Not exact matches
Either one of those aircraft effects can drop the
air temperature by more
than 35 degrees Fahrenheit, flash - freezing the
water vapor.
For that to be possible, the
air must contain even more
water vapor than is usually required to form clouds, reaching a very high state of supersaturation.
While the ECS factors in such «fast» feedback effects as changes in
water vapor —
water itself is a greenhouse gas, and saturates warm
air better
than cold — they argued that slow feedbacks, such as changes in ice sheets and vegetation, should also be considered.
No sooner had the aircraft begun to emerge from the lower reaches of the fog — its outer edges trailing tendrils of
water vapor like wisps of smoke —
than the
air was rent by the pounding percussions of antiaircraft fire.
Specific humidity content of the
air has increased, as expected as part of the conventional
water vapor feedback, but in fact relative humidity also increased between 1950 and 1990, indicating a stronger
water vapor feedback
than given by the conventional assumption of fixed relative humidity.
The
air at the top of the troposphere is colder
than the
air at the ground because of a.
water vapor b. expansion of gas c. light energy d. ozone
First is that warmer
air can hold more
water vapor, leading to torrential rains in coastal regions that last longer
than usual.
Warmer
air holds more
water vapor than colder
air, so the amount of
water vapor in the lower atmosphere increases as it is warmed by the greenhouse effect.
I believe if you just use a CLOSED cell foam (much better
water /
vapor /
air / thermal barrier
than either open cell or cellulose) with almost no thermal bridging in the wall then it kind of solves lots of problems all at once...
Since
water vapor is lighter
than the main constituents of
air,
air containing
water vapor is lighter and so rises above less humid
air.
A parcel of
air containing
water vapor is lighter
than air without as much.
A thunderstorm event might be best depicted as a run - away rising column of
air that is becoming progressively warmer
than the surrounding
air as condensing
water vapor yields its heat of vaporization until almost all
water vapor has condensed out and then cooling at a rate of 9.8 deg C per 1000 meters, it eventually reaches a warmer layer of
air and spreads out like smoke over a ceiling.
This is because
water vapor is lighter
than air.
This means that
air flowing from the surface and converging into the Pineapple Express would have a chance to be carrying greater -
than - usual amounts of low - level
water vapor, thus intensifying the moisture channel.»
This is why gardeners will put
water vapor in the
air and
water liquid on the ground around their garden on a clear cold night — it protects the local area from cooling as fast because
water vapor and liquid both 1) cool much slower
than dry
air due to their massive heat capacity, and 2) cool even slower because they release their massive latent heat, which means that heat energy is released from them without requiring a drop in temperature — once they're in the latent heat release phase, they just keep shedding energy without dropping in temperature any further.
Adding the influence of
water vapor concentration to the density profile makes the difference between the densities of the two cases a little larger, because
water vapor lowers the density as H2O molecules are lighter
than average for dry
air.
My guess would be that the heat capacity of the
air would dominate (surely the volume of
air in a forest is more
than 1000x the volume of the leaves), in which case the cooling effect would still be an order of magnitude greater
than the buoyancy of
water vapor effect (but no more
than 13X).
You are probably also aware already that
water vapor is as much if not more of a so called greenhouse gas
than carbon dioxide is and there is a lot of evaporating ocean
water on the planet not to mention clouds and high tropical humidity because hot
air provides added space in the atmosphere for
water vapor gas to become a major component of
air.
Water vapor is a stronger greenhouse gas
than CO2 and its concentration in the
air is between 25 and 50 times greater
than CO2.
When you see condensation on the bathroom mirror, you know the dew point of the
water vapor in the
air is equal to or higher
than the surface temperature of the mirror.
Shifts in clouds,
water vapor, and the great currents in the ocean and
air, however, cause complex responses in which some regions warm more
than the average while others warm less
than average, or even cool.
Warm
air can hold a lot more moisture (
water vapor)
than colder
air.
Water vapor is just a trace gas, less
than one half of one percent of the
air in the atmosphere.
By combining these two elements, VPD plots the unstable situation created when
air holds less
water vapor — or has a lower humidity —
than is possible at a certain temperature.
Air masses are more mobile
than the ocean
waters, and when they move to a cooler region, the
water vapor condenses as rain or snow, leaving the heat energy in the atmossphere.
-- It seems perfectly reasonable to me that if we imagine the surface never emits that energy in the first place, - energy that is stored in the surface and just below, i.e. oceans, lakes, rivers, ground, and
air, — just to mention a few, then any surface temperature change would be completely reliant on variations in Solar irradiation and advection mainly by
Water Vapor (WV) but also by other GHGs that have the ability to contain more heat
than the rest of the atmospheric gases.
The end result is there's virtually no heating beyond the first few micrometers and the molecules near the surface just keep picking up more and more energy as latent heat until they have enough energy to vaporize and then they leave the surface and quickly convect upwards because
water vapor is lighter
than air.
Dave Springer says: ``... the molecules near the surface just keep picking up more and more energy as latent heat until they have enough energy to vaporize and then they leave the surface and quickly convect upwards because
water vapor is lighter
than air.
It seems perfectly reasonable to me that if we imagine the surface never emits that energy in the first place, - energy that is stored in the surface and just below, i.e. oceans, lakes, rivers, ground, and
air, — just to mention a few, then any surface temperature change would be completely reliant on variations in Solar irradiation and advection mainly by
Water Vapor (WV) but also by other GHGs that have the ability to contain more heat
than the rest of the atmospheric gases.
Still more persuasive to scientists of the day was the fact that
water vapor, which is far more abundant in the
air than carbon dioxide, also intercepts infrared radiation.
Warm
air holds more
water vapor than cold
air does, so the
air is more humid
than a few years ago.
(A third of summer sea ice in the Arctic is gone, the oceans are 30 percent more acidic, and since warm
air holds more
water vapor than cold, the atmosphere over the oceans is a shocking five percent wetter, loading the dice for devastating floods.)
Warmer
air holds more
water vapor than colder
air, so global warming will make the lower atmosphere wetter.
Pekka: Your description patently conflicts with the following geophysical realities: a)
Water vapor is lighter
than air and adds extra lift to thermally forced convection.
«Warmer
air can contain more
water vapor than cooler
air,» according to the 2014 Climate Assessment produced by the U.S. government.
Because
water vapor is lighter
than dry
air (mostly nitrogen and oxygen), that layer of
air can move upward in the attic.
First, warm
air holds more
water vapor than cold
air — and the rising
air temperatures since the 1970s have caused the atmospheric
water vapor content to rise as well.
«Humid
air holds
water vapor until it contacts a surface whose temperature is less
than or equal to the dew point,» he says.