The dayside of a planet close to an M dwarf, however, might become so hot that
water escapes to space; on the frigid nightside, the atmosphere could freeze to the surface.
Not exact matches
A global magnetic field might have funnelled enough energy into the atmosphere
to push lighter particles
escape into
space, like steam from a pot of boiling
water, for example.
As Mars Express flies in polar orbit, dipping
to within 155 miles of the planet spinning beneath it, instruments made in Sweden, France, and Italy will map the composition of the atmosphere, looking in part for evidence that vestiges of that
water are still
escaping into
space.
The preferential
escape of lighter hydrogen over time would then lead
to a skewed ratio of H2O
to HDO on Mars, indicative of how much
water has
escaped into
space.
If the energy delivered
to Earth by the Sun or by impacts (or both) were 40 % greater, the Earth would experience a runaway greenhouse.3 That is, more
water would evaporate from Earth's surface, so too much heat trying
to escape into outer
space would be blocked by
water vapor in the atmosphere.
Had a Mars - size impact occurred, many small moons should have formed.e Also, the impactor's glancing blow would either be too slight
to form our large Moon, or so violent that Earth would end up spinning too fast.f Besides, part of Earth's surface and mantle would have melted, but none of the indicators of that melting have been found.g Small particles splashed from Earth would have completely melted, allowing any
water inside them
to escape into the vacuum of
space.
It has an alluring defiance defined by traits like noise, heat, harshness, and
space limitation, and its shrill looks, eye -
watering full - throttle urge, and exciting
escapes to the limit will no doubt give those lucky 40 drivers goose bumps whenever they press down on the gas.
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(PS regarding Venus — as I have understood it, a runaway
water vapor feedback would have occured when solar heating increasing
to become greater than a limiting OLR value (Simpson - Kombayashi - Ingersoll limit — see http://chriscolose.wordpress.com/2010/08/23/climate-feedbacks-part-1/ — although I should add that at more «moderate» temperatures (warmer than today), stratospheric H2O increases
to a point where H
escape to space becomes a significant H2O sink — if that stage worked fast enough relative
to solar brightening, a runaway H2O case could be prevented, and it would be a dry (er) heat.
What other things in the Earth system will change when it warms up that will affect how much SW radiation is reflected back into
space [eg ice - albedo feedback, cloud changes] or affect what proportion of emitted LW radiation is allowed
to escape to space [eg
Water Vapour, cloud changes].
Of course, though some of the flux up at the tropopause
escapes directly
to space, and some is absorbed by CO2 (over the whole stratosphere in the wings of the CO2 band, concentrated towards the base of the stratosphere for larger optical thicknesses), some is absorbed by ozone (with variable concentration), and some by
water vapor.
When it reaches a level high enough
to cool it
to it's «dew point» the
water vapour condenses out in the form of clouds and rainfall and the Latent Heat of Condensation is released into the upper part of the atmosphere
to accelerate the
escape of radiant energy
to space.
Rising
water vapor content, particularly in the upper troposphere greatly reduce the amount of outgoing longwave radiation (OLR) which can
escape to space.
Since the greenhouse effect is all about how energy
escapes from the atmosphere
to space, CO2 and other well - mixed greenhouse gases have more «leverage», so
to speak, than does
water.
We do not assume that albedo will increase on average
to reject more heat, both through cloud SW rejection, and reduction of the distance
water droplet LW needs
to travel
to escape to space.
The declining upper atmosphere
water vapour allows heat
to escape to space, offsetting the warming effect of increasing CO2 concentrations.
Additionally, while nearly 80 percent of the sunlight reflected from a roof can
escape to outer
space, the «thermal infrared» energy radiated by a hot, dark roof is trapped by greenhouse gases, such as CO2 and
water vapor, warming the atmosphere.
The additional
water vapor, acting as a greenhouse gas, absorbs energy that would otherwise
escape to space and so causes further warming.
Arrival at this terminal state required passing through a «moist greenhouse» state in which surface
water evaporates,
water vapour becomes a major constituent of the atmosphere and H2O is dissociated in the upper atmosphere with the hydrogen slowly
escaping to space [106].
A warming of 16 — 24 °C produces a moderately moist greenhouse, with
water vapour increasing
to about 1 % of the atmosphere's mass, thus increasing the rate of hydrogen
escape to space.
That Venus had a primordial ocean, with most of the
water subsequently lost
to space, is confirmed by the present enrichment of deuterium over ordinary hydrogen by a factor of 100 [107], the heavier deuterium being less efficient in
escaping gravity
to space.
The heat provided by the Sun has
to escape into
space (within 12 - 24 hours in reality on average) so it is the total
water vapour in the complete - all - the - way - the - top of the atmosphere that is in question here.
Scientists have proposed ways
to clear
space junk by launching
water at it and have taken measures such as astronauts sleeping in
escape pods in reaction
to the growing
space debris problem.
Because of the different intramolecular forces between
water molecules as vapor in air,
water, and ice, the wavelengths of emission and absorption are shifted; some of the radiation from the
water / ice droplets at the top of a cloud can
escape to space because the atmosphere above it is transparent at its wavelengths, whereas the same radiation from droplets at the bottom of a cloud will be absorbed and re-emitted in random directions from the droplets above, including back down
to the originating droplets.