Unfortunately, mean temperatures have risen much further when account is taken of the short - term
masking effect of aerosols emitted from coal and oil, mainly sulphur dioxide and its oxidized products... «Thus, according to -LSB-...]
Not exact matches
The observed amount
of warming thus far has been less than this, because part
of the excess energy is stored in the oceans (amounting to ~ 0.5 °C), and the remainder (~ 1.3 °C) has been
masked by the cooling
effect of anthropogenic
aerosols.
Research by an international team
of scientists recently published in the journal Geophysical Research Letters says that the cooling
effect of aerosols is so large that it has
masked as much as half
of the warming
effect from greenhouse gases.
However, there is a price
of sorts — while locally the Asian Brown Cloud amplifies the greenhouse
effect, globally it
masks the greenhouse
effect due to the
aerosol - induced global dimming.
This is a peer reviewed paper by respected scientists who are saying that
aerosol forcing means that the majority
of the warming caused by existing co2 emission has effectively been
masked thus far, and that as
aerosols remain in the atmosphere for far shorter a duration
of time than co2, we will have already most likely crossed the 2 degree threshold that the G8 politicians have been discussing this week once the cooling
effect of aerosols dissipate.
Climate Resistance: What are the implications
of this work for the idea that the post-war temperature decline is the result
of sulphate
aerosols masking the warming
effect of CO2 emissions?
The orthodox explanation for that one is that the cooling
effect of white
aerosols such as sulphates — released from coal and oil burning — was
masking the warming
effect of greenhouse gases until various clean air acts allowed the anthropogenic warming trend to re-emerge.
Similarily, the uncertainty in
aerosols is mostly in the data (and then cloud
effects), the «
masking»
effect is a result
of the model's physics it isn't just parameterized and fed in.
The problem arises, I believe, when strong feedbacks, «
masking»
effects of aerosols and volcanoes and other uncertain assumptions are fed into computer models to generate catastrophic scenarios for the near - medium future.
The team found that 74 percent
of the warming that occurred during 1964 to 2010 was indeed
masked by the
aerosol cooling
effect.
Secondly as well as the CO2 there are
aerosols that
mask about half the
effect of the CO2, those
aerosols will wash out about twelve months after we stop polluting.
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], fr3]
The most current research shows that
aerosols do temporarily cool the planet,
masking the ongoing
effects of global warming.
«It is well understood that [
aerosols»] presence is
masking a substantial amount
of greenhouse gas warming,» says Cat Scott, a research fellow at the University
of Leeds whose own work has helped scientists understand the cooling
effect of aerosols.
Hmmm... don't suppose it occurred to anyone to check the amount
of anthropogenic
aerosols that were emitted during this time frame 1940 - 1970, or the fact that
aerosols have an immediate cooling
effect on troposphere temperatures that can
mask the underlying warming caused by the CO2 emissions that also accompany the
aerosols.
This is because the net warming it reports includes the cooling
effects of aerosols which partly
masks the warming caused by greenhouse gases.
Schwartz seems quite panicky though about the possibility
of a huge
masking aerosol effect which is why he did that work to pin down the CO2 sensitivity.
Global Climate Change Another Dire Global Warming
Effect: 10 Times as Many Ocean Dead Zones Global Warming to Blame for 37 %
of Droughts Human - Generated
Aerosols May be
Masking the Warming Effects
of Climate Change
Whilst apparently long known to exert a cooling
effect on climate, human - generated
aerosols have partly
masked the warming
effect of increasing greenhouse gases.