Oddly enough, Canavan goes on to cite some (presumably publicly funded) research on
aerosols from the Max Planck Institute which he thinks supports his arguments.
Many of the modelling studies performed since the TAR have investigated the RF of organic carbon
aerosols from both fossil fuel and biomass burning aerosols, and the combined RF of both components.
This is because planes emit mono - nitrogen oxides into the upper troposphere, form contrails, and seed cirrus clouds with
aerosols from fuel combustion.
OK, it finally sunk into my thick head, the large drops are
aerosols from the eruptions and the rises are from the atmosphere clearing.
The circled region on the right is among those researchers have identified as sooty
aerosols from wildfires.
Poking around with Scholar, I found mention of «hydrophobic soot particles from residential coal and industrial oil burning» and also mention of radar being used that distinguishes
aerosols from water vapor and clouds.
Sulfate
aerosols from coal burning lead to acid rain.
Climate models aren't omniscient, so once you allow for changes in the solar cycle, natural variability and light - scattering
aerosols from volcanic eruptions, the match is quite remarkable.
In terms of sulphate aerosols, both the direct radiative effects and the indirect effects on clouds were acknowledged, but the importance of carbonaceous
aerosols from fossil fuel and biomass combustion was not recognised (Chapters 2, 7 and 10).
Aerosols from human activity are shown to be increasing swiftly.
Mishchenko, M.I., B. Cairns, J. Chowdhary, I.V. Geogdzhayev, L. Liu, and L.D. Travis, 2005: Remote sensing of terrestrial tropospheric
aerosols from aircraft and satellites.
As stated earlier, I agree with the point that tropospheric
aerosols from fossil fuels are incredibly bad for human health and other environmental impacts (black carbon soot, acid rain, radioactive emissions, mercury poisoning), putting us in a situation of damned if we do, damned if we don't.
Such forcings include greenhouse gases, volcanoes, solar activity and air pollution — for example,
aerosols from coal burning, smog and volatile organics.
The injection of stratospheric
aerosols from the eruption of Mt. Pinatubo was noted as the first modern test of a known radiative forcing, and indeed one climate model accurately predicted the temperature response (Hansen et al., 1992).
Myhre, G., N. Bellouin, T.F. Berglen, T.K. Berntsen, O. Boucher, A. Grini, I.S.A. Isaksen, M. Johnsrud, M.I. Mishchenko, F. Stordal, and D. Tanre, 2007: Comparison of the radiative properties and direct radiative effect of
aerosols from a global aerosol model and remote sensing data over ocean.
The cooling and leveling off of average global temperatures during the 1950's and 1960's is attributed primarily to
aerosols from fossil fuels and other sources, when the greenhouse warming was overwhelmed by aerosol cooling.
Koch, D., T.C. Bond, D. Streets, N. Unger, and G. van der Werf, 2007: Global impacts of
aerosols from particular source regions and sectors.
A bit of digression, but can atmospheric warming have «stalled» because of the enormous emission of reflective
aerosols from coal burning in China and India in the last decade or so?p class =» response» > [Response: In principle yes, but the evidence that more heat has gone into the ocean is very strong.
Backing that up, NASA says that 1) sea surface temperature fluctuations (El Niño - La Niña) can cause global temperature deviation of about 0.2 °C; 2) solar maximums and minimums produce variations of only 0.1 °C, warmer or cooler; 3)
aerosols from natural sources such as volcanic eruptions (Mount Pinatubo for example) have caused average cooling of 0.3 °C, but recent eruptions have had not had significant effect.
Model calculations suggest that almost half of the global cloud condensation nuclei in the atmospheric boundary layer may originate from the nucleation of
aerosols from trace condensable vapours4, although the sensitivity of the number of cloud condensation nuclei to changes of nucleation rate may be small5, 6.
Global impacts of
aerosols from particular source regions and sectors.
Sulfate
aerosols from burning coal can make clouds grow bigger and rainstorms stronger.
In the decades that followed, scientists continued to puzzle over exactly how
aerosols from tailpipes and smokestacks alter the weather, in part because the particles are incredibly difficult to study.
Brenty - The increased level of atmospheric sulfate
aerosols from tropical volcanoes over the last decade, blocked sunlight reaching the Earth's surface, which has contributed to a very slight reduction in warming.
Other factors that could adversely impact the correlation between the sun and temperature include time lags in the transposition of a climate impulse, or cooling events through sun - blocking
aerosols from large volcanic eruptions.
how
aerosols from long - range transport and local sources influence cloud and precipitation in the U.S. West Coast, where ARs make landfall and post-frontal clouds are frequent.
The AMF2 was deployed on a research vessel offshore and provided critical measurements to quantify the moisture budget and cloud and precipitation processes associated with ARs and to characterize aerosols and aerosol - cloud - precipitation interactions associated with
aerosols from long - range transport in the Pacific Ocean.
That is far higher than
aerosols from vehicles, power plants and fires usually reach.
If we account for the cooling effect of sulphur
aerosols from industrial pollution, greenhouse gases have already contributed 2 ℃ of global warming.
If
aerosols from volcanic eruption sometimes dim the stratosphere, when they do circulate back out then we are left with dimmer surface albedo.
Researchers have blamed this short - lived cooling, more pronounced in the Northern Hemisphere, on a build - up of sunlight - blocking sulphate
aerosols from fossil fuels, which began to clear in the 1970s as pollution controls took hold.
In this case the computed forcings incorporate the effects of other aerosol types which have a similar spatial distribution to sulphate aerosols, such as nitrate aerosols or carbonaceous
aerosols from fossil fuel combustion.
Aerosols from such episodic volcanic events exert a transitory negative RF; however, there is limited knowledge of the RF associated with eruptions prior to Mt. Pinatubo.
Tiny
aerosols from spray deodorants?
«Residual analysis does not provide any evidence for a substantial cooling effect due to sulfate
aerosols from 1940 to 1970... sulfate aerosols produced by volcanoes or industrial emissions no doubt have a cooling effect»
A) a better temperature record (C&W or berkeley) both of which will increase the numerator (that thing on the top) B) a better OHC record (see the recent paper on sea level which will effect their estimates of OHC (the denominator thing) C) revised forcing due to
aerosols from small volcanos.
Natural variations in
aerosols from volcanoes should average out over time.
I am guessing that this would include increases in other associated GHGs (+ ve feedback) and increases in
aerosols from fuel burning -LRB-- ve feedback).
Journal of the Atmospheric Sciences, 32, pp. 2060 — 2066; four years before the same Schneider (Science, 1971 vol 173, pp. 138 - 141) was forecasting the imminent glaciation due to
the aerosols from the guilty human industry
During the 1950s and 1960s, average global temperatures levelled off, as increases in
aerosols from fossil fuels and other sources cooled the planet.
Estimating the actual optical properties of the ejecta is important, as is the background level of
aerosols from other sources (e.g. industrial).
``...
aerosols from fossil fuels and other sources cooled the planet.
I'm only saying this to note I know the anthropogenic
aerosols from this period can't be directly compared to the emission rate per fossil fuel input as later in the 20th century.
1) What is missing from your argument above is stratospheric
aerosols from volcanoes (B in the graph below):
A five - year investigation, ORACLES is examining the impact
aerosols from biomass burning in southern Africa has on climate as it mixes with clouds over the southeast Atlantic Ocean.
Aerosols from volcanic eruptions do have a cooling effect once they reach the stratosphere but the effect of high wind speed in the upper atmosphere would rapidly disperse these, and any local effects would be very slight.
I'm still struggling to see why a permament cloud of
aerosols from a nearby volcano is unable to measurably cool the surface but much less powerful chimney stacks are able to cool sorrounding regions to the extent that this cancels GHG warming.globally.
They're still using regression analysis to remove TSI, ENSO & volcanic
aerosols from the instrument temperature record for attribution.
Aerosols from unfiltered coal - burning Chinese power plant smokestacks seems to be a smashingly good technology to battle global warming.
Aerosols from power and industry sources contain significant sulfate, a scattering aerosol.