Sentences with phrase «increasing aerosols in atmosphere»

«Geoengineering for global warming: Increasing aerosols in atmosphere would make sky whiter.»

Not exact matches

China «could cause some decreases [in stratospheric aerosols] if that is the source,» Neely says, adding that growing SO2 emissions from India could also increase cooling if humans are the dominant cause of injecting aerosols into the atmosphere.

Black carbon aerosols — particles of carbon that rise into the atmosphere when biomass, agricultural waste, and fossil fuels are burned in an incomplete way — are important for understanding climate change, as they absorb sunlight, leading to higher atmospheric temperatures, and can also coat Arctic snow with a darker layer, reducing its reflectivity and leading to increased melting.

A few of the main points of the third assessment report issued in 2001 include: An increasing body of observations gives a collective picture of a warming world and other changes in the climate system; emissions of greenhouse gases and aerosols due to human activities continue to alter the atmosphere in ways that are expected to affect the climate; confidence in the ability of models to project future climate has increased; and there is new and stronger evidence that most of the warming observed over the last 50 years is attributable to human activities.

Burning fossil fuels increases aerosol concentrations in the atmosphere.

«The trends in Africa of hot summers getting hotter and rainy seasons drying out are linked with factors that include increasing greenhouse gases and aerosols in the atmosphere,» said Ming Cai, a program director in the National Science Foundation's Division of Atmospheric and Geospace Sciences, which funded the research.

Indeed, conventional wisdom held that higher levels of aerosol pollution in the atmosphere should cool the earth's climate because aerosols can increase cloudiness; they not only reduce precipitation, which raises the water content in clouds, but they also increase the size of the individual water droplets, which in turn causes more warming sunlight to be reflected back into space.

And while researchers are still striving to fully understand the health and environmental impact of increased levels of secondary organic aerosols in the atmosphere, studies have linked exposure to outdoor aerosols generally to morbidity and mortality outcomes.

For example, they predicted the expansion of the Hadley cells, the poleward movement of storm tracks, the rising of the tropopause, the rising of the effective radiating altitude, the circulation of aerosols in the atmosphere, the modelling of the transmission of radiation through the atmosphere, the clear sky super greenhouse effect that results from increased water vapor in the tropics, the near constancy of relative humidity, and polar amplification, the cooling of the stratosphere while the troposphere warmed.

GHG continue to increase in amounts in the atmosphere and as such, over time more warming inevitably continues though there may be breaks for short periods, and some cooling, as already discussed at great length regarding aerosols.

Satheesh and Ramanathan [2000] infer from satellite and surface measurements that aerosol heating in the lower atmosphere over the northern Indian Ocean at local noon is 1 - 3 K / day, an increase of 50 - 100 % over aerosol - free solar heating.»

Ideas that we should increase aerosol emissions to counteract global warming have been described as a «Faustian bargain» because that would imply an ever increasing amount of emissions in order to match the accumulated GHG in the atmosphere, with ever increasing monetary and health costs.

This is the portion of temperature change that is imposed on the ocean - atmosphere - land system from the outside and it includes contributions from anthropogenic increases in greenhouse gasses, aerosols, and land - use change as well as changes in solar radiation and volcanic aerosols.

The fact that the global temperature has remained unchanged for a decade requires that the quantity of reflecting aerosols dumped put in our atmosphere must be increasing year on year at precisely the exact rate needed to offset the accumulating carbon dioxide that wants to drive the temperature higher.

On the question of hurricanes, the theoretical arguments that more energy and water vapor in the atmosphere should lead to stronger storms are really sound (after all, storm intensity increases going from pole toward equator), but determining precisely how human influences (so including GHGs [greenhouse gases] and aerosols, and land cover change) should be changing hurricanes in a system where there are natural external (solar and volcanoes) and internal (e.g., ENSO, NAO [El Nino - Southern Oscillation, North Atlantic Oscillation]-RRB- influences is quite problematic — our climate models are just not good enough yet to carry out the types of sensitivity tests that have been done using limited area hurricane models run for relatively short times.

Causes, and they are multiple, appear to be: 1) Natural variability of ocean to atmosphere sensible and latent heat flux 2) Modest increase in natural volcanic aerosols 3) Slight decrease in solar output

Yet, over rapidly developing countries such as China and India, significant increasing trends in AOD are seen in these source regions and their surrounding downwind oceans, particularly during the dry winter / postmonsoon months when the atmosphere is relatively stable, thus favoring accumulation of aerosols.

In times when the oceans are warming, there could be several factors that influence this, each with varying contributions based on natural and / or anthropogenic variability: 1) Greater solar output 2) Less aerosols in the atmosphere 3) Less cloudiness (especially of a certain type) 4) Increased greenhouse gasIn times when the oceans are warming, there could be several factors that influence this, each with varying contributions based on natural and / or anthropogenic variability: 1) Greater solar output 2) Less aerosols in the atmosphere 3) Less cloudiness (especially of a certain type) 4) Increased greenhouse gasin the atmosphere 3) Less cloudiness (especially of a certain type) 4) Increased greenhouse gases

Dirt particles in the atmosphere, especially sulphate aerosols, have created a certain cooling effect and has prevented a stronger temperature increase at the moment.

One idea for fighting global warming is to increase the amount of aerosols in the atmosphere, scattering incoming solar energy away from the Earth's surface.

7.4.5 Impact of Cosmic Rays on Aerosols and Clouds 43 44 High solar acti0vity leads to variations in the strength and three - dimensional structure of the heliosphere, 45 which reduces the flux of galactic cosmic rays (GCR) impinging upon the Earth's atmosphere by increasing 46 the deflection of low energy GCR.

In particular, increases in the number of small particles (called aerosols) in the atmosphere regionally offset and mask the greenhouse effect, and stratospheric ozone depletion contributes to cooling of the upper troposphere and stratosphere.fr2], frIn particular, increases in the number of small particles (called aerosols) in the atmosphere regionally offset and mask the greenhouse effect, and stratospheric ozone depletion contributes to cooling of the upper troposphere and stratosphere.fr2], frin the number of small particles (called aerosols) in the atmosphere regionally offset and mask the greenhouse effect, and stratospheric ozone depletion contributes to cooling of the upper troposphere and stratosphere.fr2], frin the atmosphere regionally offset and mask the greenhouse effect, and stratospheric ozone depletion contributes to cooling of the upper troposphere and stratosphere.fr2], fr3]

Dennie: I am slowly coming to the realization that the planet is heating up not only from greenhouse gasses and aerosol particulates holding in heat, but that the major cause of the increased atmospheric heat is due to microwave technology and the exponential increase in its saturation of the entire global atmosphere.

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 observed an increase in these sun - scattering aerosols in the atmosphere from 2000 to 2010.

The results suggested that moderate volcanic eruptions were behind the increases of aerosols in the atmosphere.

Effects on the global temperature of large increases in carbon dioxide and aerosol densities in the atmosphere of Earth have been computed.

The data and the statistical analysis does not provide the evidence that the so called «pause», a time period with a lower trend estimate than the longer - term trend estimate, was more than just a short - term fluctuation around the median warming trend, mostly due to short - term unforced internal variability in the Earth system (and some contribution from decreasing solar activity and increased reflecting aerosols in the atmosphere, counteracting the increased greenhose gas forcing to some degree), like the «acceleration» over the 16 - year period from 1992 to 2007 (e.g., UAH trend: 0.296 + / - 0.213 (2 sigma) deg.

Natural Variability Doesn't Account for Observed Temperature Increase In it's press release announcement, NASA points out that while there are other factors than greenhouse gases contributing to the amount of warming observed — changes in the sun's irradiance, oscillations of sea surface temperatures in the tropics, changes in aerosol levels in the atmosphere — these factors are not sufficient to account for the temperature increases observed since 188In it's press release announcement, NASA points out that while there are other factors than greenhouse gases contributing to the amount of warming observed — changes in the sun's irradiance, oscillations of sea surface temperatures in the tropics, changes in aerosol levels in the atmosphere — these factors are not sufficient to account for the temperature increases observed since 188in the sun's irradiance, oscillations of sea surface temperatures in the tropics, changes in aerosol levels in the atmosphere — these factors are not sufficient to account for the temperature increases observed since 188in the tropics, changes in aerosol levels in the atmosphere — these factors are not sufficient to account for the temperature increases observed since 188in aerosol levels in the atmosphere — these factors are not sufficient to account for the temperature increases observed since 188in the atmosphere — these factors are not sufficient to account for the temperature increases observed since 1880.

This temperature plateau is very likely due to increased levels of particulates (or «aerosols») in the atmosphere reflecting solar radiation back into space.

One idea for fighting global warming is to increase the amount of aerosols in the atmosphere, scattering incoming solar energy away from Earth's surface.

S. Ichtiaque Rasool and Stephen Schneider of NASA, for example, modelled the effects of pollution in the form of aerosols and sulphur emissions in the atmosphere and discovered that a significant increase of such pollution could - possibly - lead to a cooling episode.

Their model found that the unprecedented increase in monsoon activity over the past 30 years is «due possibly in part to» the rise of CO2 in the atmosphere, but they said the result could be an overestimate because the authors didn't consider the impacts of aerosols, which cool the atmosphere.

The increased CO2 will behave exactly the same regardless of the levels of aerosols in the atmosphere, changing the energy balance and warming the planet.

You claim chinas temperatures have continued to increase recently despite their coal burning and sulphate aerosols, with no basic knowledge that 1) they have filters on the power stations to remove most particulate matter like this since the 1980's, and 2) CO2 accumulates in the atmosphere overwhelming particulates, which are short lived in the atmosphere.

The new study, published in Nature Geoscience, identified a negative feedback loop in which higher temperatures lead to an increase in concentrations of natural aerosols that have a cooling effect on the atmosphere.

Updates in Trenberth et al. (2009) included revised absorption in the atmosphere by water vapor and aerosols, since Kim and Ramanathan (2008) found that updated spectroscopic parameters and continuum absorption for water vapor increased the absorption by 4 — 6 W m − 2.