Using a NASA computer model, Oman tracked the worldwide effects of
the sulfate aerosol cloud that formed following the Laki eruption.
Not exact matches
Aerosols are already known to reduce global warming: The vast
clouds of
sulfates thrown up in the 1991 eruption of Mount Pinatubo in the Philippines, for example, reduced average global temperatures by about half a degree Celsius.
It comes from ARM and James Hansen's references to global dimming developing from
clouds being enhanced and or formed by pollution,
sulfates, and or certain
aerosols and so forth.
Rose, D., S.S. Gunthe, E. Mikhailov, G.P. Frank, U. Dusek, M.O. Andreae and U. Pöschl, Calibration and measurement uncertainties of a continuous - flow
cloud condensation nuclei counter (DMTCCNC): CCN activation of ammonium
sulfate and sodium chloride
aerosol particles in theory and experiment, Atmospheric Chemistry and Physics, 8, 1153 - 1179, 2008.
The team evaluated simulated
cloud fields from the multi-scale
aerosol - climate model and examined how specific human - caused
aerosols, such as
sulfate, black carbon (soot), and organic carbon affect those
clouds and, in turn, the climate.
c) anthropogenic
aerosols — mainly
sulfate and nitrate (from emissions of SO2 and NOx / NH3) have a strong direct effect and undoubted liquid
cloud nucleation impacts (the indirect effects).
It is my understanding that the uncertainties regarding climate sensitivity to a nominal 2XCO2 forcing is primarily a function of the uncertainties in (1) future atmospheric
aerosol concentrations; both
sulfate - type (cooling) and black carbon - type (warming), (2) feedbacks associated with
aerosol effects on the properties of
clouds (e.g. will
cloud droplets become more reflective?)
If
sulfate aerosols nucleate
cloud drops, resulting in a greater number of smaller droplets rather than a few large ones, this will further increase scattering and cooling.
Sulfate aerosol is a health hazard, limits visibility, degrades buildings, reflects solar radiation (cooling the climate) and also impacts
cloud properties (increasing their lifetime and reducing rainfall).
Here I summarize two recent papers that model solar radiation management: the practice of offsetting global warming by partially blocking sunlight, whether by seeding
clouds, adding
sulfate aerosols to the stratosphere, or placing giant mirrors in space.
DMS is the primary source in the
sulfate mass budget over the remote ocean west of 80 ° W. • The first
aerosol indirect effect has been observationally quantified over the SEP, with
cloud thinning of the more polluted coastal
clouds mitigating the overall radiative impact.
At the coast anthropogenic
aerosols result in brighter but optically thinner
cloud — offshore dimethyl
sulfate helps form thicker
cloud.
Global
sulfate production plays a key role in
aerosol radiative forcing; more than half of this production occurs in
clouds.
The black line, reconstructed from ISCCP satellite data, «is a purely statistical parameter that has little physical meaning as it does not account for the non-linear relations between
cloud and surface properties and planetary albedo and does not include
aerosol related albedo changes such as associated with Mt. Pinatubo, or human emissions of
sulfates for instance» (Real Climate).
Sulfate aerosols from burning coal can make
clouds grow bigger and rainstorms stronger.