Tar sands study co-author Shao - Meng Li, a senior research scientist at Environment and Climate Change Canada, said that in highly - polluted regions,
some organic aerosols can prevent clouds from forming.
Not exact matches
Carbonaceous PM is made up of black carbon, primary
organic aerosol (POA) and, especially, secondary
organic aerosol (SOA), which is known to contain harmful reactive oxygen species and
can damage lung tissue.
This provides a new insight into the conventional belief that tree leaves are the primary source of
organic gases and
aerosols which
can affect the cloud formation.
A study published April 7 in PNAS Online Early Edition describes how a team of scientists, including researchers from the University of California, Davis, showed that vapor losses to the walls of laboratory chambers
can suppress the formation of secondary
organic aerosol, which in turn has contributed to the underprediction of SOA in climate and air quality models.
The cooling effect of
aerosols can partly offset global warming on a short - term basis, but many are made of
organic material that comes from sources that scientists don't fully understand, said Joost de Gouw, a research physicist at NOAA's Earth System Research Laboratory in Boulder, Colo., who is unaffiliated with the studies.
How do
organic aerosols from biomass burning, which you
can see in the red dots, intersect with clouds and rainfall patterns?
However, because of its acidity, H2SO4 (and potentially MSA)
can enhance the formation and growth of secondary
organic aerosol (SOA) from
organic compounds (5, 44, 45), including those produced by homogeneous nucleation of low - volatility species (46).
Increased biomass
can lead to increased emissions of biogases such as dimethyl sulfide and isoprene, which when oxidized in the atmospheric form sulphate and
organic aerosols that
can nucleate clouds, increasing cloud cover and planetary albedo — the CLAW Hypothesis.
The response of biogenic secondary
organic carbon
aerosol production to a temperature change, however, could be considerably lower than the response of biogenic VOC emissions since
aerosol yields
can decrease with increasing temperature.
This thinning, which
can decrease the ozone concentration by as much as 70 percent, was caused by the rampant use of human - made chlorofluorocarbons (CFCs),
organic compounds that were once widely used in cooling systems and
aerosols.
Topics that I work on or plan to work in the future include studies of: + missing
aerosol species and sources, such as the primary oceanic
aerosols and their importance on the remote marine atmosphere, the in - cloud and
aerosol water aqueous formation of
organic aerosols that
can lead to brown carbon formation, the primary terrestrial biological particles, and the
organic nitrogen + missing
aerosol parameterizations, such as the effect of
aerosol mixing on cloud condensation nuclei and
aerosol absorption, the semi-volatility of primary
organic aerosols, the importance of in - canopy processes on natural terrestrial
aerosol and
aerosol precursor sources, and the mineral dust iron solubility and bioavailability + the change of
aerosol burden and its spatiotemporal distribution, especially with regard to its role and importance on gas - phase chemistry via photolysis rates changes and heterogeneous reactions in the atmosphere, as well as their effect on key gas - phase species like ozone + the physical and optical properties of
aerosols, which affect
aerosol transport, lifetime, and light scattering and absorption, with the latter being very sensitive to the vertical distribution of absorbing
aerosols +
aerosol - cloud interactions, which include cloud activation, the
aerosol indirect effect and the impact of clouds on
aerosol removal + changes on climate and feedbacks related with all these topics In order to understand the climate system as a whole, improve the
aerosol representation in the GISS ModelE2 and contribute to future IPCC climate change assessments and CMIP activities, I am also interested in understanding the importance of natural and anthropogenic
aerosol changes in the atmosphere on the terrestrial biosphere, the ocean and climate.
For a comprehensive GCM I
can count oceans, land, atmosphere, ice, biological processes,
organic and inorganic chemical processes, human - made sources and other effects, radiative energy transport, conduction and convective heat transfer, phase change, clouds and
aerosols, as some of the important system components, phenomena, and processes.
Theoretically, coatings of essentially non-absorbing components such as
organic carbon or sulphate on strongly absorbing core components such as black carbon
can increase the absorption of the composite
aerosol (e.g., Fuller et al., 1999; Jacobson, 2001a; Stier et al., 2006a), with results backed up by laboratory studies (e.g., Schnaiter et al., 2003).