If they didn't, the bulk transport of heat upward would gradually
warm the upper atmosphere, and as I note above, a warm, less dense, upper atmosphere is utterly stable without conductivity or radiation.
--
warm the upper atmosphere so it radiates more heat away?
The amounts that are in Pluto's atmosphere are enough to absorb infrared radiation (heat) from the sun and
warm the upper atmosphere.
Radiation from
the warmed upper atmosphere, along with a small amount from the Earth's surface, radiates out to space.
Heat from anomalously warm ocean temperatures is transported vertically and eventually northward by unusually active tropical convection (thunderstorms),
warming the upper atmosphere in the lower latitudes.
Not exact matches
2017 was a strong season due to
warm Atlantic waters, a cooler
upper atmosphere, and nothing in the weather to blow the storms apart or steer them away from our shores.
While the temperatures will be cold and the lakes
warm, the amount of snow will be limited by the direction of the wind and relatively dry air in the
upper atmosphere.
Shock waves from turbulent winds in the spot and other storms help explain how the planet's
upper atmosphere stays
warm so far from the sun.
But for planetary scientists, Jupiter's most distinctive mystery may be what's called the «energy crisis» of its
upper atmosphere: how do temperatures average about as
warm as Earth's even though the enormous planet is more than fives times further away from the sun?
To slow Earth's
warming, some scientists have proposed pumping tons of tiny light - scattering particles into the
upper atmosphere to reflect sunlight back into space.
The hypothesis relates to an important component in tornado formation: the mixing of
warm air on the surface and cold air in the
upper atmosphere.
Reanalyzing the satellite temperature measurements, Quiang Fu of the University of Washington and his colleagues concluded that a cooling in the
upper atmosphere had been masking what is in fact a large
warming of the lower
atmosphere.
10 Most Atlantic hurricanes are born off the western coast of Africa, where
warm water and a cool, windy
upper atmosphere conspire to create a spiraling storm.
One theory is that heat from tropical rain
warms parts of the Earth's
upper atmosphere in ways that favor the formation of the classic «wavenumber - 5» pattern that has alternately drenched and dried parts of California.
And the
warming of the
upper 2 kilometers of the world ocean — a huge heat sink relative to the
atmosphere — continued apace through the 2000s.
The increase in solar radiation will
warm the Earth, making water vapour mix into the
upper atmosphere.
To have any hope of slowing the pace and holding down the
upper level temperatures that global
warming will bring over this century, the human population of the world will need to make large reductions of the additional billions of tons of greenhouse gases they are projected to be pumping into the
atmosphere, each year.
computer models... suggest the
upper atmosphere should have
warmed substantially in recent decades.
Despite consistently
warm waters, tropical cyclones in the Arabian Sea typically don't reach the higher end of the hurricane scale because winds in the
upper atmosphere tend to cut them off.
There are also numerous «fingerprints» which we would expect to see from an increased greenhouse effect (i.e. more
warming at night, at higher latitudes,
upper atmosphere cooling) that we have indeed observed (Figure 6).
In addition to these multiple lines of empirical evidence which contradict the GCR
warming theory, the galactic cosmic ray theory can not easily explain the cooling of the
upper atmosphere, greater
warming at night, or greater
warming at higher latitudes.
These fast - moving bands of winds are found in the
upper levels of the
atmosphere and are created due to Earth's rotation, and its air being
warmed up by solar radiation.
The researchers have found yet another peculiarity of Venus»
upper atmosphere: early in the morning it is
warmer than in the evening, while it should be the other way round.
During the long night the
upper atmosphere cools, so at night it should be
warmer than in the morning.
When snowfall is high in Siberia, the resultant cold air enhances atmospheric disturbances, which propagate into the
upper level of the
atmosphere, or stratosphere,
warming the polar vortex.
To have any hope of slowing the pace and holding down the
upper level temperatures that global
warming will bring over this century, the human population of the world will need to make large reductions of the additional billions of tons of greenhouse gases they are projected to be pumping into the
atmosphere, each year.
This recent slower
warming in the
upper ocean is closely related to the slower
warming of the global surface temperature, because the temperature of the overlaying
atmosphere is strongly coupled to the temperature of the ocean surface.
* If
warming warms the lower
atmosphere more than the
upper atmosphere, then the vertical gradients will likely increase.
computer models... suggest the
upper atmosphere should have
warmed substantially in recent decades.
The outgoing longwave radiation is composed not just of the radiation that leaks through to the top from the
warm lower layers, but also of the «cold» radiation emitted from the
upper atmosphere.
Surface is
warming but the
upper atmosphere is cooling equally to surface
warming, and there is no energy imbalance.
Lower
Atmosphere is
warming, oceans
upper layers are
warming, arctic summer sea ice is disappearing, WAIS and Greenland are both losing mass annually and the majority of the earths glaciers are losing mass too.
Thus, adding absorption to some new band will initially tend to
warm the colder
upper atmosphere and radiatively cool the lower
atmosphere and
warm the surface (The forcing at any level will be positive, so the surface + troposphere will
warm; if some of the increased flux escaping in parts of the spectrum where the abover layers have sufficiently small optical thickness, some of the
upper - level cooling will persist.
Less TOA cooling will occur if bands are placed where, in the
upper atmosphere or near TOA, they absorb more of the increases in radiation from below from surface + tropospheric (+ lower stratospheric)
warming.
«The rapid
warming of the Atlantic Ocean created high pressure zones in the
upper atmosphere over that basin and low pressure zones close to the surface of the ocean,» said Prof Axel Timmermann, co-lead and corresponding author from the University of Hawaii.
As we know from laboratory experiments, mathematical calculations, and observations of Venus and other planets in the Solar System, greenhouse gases change things in two ways: they trap heat from the sun in the lower
atmosphere, thus making the surface of the planet
warmer; and they keep heat from rising, thus making the
upper atmosphere colder.
- temperature sensors on satellites report much less
warming in the
upper atmosphere (which the theory of global
warming predicts should
warm first) than is reported by temperature sensors on the ground.
Add in that if it's the sun, the entire
atmosphere will
warm, since there's just simply more energy put in to the system, whereas if it is CO2 or other blanketing method, there's no extra energy put in, therefore the ground will
warm and the
upper air cool (since the
upper air isn't getting the
warming from the lower layers it used to get and the lower layers aren't losing the heat they used to).
With no ozone, the atmospheric temperature would decrease monotonically, and we would instead have to speak of cooling of the «
upper atmosphere» in conjunction with the surface
warming due to increasing GHGs.
A hotter sun would
warm the whole
atmosphere, but we know that the
upper atmosphere has been cooling.
This would actually not be true at sufficiently high latitudes in the winter hemisphere, except that some circulation in the
upper atmosphere is driven by kinetic energy generated within the troposphere (small amount of energy involved) which, so far as I know, doesn't result in much of a global time average non-radiative energy flux above the tropopause, but it does have important regional effects, and the result is that the top of the stratosphere is
warmer than the tropopause at all latitudes in all seasons so far as I know.
The lack of ozone is chilling the middle and
upper atmosphere, altering wind patterns in a way that keeps comparatively
warm air from reaching the surface.
I would argue that if we use a simple radiative model with a variety of assumptions, no
upper atmosphere cooling but only
warming will occur with increased CO2 (see # 333), based on the radiative transfer equations and the Second Law of thermodynamics, but when other complexities are introduced, this might change.
The condition that portions of the
upper atmosphere are significantly
warmer than otherwise via direct solar heating should (so far as I know) enhance the GHG - induced cooling at those levels.
«Sunlight passes through the
atmosphere largely unhindered and
warms the Earth's surface; the
warmed surface radiates heat and some of this radiation is absorbed in the
upper atmosphere and re-emitted, about half of the re-emitted energy returning to the Earth's surface.
We can divide the
atmosphere into a lower part (LP), which includes the surface and is the source of IR, and an
upper part (UP), which we are asked to assume will cool when CO2 increases, in conjunction with the expected
warming of LP from the enhanced greenhouse effect.
As more optical thickness is added to a «new» band, it will gain greater control over the temperature profile, but eventually, the equilibrium for that band will shift towards a cold enough
upper atmosphere and
warm enough lower
atmosphere and surface, such that farther increases will cool the
upper atmosphere or just that portion near TOA while
warming the lower
atmosphere and surface — until the optical thickness is so large (relative to other bands) that the band loses influence (except at TOA) and has little farther effect (except at TOA).
Re 346 ziarra, again: «The radiation from a cooler
upper atmosphere can
warm the surface because it counteracts the even greater amount of radiation in the other direction, thus reducing the net flow of heat.»
``... point out that cooling trends are exactly as predicted by increasing greenhouse gas trends,... It is interesting to note that significant solar forcing would have exactly the opposite effect (it would cause
warming)» (of the
upper atmosphere)
In that optic, is the cooling of the
upper Atmosphere sufficient to counterbalance the
warming of the troposphere, or is it necessary to investigate variations in the ocean temperature?