The basic principle is that the hydrologic cycle accelerates — warming enhances evaporation,
increases atmospheric water content, and subsequently enhances precipitation as well
One can just as well say «extra sunshine hours (SSH) enhances evaporation,
increasing atmospheric water content, and subsequently enhances precipitation as well»
Thousands of studies conducted by researchers around the world have documented changes in surface, atmospheric, and oceanic temperatures; melting glaciers; diminishing snow cover; shrinking sea ice; rising sea levels; ocean acidification; and
increasing atmospheric water vapor.
His problem is that he wants a feedback from
increased atmospheric water, for which there is no evidence.
Unfortunately for them while CO2 has
increased atmospheric water graph and temperature graph have not.
That increased atmospheric water vapor will also affect cloud cover, though impacts of changes in cloud cover on climate sensitivity are much more uncertain.
Thousands of studies conducted by researchers around the world have documented changes in surface, atmospheric, and oceanic temperatures; melting glaciers; diminishing snow cover; shrinking sea ice; rising sea levels; ocean acidification; and
increasing atmospheric water vapor.
We found that Colorado River flows decline by about 4 percent per degree F increase, which is roughly the same amount as
the increased atmospheric water vapor holding capacity discussed above.
Not exact matches
This implies that risks are not too big or overarching (like resource scarcity, rising levels of
atmospheric CO2, or global warming) but are more focused e.g. extreme weather,
increased greenhouse gas emissions from agriculture or from energy use, or a lack of fresh
water.
The
increased sunlight reflectance in the sky would keep the
waters below from warming up to the hurricane threshold while also curbing evaporation, thereby reducing the
atmospheric moisture needed to make a storm.
The researchers believe the greening is a response to higher
atmospheric carbon dioxide inducing decreases in plant stomatal conductance — the measure of the rate of passage of carbon dioxide entering, or
water vapor exiting, through the stomata of a leaf — and
increases in soil
water, thus enhancing vegetation growth.
The ice algae seem to be one of the major players in this scheme — even the slight
increase of the
atmospheric temperature and liquid
water production seems to promote algae colonization across the ice surface.
As
atmospheric carbon dioxide
increases, the greenhouse gas is absorbed into ocean
water, making it more acidic.
Warmer temperatures could extend the growing season in northern latitudes, and an
increase in
atmospheric carbon dioxide could improve the
water use efficiency of some crops.
In a warming world,
atmospheric water vapour content is expected to rise due to an
increase in saturation
water vapour pressure with air temperature.
As emissions from human activities
increase atmospheric carbon dioxide, they, in turn, are modifying the chemical structure of global
waters, making them more acidic.
As a result of
atmospheric patterns that both warmed the air and reduced cloud cover as well as
increased residual heat in newly exposed ocean
waters, such melting helped open the fabled Northwest Passage for the first time [see photo] this summer and presaged tough times for polar bears and other Arctic animals that rely on sea ice to survive, according to the U.S. Geological Survey.
Predicting how
increasing atmospheric CO2 will affect the hydrologic cycle, from extreme weather forecasts to long - term projections on agriculture and
water resources, is critical both to daily life and to the future of the planet.
Their results showed that changes in key
water - stress variables are strongly modified by vegetation physiological effects in response to
increased CO2 at the leaf level, illustrating how deeply the physiological effects due to
increasing atmospheric CO2 impact the
water cycle.
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.
Now if we add
water vapor to the atmosphere it
increases the greenhouse effect in the spectral regions that are not saturated not opaque, which means in the
atmospheric window.
Recent studies have shown a doubling of stratospheric
water vapour, likely from
increasing atmospheric heights due to global warming, overshooting thunderstorm tops from stronger tropical cyclones and mesoscale convective systems etc...
However, more
atmospheric CO2 is predicted to
increase crop biomass and subsequent yields, and reduce
water use by allowing plant stomates to open over shorter periods, thus assimilating the same amount of
atmospheric CO2 while conserving moisture (Cutforth et al. 2007).
... The Earth's
atmospheric methane concentration has
increased by about 150 % since 1750, and it accounts for 20 % of the total radiative forcing from all of the long - lived and globally mixed greenhouse gases (these gases don't include
water vapor which is by far the largest component of the greenhouse effect).
The factors that determine this asymmetry are various, involving ice albedo feedbacks, cloud feedbacks and other
atmospheric processes, e.g.,
water vapor content
increases approximately exponentially with temperature (Clausius - Clapeyron equation) so that the
water vapor feedback gets stronger the warmer it is.
The team observed signatures of glowing
water molecules, which indicated that WASP - 121b's
atmospheric temperatures
increase with altitude, Evans said.
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.
A sudden and intense
increase of solar particles eliminated the
atmospheric and hydrological protection, causing the atmosphere to thin and
water to retreat from the surface.
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.
• The methanetrack.org website has shown significant
increases in
atmospheric methane concentrations over Antarctica this austral winter (which I believe are due to
increases in methane emissions from the Southern Ocean seafloor due to
increases in the temperature of bottom
water temperatures), and if this trend continues, then the Southern Hemisphere could be a significant source of additional
atmospheric methane (this century).
Global warming also leads to
increases in
atmospheric water vapor, which
increases the likelihood of heavier rainfall events that may cause flooding.
For example, a biogeochemical model can be used to show that dumping iron in the oceans will have no effect on
atmospheric CO2, as any
increase in algal growth will be accompanied by
increases in remineralization of algal biomass in the
water column.
Geoengineering proposals fall into at least three broad categories: 1) managing
atmospheric greenhouse gases (e.g., ocean fertilization and
atmospheric carbon capture and sequestration), 2) cooling the Earth by reflecting sunlight (e.g., putting reflective particles into the atmosphere, putting mirrors in space to reflect the sun's energy,
increasing surface reflectivity and altering the amount or characteristics of clouds), and 3) moderating specific impacts of global warming (e.g., efforts to limit sea level rise by
increasing land storage of
water, protecting ice sheets or artificially enhancing mountain glaciers).
On the other hand, decreasing stratospheric ozone (above 25 km),
increasing stratospheric
water vapor, and
increasing atmospheric CO2 uniformly with height) will produce global surface and tropospheric warming along with stratospheric cooling.
The important point here is that a small external forcing (orbital for ice - ages, or GHG plus aerosols & land use changes in the modern context) can be strongly amplified by the positive feedback mechanism (the strongest and quickest is
atmospheric water vapor - a strong GHG, and has already been observed to
increase.
The significant difference between the observed decrease of the CO2 sink estimated by the inversion (0.03 PgC / y per decade) and the expected
increase due solely to rising
atmospheric CO2 -LRB--0.05 PgC / y per decade) indicates that there has been a relative weakening of the Southern Ocean CO2 sink (0.08 PgC / y per decade) due to changes in other
atmospheric forcing (winds, surface air temperature, and
water fluxes).
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
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
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
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
water vapor, the peak of the distribution of
water vapor amo
water vapor amounts.
The only way that the oceans will outgas carbon dioxide would be for the
water temperature to
increase, without an
increase in
atmospheric concentrations.
Although data are not complete, and sometimes contradictory, the weight of evidence from past studies shows on a global scale that precipitation, runoff,
atmospheric water vapor, soil moisture, evapotranspiration, growing season length, and wintertime mountain glacier mass are all
increasing.
Thus, if the absorption of the infrared emission from
atmospheric greenhouse gases reduces the gradient through the skin layer, the flow of heat from the ocean beneath will be reduced, leaving more of the heat introduced into the bulk of the upper oceanic layer by the absorption of sunlight to remain there to
increase water temperature.
The
atmospheric flux of
water vapor and the associated convergence and divergence
increase in amplitude.
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.
Given that
atmospheric water - holding capacity is expected to
increase roughly exponentially with temperature — and that
atmospheric water content is
increasing in accord with this theoretical expectation (6 — 11)-- it has been suggested that human influenced global warming may be partly responsible for
increases in heavy precipitation (3,5,7).
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.
George E. Smith says: «Did I get that correct; it WAS you who recently posted at WUWT to the effect, that Clausius - Clapeyron, predicts a 7 %
increase in
atmospheric water content for a one deg C Temperature rise; as found experimentally by Wentz et al..»
Did I get that correct; it WAS you who recently posted at WUWT to the effect, that Clausius - Clapeyron, predicts a 7 %
increase in
atmospheric water content for a one deg C Temperature rise; as found experimentally by Wentz et al..
The
increased warmth allows the atmosphere to hold more
water vapour so that total
atmospheric density
increases and the
atmospheric greenhouse effect strengthens.
During times of warmth, the ocean
water levels rise as
atmospheric moisture
increases but at a rate decelerating when
atmospheric temperatures over oceans approach say 33 C.
The additional
atmospheric water vapour implies
increased moisture availability for precipitation.