The bottom map
shows aerosol emissions from ships crossing routes in the Indian Ocean and South China sea from 2010.
Not exact matches
Simulating natural and humanmade climate drivers, scientists
showed that the decline in rainfall is primarily a response to humanmade increases in greenhouse gases as well as a thinning of the ozone caused by humanmade
aerosol emissions.
The study also
showed that the effect was much larger on a regional scale, counteracting possibly up to 30 % of warming in more rural, forested areas where anthropogenic
emissions of
aerosols were much lower in comparison to the natural
aerosols.
The results
show for the first time for a number of natural compounds, which together account for around 70 per cent of the biological hydrocarbon
emissions, how much each compound produces low - volatility products and how they can possibly affect the climate via producing
aerosol particles.
Analyses of the ground and aircraft data performed by Setyan et al. (2012), Shilling et al. (2013), and Kleinman et al. (2016)
showed that organic
aerosol production increased when human - caused
emissions from Sacramento mixed with air rich in isoprene, an organic compound wafting from many plants that originate in the area's foothills.
Here we
show the climate impacts from removing present - day anthropogenic
aerosol emissions and compare them to the impacts from moderate GHG - dominated global warming.
The declining signal over India
shown by the GPCP decadal mode is broadly consistent with gauge measurements since the 1950s — that several research groups including my own are trying to understand, perhaps relating to
emissions of anthropogenic
aerosol — although there are discrepancies between these gauge - based data sets themselves (see our recent review in Nature Climate Change, for example).
The IPCC model projections of future warming based on the varios SRES and human
emissions only (both GHG warming and
aerosol cooling, but no natural influences) are
shown in Figure 6.
Contribution from working group I to the fifth assessment report by IPCC TS.5.4.1 Projected Near - term Changes in Climate Projections of near - term climate
show small sensitivity to Green House Gas scenarios compared to model spread, but substantial sensitivity to uncertainties in
aerosol emissions, especially on regional scales and for hydrological cycle variables.
Rising population and over-grazing by livestock was the first theory but studies now
show the drought resulted from changes in ocean surface temperatures Folland et al (1986) Giannini et al (2003) which are likely due in part to the sulphate
aerosol pollution of Europe and North America Rotstayn & Lohmann (2002) Biasutti & Gainnini (2006) and thus it is the cleaning of
emissions from power stations that has likely allowed the rains to return.
This result
shows, for 160 years, the GMT pattern (the climate) has not been affected by human CO2
emission, volcanoes and
aerosols!
The study also
showed that the effect was much larger on a regional scale, counteracting possibly up to 30 % of warming in more rural, forested areas where anthropogenic
emissions of
aerosols were much lower in comparison to the natural
aerosols.