Global surface temperatures have continued to rise steadily beneath short - term
natural cooling effects, and the rise in global heat content has not slowed at all.
Could you please define «short term», so we would know when the anthropogenic greenhouse forcing is expected to trump the recent
natural cooling effects, whatever they may be.
Global surface temperatures have continued to rise steadily beneath short - term
natural cooling effects, and the rise in global heat content has not slowed at all.
Grooming offers
a natural cooling effect that can help your feline feel more comfortable when the temperature soars.
Seafloor sediments show that during past ice ages, more iron - rich dust blew from chilly, barren landmasses into the oceans, apparently producing more algae in these areas and, presumably,
a natural cooling effect.
1998 was a strong El Nino year, when temperatures are forced higher, whereas 2008 was a strong La Nina, when there is
a natural cooling effect.
Well - known for its breathability and
natural cooling effect, linen is a popular year - round fabric choice for warmer climates and warm sleepers.
Not exact matches
Because the Earth's climate has a certain amount of
natural variability, and those
natural cycles can have warming and
cooling effects that last for a couple of decades or even longer, Tebaldi said, it takes time to detect a change.
Scientists can measure how much energy greenhouse gases now add (roughly three watts per square meter), but what eludes precise definition is how much other factors — the response of clouds to warming, the
cooling role of aerosols, the heat and gas absorbed by oceans, human transformation of the landscape, even the
natural variability of solar strength — diminish or strengthen that
effect.
Of course, the fact that dust has played a
natural cooling role in the past does not mean that the deliberate application of iron filings to the ocean surface would have a similar
cooling effect today.
In a paper published this month in Geophysical Research Letters, Lovejoy concludes that a
natural cooling fluctuation during this period largely masked the warming
effects of a continued increase in human - made emissions of carbon dioxide and other greenhouse gases.
Because the AP1000 design uses a chimney
effect to draw air outside of the containment vessel upward (a design Westinghouse envisioned for
cooling the containment and preventing rust using
natural circulation), if radioactive air were to seep from the steel vessel, it would be ushered up into the outside air through the hole in the shield building roof.
One just included the effective influence on temperatures from manmade forces (including greenhouse gases and aerosols, which tend to have a
cooling effect), while the second included both manmade and
natural ones (including volcanic activity and solar radiation).
Over the last 30 years of direct satellite observation of the Earth's climate, many
natural influences including orbital variations, solar and volcanic activity, and oceanic conditions like El Nino (ENSO) and the Pacific Decadal Oscillation (PDO) have either had no
effect or promoted
cooling conditions.
Each en - suite bathroom is fitted with creamy
natural colored stone That matches the floors throughout the villa for a
cooling effect.
That is an argument for a bit of
cooling due to
natural cycles overcoming most of the warming
effects of rapidly rising CO2.
SCIENTIFIC UNDERSTANDING of these OTHER FACTORS â MOST NOTABLY
NATURAL climatic variations, changes in the sun's energy, and the
cooling effects of pollutant aerosols â REMAINS INCOMPLETE.»
This is an issue because we know there is a substantial long - term
natural cooling trend for high - latitude summers because of Earth orbital
effects, but the trend is nearly zero in the global annual average.
It would provide a partial explanation for not only the «pause» but 1910 - 1940 warming (mostly
natural), the 1940 - 1980 (
cooling / static period offset by increasing (but lower) CO2
effects), and the 1980 - 1998 warm period (
natural and ever increasing anthropogenic
effects).
Multi-signal detection and attribution analyses, which quantify the contributions of different
natural and anthropogenic forcings to observed changes, show that greenhouse gas forcing alone during the past half century would likely have resulted in greater than the observed warming if there had not been an offsetting
cooling effect from aerosol and other forcings.
Has anyone been able to separate the
effects of the
natural warming -
cooling cycles, of which the earth has had numerous for aeons, from the
effects of the recent rise in CO2?
Most scientists attribute this «pause» in warming to
natural climate cycles that have a
cooling effect on the planet, especially ocean oscillation cycles.
For instance, the warming that began in the early 20th century (1925 - 1944) is consistent with
natural variability of the climate system (including a generalized lack of significant volcanic activity, which has a
cooling effect), solar forcing, and initial forcing from greenhouse gases.
The leveling off between the 1940s and 1970s may be explained by
natural variability and possibly by
cooling effects of aerosols generated by the rapid economic growth after World War II.
Volcanic eruptions represent one kind of
natural event whose lofting of sulfur dioxide high into the stratosphere can create tiny particles that can have a temporary
cooling effect.
They looked at anthropogenic
cooling effects and the potential for
natural causes.
Akasofu's prediction is the least wrong of the contrarian predictions examined here, but with a 0.02 °C per decade
cooling prediction between 2000 and 2012, has not matched the 0.06 °C per decade warming trend, despite the fact that according to Foster and Rahmstorf,
natural climate influences have had an approximately 0.1 °C
cooling effect since 2000.
And thirty years later, there is vigorous debate over the magnitude of both
natural and anthropogenic factors, and how opposite
effects of the latter (SO2
cooling versus CO2 warming) net out.
It could be a relatively cheap, effective and quick way to
cool the planet by mimicking the
natural effects on climate of large volcanic eruptions, but scientists concede there could be dramatic and dangerous side
effects that they don't know about.
When you write - «The
effect of AGW has grown while the rate of
cooling due to the
natural variability may be close to its maximum.»
The
effect of AGW has grown while the rate of
cooling due to the
natural variability may be close to its maximum.
In
effect, these particles — whether aerosols or kitchen table salt — could act like
natural aerosols that
cool the planet after a volcanic eruption.
This would be some combination of warmings and
coolings due to
natural and / or human influences such as aerosols, instabilities in ocean currents, Length - Of - Day (LOD) fluctuations, the stadium wave (Wyatt and Curry), the 3M
effect (me, December 17, Global Environmental Change section, this AGU Fall Meeting), etc. etc..
A
NATURAL cooling process which reverses the
effects of global warming could be nearly TWICE as powerful as scientists previously believed.
The last decade hasn't been
cooling btw, though a slower upward trend or even standstill in the trend (of one would deem it meaningful over such a short timeframe) is of course helped by the dampening
effect of
natural factors having a
cooling effect, offsetting some of the warming
effect of GHG.
But the utter incoherence of views presented by deniers gives the game away even so (it's
cooling, it's warming but the sun is responsible, it's warming but some unknown
natural cycle is responsible, the «greenhouse»
effect violates the laws of thermodynamics, but somehow the energy radiated back to the surface by the atmosphere simply vanishes, there is a greenhouse
effect but negative feed - backs make it negligible, & c ad nauseam).
I would probably generally state it as «human CO2 activity has a measurable warming impact on global average temperature that can be readily discerned from the background of
natural climate change and other human
effects that may cause
cooling, and this warming impact will be, in general, neutral in impact for humanity and the biosphere».
Favourite plays include hyper - focus on one, extremely speculative study (T&S 09); misrepresenting the potential for abrupt
cooling in the C21st, dismissing the dominance of the centennial forced trend, misrepresenting deglacial abrupt climate change; grossly over-stating the accuracy and utility of pre-CERES TOA reconstructions (especially the synthetic, non-observational ISCCP - FD reconstruction); hyper - focus on interannual OHC variability; confusion of cause and
effect with long - term trends in OHC (CO2 forcing denial) and general inability to see that
natural variability from now on will be riding up a forced trend which will increasingly dominate climate behaviour.
Whatever the average regional temperature, it's hotter in the cities, because concentrations of traffic, business, heating, cooking, lighting and air conditioning generate what has become known as the urban heat island
effect: what makes this worse is that the asphalt, tarmacadam, stone, brick, glass and tile of which cities are made absorb radiation but prevent ground evaporation as a
natural cooling device.
The conclusion that Tamino draws, that
natural variability has a uniformly
cooling effect, and JNG's analysis that it has no
effect (or maybe up to 30 % with the uncertainty analysis in his second post) are not convincing, particularly in context of their allowing for the PDO to be the pause cause since 2002.
I guess you're saying there shouldn't be??? Anyway, according to the version of the greenhouse
effect theory used by the climate models, the greenhouse gases should be altering this
natural temperature profile by changing the rates of «infrared
cooling» from different altitudes.
The second issue raised in our Science paper (now available free, see bottom of this post) is that perhaps there shouldn't yet have been substantial long - term trends in hurricane intensity — whether we would be able detect them above the
natural variability or not — because until the last couple of decades, aerosol
cooling effects on hurricanes have been counteracting the
effects of greenhouse gas warming.
I suspect CO2 has some warming
effect, but I'm quite sure
natural processes can
cool to catastrophe.
In recent years, he has claimed that the Earth has been
cooling since 1998 (in 2006), that the Earth is warming, but it is
natural and unstoppable (in 2007), and that the warming is artificial and due to the urban heat island
effect (in 2009).
If
natural variability is a sort of sine wave
effect, and just moves the energy around, why did La Nina have a greater
cooling effect in the recent period after 1990 than El Nino had a warming
effect previous to that?
The
natural temperature control reduces the heat by up to seven degrees in the summer (relative to outside temperatures), due to
cooling effects of evaporation, resulting in more stress - free chickens!
Natural temperature influences have had a very slight cooling effect, and natural internal variability appears to have had a fairly significant cooling effect over the past decade, but little temperature influence over longer time
Natural temperature influences have had a very slight
cooling effect, and
natural internal variability appears to have had a fairly significant cooling effect over the past decade, but little temperature influence over longer time
natural internal variability appears to have had a fairly significant
cooling effect over the past decade, but little temperature influence over longer timeframes.
To stop catastrophic
natural global
cooling (CNGC) we need to pump out all the CO2 we can as a «precaution» to mitigate some of the
effects of cold — which are much worse than the
effects of warm.
Additionally a serious
cooling period from
natural causes is likely to increase oceanic CO2 absorption and so dampen down any CO2
effect in the subsequent
natural upturn although the length of lag is uncertain and may be as long as 800 years.
If you know what the forcings are and their magnitude, you can predict whether the climate will warm or
cool in the future and by how much, excepting the
effect of
natural variability (ie the internal variability of the climate system).