And we now have a gloomier picture of the extent to which smogs and other human -
made aerosols in the atmosphere shade us from the worst of global warming.
Not exact matches
Climate change is likely to influence rainfall patterns
in the Sierra Nevada as well as the amount of dust that
makes its way into the
atmosphere, so the hope is that a better understanding of how
aerosols affect precipitation will help water managers
in the future.
Although the ions are not the most numerous constituents
in the
atmosphere the electro - magnetic interactions between ions and
aerosols compensate for the scarcity and
make fusion between ions and
aerosols much more likely.
Water vapor condenses around
aerosols in the
atmosphere, creating droplets that
make up clouds.
For decades, scientists have been studying how the chemical
make - up of
aerosols affects their ability to take up water, seed clouds, and react
in the
atmosphere.
The complexity of various physical and chemical processes
in the
atmosphere makes it very difficult to identify sources of these carbon - containing
aerosols.
The PNNL study measured how,
in the
atmosphere, these
aerosols interact with and mix with other volatile or semi-volatile organic compounds, the carbon - centric chemicals that evaporate from both natural and human -
made sources.
Volcanic events and some types of human -
made pollution, both of which inject sunlight - reflecting
aerosols (i.e., tiny particles) into the
atmosphere, lower temperature and are examples of forcings that drive decreases
in temperature.
In the case of adding
aerosols to the
atmosphere - it does not
make sense to do so because we do not know that the benefits will outweigh the potential harms.
a) decreases («dimming») until the 1980s, because atmospheric pollutants (
aerosols)
make the
atmosphere more reflective and also clouds, by increasing the number of water droplets
in the clouds, which
in turn increases the amount of sunlight reflected, and subsequent
Scientists believe that the combination of growing quantities of man -
made aerosol particles
in the
atmosphere and more moisture have caused the cloud cover to thicken.
Turner's work,
in particular, which often depicts brightly colored sunsets and emphasized natural light, can be used to roughly estimate
aerosol optical depth — that is, the amount of particles like dust, volcanic ash, smoke and sea salts
in the
atmosphere — at the time the painting was
made.
For example, the harmful haze you see and breathe
in big cities like Los Angeles or Philadelphia is
made of «
aerosols,» a name for various kinds of tiny particles
in the
atmosphere.
I was at an international conference on
aerosol in September and I
made a comment that we're getting to the stage with CLOUD where we will understand the processes extremely well, but we still won't be able to reduce the errors because we don't have good enough atmospheric observations of what the concentrations of these vapors are
in the
atmosphere versus altitude.
They are referring to a 1971 article written by climatologist Stephen Schneider,
in which he did, indeed,
make that prediction; however, as he himself now acknowledges, new evidence soon followed its publication that suggested that 1) the cooling impact of
aerosols was not nearly as high as originally estimated and 2) there were many other gases
in the
atmosphere, including methane, CFCs and ozone, that had the same warming effect as carbon dioxide.
I think it is really important to
make that distinction - that there are a number of factors that influence the extent of Arctic sea ice, some of them of course associated with changes
in the radiative forcing from the
atmosphere, as a result of anthropogenic greenhouse gases and
aerosols, but also changes
in the atmospheric circulation and also the advection of heat into or out of the Arctic by the ocean circulation.
«Geoengineering for global warming: Increasing
aerosols in atmosphere would
make sky whiter.»
The climate feedbacks involved with these changes, which are key
in understanding the climate system as a whole, include: + the importance of aerosol absorption on climate + the impact of aerosol deposition which affects biology and, hence, emissions of aerosols and aerosol precursors via organic nitrogen, organic phosphorus and iron fertilization + the importance of land use and land use changes on natural and anthropogenic aerosol sources + the SOA sources and impact on climate, with special attention on the impact human activities have on natural SOA formation In order to quantitatively answer such questions I perform simulations of the past, present and future atmospheres, and make comparisons with measurements and remote sensing data, all of which help understand, evaluate and improve the model's parameterizations and performance, and our understanding of the Earth syste
in understanding the climate system as a whole, include: + the importance of
aerosol absorption on climate + the impact of
aerosol deposition which affects biology and, hence, emissions of
aerosols and
aerosol precursors via organic nitrogen, organic phosphorus and iron fertilization + the importance of land use and land use changes on natural and anthropogenic
aerosol sources + the SOA sources and impact on climate, with special attention on the impact human activities have on natural SOA formation
In order to quantitatively answer such questions I perform simulations of the past, present and future atmospheres, and make comparisons with measurements and remote sensing data, all of which help understand, evaluate and improve the model's parameterizations and performance, and our understanding of the Earth syste
In order to quantitatively answer such questions I perform simulations of the past, present and future
atmospheres, and
make comparisons with measurements and remote sensing data, all of which help understand, evaluate and improve the model's parameterizations and performance, and our understanding of the Earth system.