Sentences with phrase «increased water vapour in»

Higher SSTs are generally accompanied by increased water vapour in the lower troposphere (see Section 3.4.2.1 and Figure 3.20), thus the moist static energy that fuels convection and thunderstorms is also increased.

The fact that the actual measured planetary warming is less than the lowest IPCC model prediction warming and is found only at high latitudes (which is not predicted by the IPCC models) logically supports the assertion that the planet's response to a change in forcing is to resist the change (negative feedback, planetary clouds in the tropics increase reflecting more sunlight in to space) rather than to amplify the change (positive feedback) due increased water vapour in the atmosphere.

It is noteworthy that the influence of warmer temperatures and increased water vapour in the atmosphere (Section 2.5.3) are not independent events, and are likely to be jointly related to increases in heavy and extreme precipitation events.

«The study is the first to confirm that human activities have increased water vapour in the upper troposphere,» said Brian Soden, professor [continue reading...]

Precipitation patterns of increased water vapour in clouds are generating massive water dumps and prolonged precipitation.

It is then amplified by increased water vapour in the atmosphere resulting from the warming caused by the CO2.

Increase water vapour in the atmosphere = > increased GH effect.

Oh and, while the water vapour content of air may be dependent on temperature, cloud cover certainly isn't No, not entirely, but increased water vapour is the main contributors to cloud formation, and, as you almost point out, increased temperature increases water vapour in the atmosphere.

However, it is a result of the feedback described above which increases water vapour in the atmosphere.

Not exact matches

Water vapour levels in the stratosphere increased in the 1990s but dropped by 10 per cent in 2001.

One of the most interesting findings was that stomatal pores on the surface of the leaf (small holes that control the uptake of CO2 for photosynthesis and the loss of water vapour) increase in number after multi-generation exposure to future CO2.

In a warming world, atmospheric water vapour content is expected to rise due to an increase in saturation water vapour pressure with air temperaturIn a warming world, atmospheric water vapour content is expected to rise due to an increase in saturation water vapour pressure with air temperaturin saturation water vapour pressure with air temperature.

This is likely to result in increased water vapour transport.

The result is that when water vapour processes are correctly represented, the sensitivity of the climate to a doubling of carbon dioxide — which will occur in the next 50 years — means we can expect a temperature increase of at least 4 °C by 2100.

What makes these figures significant is the increasing evidence that nitrogen oxides (NOx) and water vapour in these emissions play a key role in destroying ozone.

In addition, around the tropopause the air is close to saturation with water and a small increase of vapour from aircraft can create wide expanses of thin cirrus clouds that cause even stronger warming.

At temperate latitudes in the northern hemisphere, air traffic has increased the amount of water vapour in the lower stratosphere by about 10 per cent over the past thirty years.

The increase in solar radiation will warm the Earth, making water vapour mix into the upper atmosphere.

This is a function of the increase in fractionation as water vapour is continually removed from the air.

Total column water vapour has increased over the global oceans by 1.2 ± 0.3 % per decade from 1988 to 2004, consistent in pattern and amount with changes in SST and a fairly constant relative humidity.

I would assume that the increase in stratospheric water vapour would make for a thicker vail of sulfuric acid given a large volcanic eruption.

And that additional water vapour would in turn cause further warming - this being a positive feedback, in which carbon dioxide acts as a direct regulator of temperature, and is then joined in that role by more water vapour as temperatures increase.

Observational evidence indicates that the frequency of the heaviest rainfall events has likely increased within many land regions in general agreement with model simulations that indicate that rainfall in the heaviest events is likely to increase in line with atmospheric water vapour concentration.

Simulations and observations of total atmospheric water vapour averaged over oceans agree closely when the simulations are constrained by observed SSTs, suggesting that anthropogenic influence has contributed to an increase in total atmospheric water vapour.

2) In a confined volume, an increase in evaporation will result in an increased vapour pressure of H2O in the atmosphere above the water surfacIn a confined volume, an increase in evaporation will result in an increased vapour pressure of H2O in the atmosphere above the water surfacin evaporation will result in an increased vapour pressure of H2O in the atmosphere above the water surfacin an increased vapour pressure of H2O in the atmosphere above the water surfacin the atmosphere above the water surface.

Source: Lyman 2010 The reaction of the oceans to climate change are some of the most profound across the entire environment, including disruption of the ocean food chain through chemical changes caused by CO2, the ability of the sea to absorb CO2 being limited by temperature increases, (and the potential to expel sequestered CO2 back into the atmosphere as the water gets hotter), sea - level rise due to thermal expansion, and the amount of water vapour in the atmosphere.

Scientists agree that a doubling of atmospheric CO2 levels could result in temperature increases of between 1.5 and 4.5 °C, caused by rapid changes such as snow and ice melt, and the behaviour of clouds and water vapour.

When the Arctic sea ice goes the increase in water vapour in the Arctic region will accelerate the Greenland melt.

The increase in water vapour as the surface warms is key, but so might be changes in boundary layer stability, rossby wave generation via longitudinally varying responses at the surface, impacts of the stratopshere on the steering of the jet, and the situation is completely different again for tropical storms.

1998 was so warm in part because of the big El Niño event over the winter of 1997 - 1998 which directly warmed a large part of the Pacific, and indirectly warmed (via the large increase in water vapour) an even larger region.

The water vapour theory suggests that a small increase in CO2 will result in a large positive feedback loop from water vapour and this feedback loop will lead to dangerous warming.

So we've nailed the Arctic after a fashion & Rondonia for three months of the year, both instances with quite extreme increases in water vapour.

Given the lower temperatures and lower water vapour content at higher altitudes and a need for high supercooling to initiate condensation (in the absence of sufficient normal CCN), wouldn't an increased source of nuclei, in the form of GCRs, enhance high - and middle - altitude cloud formation?

Without the Arctic sea ice insulating the air from the water beneath, the increase in water vapour will be dramatic.

Indeed, there is a clear physical reason why this is the case — the increase in water vapour as surface air temperature rises causes a change in the moist - adiabatic lapse rate (the decrease of temperature with height) such that the surface to mid-tropospheric gradient decreases with increasing temperature (i.e. it warms faster aloft).

Other feedbacks include forests, and most importantly, water vapour, which as the temperature of the atmosphere rises increases in the atmosphere (think tropical rain forest), and water vapour is a potent greenhouse gas (but it is not the «controller» of our climate because it does not accumulate in the atmosphere, only gases like CO2, methane and nitrous oxide do this) See Skeptical Science https://skepticalscience.com/co2-lags-temperature.htm

For reference, the amplification is related to the sensitivity of the moist adiabat to increasing surface temperatures (air parcels saturated in water vapour move up because of convection where the water vapour condenses and releases heat in a predictable way).

and first mention of «global warming» on pg xi The main greenhouse gas, water vapour, will increase in response to global warming and further enhance it»

(c) The level of water vapour depends on the global temperature, so it is roughly fixed until something else warms the atmosphere when it increases in amount producing more warming.

The rise of CO2 from 270ppm to now over 400ppm, the extent of equatorial and sub tropical deforestation, the soot deposits on the polar ice caps, the increase in atmospheric water vapour due to a corresponding increase in ocean temps and changes in ocean currents, the extreme ice albedo currently happening in the arctic etc, etc are all conspiring in tandem to alter the climate as we know it.

The increased water vapour then amplifies the effect on temperature caused by the original increase in carbon dioxide.

And the other sort of latent heat, a decrease in atmospheric water vapour is also the stuff of fantasy requiring a change of 50,000 cu km when the atmosphere only contains (and only can contain) ~ 13,000 cu km without crazy temperature increases.

[10] All of the models used by the IPCC assume that this increase in water vapour will result in a positive feedback in the order of 3 - 4 times the increase in temperature that would be caused by the increase in CO2 alone.

Furthermore natural global temperature swings alter the natural background greenhouse effect constantly as water vapour held in the atmosphere increases and decreases naturally with changing global temperatures.

The increased water vapour blocks long wave radiation which causes an increase in temperature of tropical troposphere at around 8K and an increase in long wave radiation, a portion of which is emitted back down to the surface of the planet to amplify the CO2 forcing.

The observed regional changes are consistent in pattern and amount with the changes in SST and the assumption of a near - constant relative humidity increase in water vapour mixing ratio.

Higher modelled temperature in the troposphere enables the general circulation model to assume there is more water vapour in the troposphere which amplifies the CO2 forcing by increasing the amount of water vapor in troposphere.

July 17, 2013 at 1:39 pm The lapse rate feedback is only a negative feedback (in the general circulation model) if the long wave radiation that is released when the water vapour condenses is emitted to space rather than trapped by increased water vapour.

Empirical data show clearly that the IPCC's deterministic models overestimate the amount of warming associated with increases in water vapour (see paper summaries in NIPCC - II, Chapter 1).

If an increase of 5 % in CO2 results in an increase of 1 % in water vapour, and if water vapour has say 30x the influence of CO2 on heat trapping, then a 1 % increase in CO2 will result in an increase of 30/5 = 6 % in the heat trapping impact of water vapour.