulfate aerosols also enter clouds where they cause the number of cloud
droplets to increase but make the droplet sizes smaller.Aerosols As Atmospheric Tracers
Aerosol measurements can also be used as tracers to study how the Earth's atmosphere
moves.Future NASA Aerosol Studies
NASA's ongoing Atmospheric Effects of Aviation Project (AEAP)
has measured emissions from the engines of several commercial and research aircraft.Few actual measurements of their effects have been made,
however.Study (SUCCESS) focused on subsonic aircraft contrails and the impact of the
aerosols in those contrails on cirrus clouds and atmospheric chemistry.Studies like SUCCESS and AEAP will be ongoing as scientists continue
to try to understand how aerosols affect our atmosphere and climate.Ever wonder how an aerosol can works or how light sticks work?You've probably never heard of Eric Rotheim, but you're undoubtedly familiar with his work.The technology has evolved somewhat over the years, but the illustrations in Rotheim's 1931 U.Initially, Rotheim's innovation didn't have much of an impact on the world.It wasn't until World War II, when the U.Share This Article: (what's this?What is in an antiperspirant that stops sweat?For Mac Firefox we have to add this kludge to prevent our scrollbar from
bleeding through to the other layers of the TabBox.For a definition of aerosol index,
click here.
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