Not exact matches
A rather straightforward calculation showed that doubling the level of carbon dioxide in the
atmosphere... which would arrive in the late 21st century if no steps were taken to curb emissions... should raise the temperature of the surface roughly one degree C. However, a
warmer atmosphere would hold more water
vapor, which ought to cause another degree or so of
warming.
Most climatologists expect that on average the
atmospheres water
vapor content will increase in response to surface
warming caused by the long - lived greenhouse gases, further accelerating the overall
warming trend.
They pointed to a
warmer atmosphere, which carries more water
vapor to worsen rainstorms, as well as to higher ocean surface temperatures, which intensify hurricanes.
The Indonesian archipelago sits in the Indo - Pacific
Warm Pool, an expanse of ocean that supplies a sizable fraction of the water
vapor in Earth's
atmosphere and plays a role in propagating El Niño cycles.
Moreover, the
warming makes the
atmosphere damper (providing still more water
vapor) and may cause the stratosphere to heat up, speeding the chemical reactions that destroy ozone.
The team chose the specific area examined in the study because it is Earth's
warmest open ocean region and a primary source of heat and water
vapor to the
atmosphere.
One thing is already clear: A
warmer global
atmosphere currently holds about 3 to 5 percent more water
vapor than it did at the beginning of the 20th century, and that can contribute to heavier precipitation.
The
warm conditions of the earth get a big boost from water
vapor as well as several other culprits, some of which never existed in the
atmosphere prior to human influence.
They strengthen over
warm water, such as that around Florida, and rising temperatures create more water
vapor in the
atmosphere, intensifying rainfall.
And more water
vapor worldwide is related to the
atmosphere being
warmer — we have about 7 percent more water
vapor in the
atmosphere now than we did in the 1950s, which is directly linked to the increase in heavy precipitation events.
Researchers have recently started to pay more attention to how water
vapor in the
atmosphere is related to global
warming.
By analyzing global water
vapor and temperature satellite data for the lower
atmosphere, Texas A&M University atmospheric scientist Andrew Dessler and his colleagues found that
warming driven by carbon dioxide and other gases allowed the air to hold more moisture, increasing the amount of water
vapor in the
atmosphere.
According to Dr. Kevin Trenberth at NCAR in Boulder, Colo., an increase in water
vapor floating overhead, triggered by
warming of the
atmosphere and oceans, is already loading the dice.
Another process knows as a «runaway greenhouse» occurs due to the increased greenhouse effect of water
vapor in the lower
atmosphere, which further drives evaporation and more
warming.
However, the surface
warming caused by human - produced increases in carbon dioxide, methane, and other greenhouse gases leads to a large increase in water
vapor, since a
warmer atmosphere holds more moisture.
For every 1 °C (1.8 °F) of
warming, the amount of water
vapor in the
atmosphere increases by about 7 percent.
However, this doesn't account for feedbacks, for example ice melting and making the planet less reflective, and the
warmer atmosphere holding more water
vapor (another greenhouse gas).
I presume this is because a
warmer atmosphere can hold more water
vapor, and that rain (or snow) has to come down somewhere.
Rahmstorf said in a follow up email that this is just basic physics, citing the Clausius - Clapeyron equation, which shows that the
atmosphere holds more water
vapor when it is
warmer, setting the stage for more rainfall.
It was hypothesized that if CO2
warmed the
atmosphere, the amount of water
vapor — itself a powerful greenhouse gas — in the
atmosphere should increase.
[1] CO2 absorbs IR, is the main GHG, human emissions are increasing its concentration in the
atmosphere, raising temperatures globally; the second GHG, water
vapor, exists in equilibrium with water / ice, would precipitate out if not for the CO2, so acts as a feedback; since the oceans cover so much of the planet, water is a large positive feedback; melting snow and ice as the
atmosphere warms decreases albedo, another positive feedback, biased toward the poles, which gives larger polar
warming than the global average; decreasing the temperature gradient from the equator to the poles is reducing the driving forces for the jetstream; the jetstream's meanders are increasing in amplitude and slowing, just like the lower Missippi River where its driving gradient decreases; the larger slower meanders increase the amplitude and duration of blocking highs, increasing drought and extreme temperatures — and 30,000 + Europeans and 5,000 plus Russians die, and the US corn crop, Russian wheat crop, and Aussie wildland fire protection fails — or extreme rainfall floods the US, France, Pakistan, Thailand (driving up prices for disk drives — hows that for unexpected adverse impacts from AGW?)
For example, they predicted the expansion of the Hadley cells, the poleward movement of storm tracks, the rising of the tropopause, the rising of the effective radiating altitude, the circulation of aerosols in the
atmosphere, the modelling of the transmission of radiation through the
atmosphere, the clear sky super greenhouse effect that results from increased water
vapor in the tropics, the near constancy of relative humidity, and polar amplification, the cooling of the stratosphere while the troposphere
warmed.
But there are solid physical reasons to expect acceleration — the radiative imbalance is growing along with the concentrations of GHGs; we are shedding reflective ice from the cryosphere; our
warming atmosphere is holding more water
vapor, a potent GHG; and we are melting permafrost and frozen soils to release methane.
As global
warming continues, the amount of water
vapor in the
atmosphere increases.
In Relationships between Water
Vapor Path and Precipitation over the Tropical Oceans, Bretherton et al showed that although the Western Pacific warmer surface waters increased the water in the atmosphere compared to the Eastern Pacific, rainfall was lower in the Western Pacific compared to the Eastern Pacific for equal amounts of water vapor in the atmospheric column — e.g., about 10mm / day in the Western Pacific, versus ~ 20mm / day in the Eastern Pacific at 55 mm water vapor, the peak of the distribution of water vapor amo
Vapor Path and Precipitation over the Tropical Oceans, Bretherton et al showed that although the Western Pacific
warmer surface waters increased the water in the
atmosphere compared to the Eastern Pacific, rainfall was lower in the Western Pacific compared to the Eastern Pacific for equal amounts of water
vapor in the atmospheric column — e.g., about 10mm / day in the Western Pacific, versus ~ 20mm / day in the Eastern Pacific at 55 mm water vapor, the peak of the distribution of water vapor amo
vapor in the atmospheric column — e.g., about 10mm / day in the Western Pacific, versus ~ 20mm / day in the Eastern Pacific at 55 mm water
vapor, the peak of the distribution of water vapor amo
vapor, the peak of the distribution of water
vapor amo
vapor amounts.
As the
atmosphere warms it can hold more water; that additional water
vapor provides more of the
warming than is directl caused by CO2.
This is just one of the many «interesting» weather events that we will all have to get used to in the future, as level of water
vapor continue to increase in the
warming atmosphere.
It also seems that even though the selective absorption of specific energy bands by different molecules IS the mechanism to add energy to the air, the energy absorbed by CO2 & especially Water
Vapor is extremely rapidly dispersed by molecular collisions to ALL the components of the
atmosphere, so that the N2 and O2 also heatup, and all the atmospheric components assume a uniform temperature (ie global
warming).
--- ignorance about atmospheric chemistry really shows here...... snip --- «Moreover, the CO2 that is supposedly causing «catastrophic»
warming represents only 0.00035 of all the gases in the
atmosphere (1.25 inches out of a 100 - yard football field), and proposals to control this vital plant nutrient ignore a far more critical greenhouse gas: water
vapor.»
Words only have meaning in context and while it may be true that water
vapor is a greenhouse gas in the sense that more of it in the
atmosphere will absorb more infrared radiation and
warm the climate, it is not a greenhouse gas in the sense that it is a gas we need to seriously worry about adding directly to the
atmosphere.
The surface heat capacity C (j = 0) was set to the equivalent of a global layer of water 50 m deep (which would be a layer ~ 70 m thick over the oceans) plus 70 % of the
atmosphere, the latent heat of vaporization corresponding to a 20 % increase in water
vapor per 3 K
warming (linearized for current conditions), and a little land surface; expressed as W * yr per m ^ 2 * K (a convenient unit), I got about 7.093.
increase in the concentration of water
vapor in the
atmosphere as the
atmosphere warms as indicated by the Clausius - Clapeyron equation.
In fact, as the
atmosphere warms, the «atmospheric window» tends toward closing (particularly because of water
vapor effects), and excess escape through this window can't account quantitatively for the reduction in stratospheric temperatures.
Simple physics dictates that with less sea ice there is magnified
warming of the Arctic due to powerful albedo feedback; this in turn reduces the equator to pole temperature gradient which slows the jet stream winds causing them to become more meridional; this combined with 4 % more water
vapor in the
atmosphere (compared to 3 decades ago) is leading to much more extremes in weather.
So a local spike in precipitation releases a lot of heat — but as the heat increases, this negatively affects the
vapor - > water transition (precipitation, or raindrop formation), since
warm air holds more water then cool air — and so the limit on precipitation vis - a-vis the radiative balance of the
atmosphere appears.
The incorrect sensitivity of climate to CO2 that the models have depends upon
warmer temperatures keeping more water
vapor in the
atmosphere.
The
warmer world would keep that extra water
vapor in the
atmosphere, not precipitate it.
If CO2 in the Anthropocene
atmosphere contributes to re-vegetating currently arid areas as it did post-LGM, we should expect an even greater
warming feedback from CO2 than is assumed from water
vapor and albedo feedbacks, due to decreased global dust - induced albedo and increased water
vapor from transpiration over increased vegetated area.
The rise in long - lived greenhouse gases (decades to centuries)
warms the
atmosphere and surface, and that increases the average amount of water
vapor in the
atmosphere.
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.
While rainfall in the region is consistent with the emerging El Niño, the unprecedented amounts suggest a possible climate change signal, where a
warming atmosphere becomes more saturated with water
vapor and capable of previously unimagined downpours.
Water
vapor feedback can also amplify the
warming effect of other greenhouse gases, such that the
warming brought about by increased carbon dioxide allows more water
vapor to enter the
atmosphere.
You appear to have your knickers all twisted about the generally accepted greenhouse theory, which states that GH gases (primarily water
vapor, plus some smaller ones, such as CO2) keep our planet
warmer than it would otherwise be if they were not in our
atmosphere.
One would get some water
vapor in the
atmosphere, but liquid water on the surface would be rare - probably more due to volcanic activity rather than sunlight
warming surface.
The water
vapor cooled the Earth, the snow cooled the
atmosphere with resulting increase in surface albedo which does reflect radiative heat, meaning the Earth gets less
warm, not colder because of it.
The fact that we sit at +15 C and not -15 C is definitive proof that water
vapor is not removed from the
atmosphere fast enough to not have an appreciable global
warming / climate change effect.
For example, the CO2 - induced global
warming allows the
atmosphere to hold more water
vapor.
The record
warm sea surface and
atmosphere held a never before seen excess of water
vapor and moisture in suspension — primarily over the Equatorial Ocean zones.
We also know that in a
warming world we have more water
vapor in the
atmosphere and some regional water bodies including the Gulf Of Mexico are
warmer now then in recent times most likely under the influences of climate change.
First, there's the well - known fact that a
warmer atmosphere can hold more water
vapor, meaning more moisture can be wrung out of the clouds when it does rain.