Sentences with phrase «caused global cloud»

He suggests that some unknown mechanism has caused global cloud cover to decrease over the past century.

Not exact matches

Almost simultaneous with the birth of discover, physicist and Nobel laureate Luis Alvarez (along with his son, Walter Alvarez of the University of California, Berkeley) proposed that a giant asteroid impact killed off the dinosaurs by causing global firestorms and dust clouds that blotted out the sun.

Scientists know that the clouds can act as a sunshield, cooling parts of the globe and offsetting the global warming caused by the greenhouse effect (see «Not warming, but cooling», New Scientist, 9 July 1994).

They found a small correlation between cosmic rays and global temperatures occurring every 22 years; however, the changing cosmic ray rate lagged behind the change in temperatures by between one and two years, suggesting that the cause of the temperature rise might not be attributable to cosmic rays and cloud formation, but could be caused by the direct effects of the sun.

There have been articles as far back as the 70s concerning global dimming but it's only very recently, apparently, that all of the probable causes (e.g. the microscopic particles causing smaller water droplets in clouds, enhancing the mirror effect, as well as contrails) have been understood.

The simulations confirm that aerosol injection does brighten clouds, but the amount of solar radiation reflected may not be enough to balance the global warming caused by burning fossil fuels.

My father is somewhat of a climate «sceptic» and insists that the prediction of 0.3 C cooling is based only on solar irradiance and does not take into account increased cloud cover caused by low sun activity (he beleives that we are going to be facing extreme global cooling over the next few decades).

due to co2 we are already living in a greenhouse.Whatever one does in that greenhouse will remain in the greenhouse.INDUSTRIOUS HEAT will remain in the greenhouse instead of escaping into outer space; this is a far greater contributor to global warming than other factors and far more difficult to reduce without reducing economic activity.Like warm moist air from your mouth on cold mornings so melting antarctic ice will turn into cloud as it meets warm moist air from tropics the seas will not rise as antarctica is a huge cloud generator.A thick band of cloud around the earth will produce even temps accross the whole earth causing the wind to moderate even stop.WE should be preparing for this possible scenario»

For cause and effect: You never know, but I don't think that cloud cover regulates the sun cycle... Globally, the variation of cloud cover during a sun cycle is around 2 %, which can have a substantial influence on global temperatures.

There have been articles as far back as the 70s concerning global dimming but it's only very recently, apparently, that all of the probable causes (e.g. the microscopic particles causing smaller water droplets in clouds, enhancing the mirror effect, as well as contrails) have been understood.

For example, episodic deviations in cloud and snow cover, dust and smoke, etc, will have some radiative effect that could cause some global average temperature change.

The second order effect of increasing cloudiness caused by more GCRs when «atmospheric conditions are suitable» for the formation of high clouds due to the other effects of global warming should be warming.

Roy Spencer is the driving force behind the «internal variability» hypothesis, which posits that some unknown and undefined mechanism is causing cloud cover to change, which, by changing the overall reflectivity of the Earth, is the driving force behind the current global warming.

And because cloud cover gates the Sun on and off, it is the most powerful feedback in all of Earth's climate to amplify solar variations and to mitigate global warming from any cause.

Cho, H. - M., Z. Zhang, K. Meyer, M. Lebsock, S. Platnick, A.S. Ackerman, L. Di Girolamo, L.C. Labonnote, C. Cornet, J. Riedi, and R.E. Holz, 2015: Frequency and causes of failed MODIS cloud property retrievals for liquid phase clouds over global oceans.

This empirical finding contradicts Spencer's hypothesis that cloud cover changes are driving global warming, but is consistent with our current understanding of the climate: ocean heat is exchanged with the atmosphere, which causes surface warming, which alters atmospheric circulation, which alters cloud cover, which impacts surface temperature.

The 1991 volcanic eruptions (Pinatubo, Hudson) injected 23 Megatonnes of SO2 into the stratosphere, leaving a sulfurous cloud that circled the globe for about 2 years before finally settling out (together with a large quantity of fine particulate matter which rapidly settled out) The sulfurous cloud caused average global temperatures to drop by 0.55 deg.

Clouds are one of the big unknowns about global warming as they can have a range of effects, warmer temperatures caused by global warming will result in higher rates of evaporation and therefore will result in higher cloud cover.

Something caused decreased cloud cover, less reflected SW and global warming in the late 20th century.

Nature also published a supporting companion article by the late Dr. Stephen Schneider, who used a global climate model to create a futuristic scenario that if CO2 doubled it «could» raise the clouds and «perhaps» cause a harmful drying effect.

«The overall slow decrease of upwelling SW flux from the mid-1980's until the end of the 1990's and subsequent increase from 2000 onwards appear to caused, primarily, by changes in global cloud cover (although there is a small increase of cloud optical thickness after 2000) and is confirmed by the ERBS measurements.»

Because it affects our ability to find the Holy Grail of climate research: cloud feedback... Sufficiently positive cloud feedback could cause a global warming Armageddon.

He has published two papers stating that climate change is not serious: a 2001 paper hypothesizing that clouds would provide a negative feedback to cancel out global warming, and a 2009 paper claiming that climate sensitivity (the amount of warming caused by a doubling of carbon dioxide) was very low.

A slight change of ocean temperature (after a delay caused by the high specific heat of water, the annual mixing of thermocline waters with deeper waters in storms) ensures that rising CO2 reduces infrared absorbing H2O vapour while slightly increasing cloud cover (thus Earth's albedo), as evidenced by the fact that the NOAA data from 1948 - 2008 shows a fall in global humidity (not the positive feedback rise presumed by NASA's models!)

(The consensus claim that the clouds that result cause an increase in global heat content, but since they don't really understand clouds by their own admission, I take that with a box of salt.)

New paper finds changes in cloud cover caused global brightening & dimming, not man - made aerosols

And noting «zonal mean - winds constitute an important element of global atmospheric circulation,» they go on to suggest,» if the solar cycle can influence zonal mean - winds, then it may affect other features of global climate as well, including oscillations such as the NAO and MJO, of which zonal winds are an ingredient» Thus, «the cause of this forcing» as they describe it, «likely involves some combination of solar wind, galactic cosmic rays, ionosphere - Earth currents and cloud microphysics.»

Lawrence Livermore National Laboratory researchers have identified a mechanism that causes low clouds — and their influence on Earth's energy balance — to respond differently to global warming depending on their spatial pattern.

If there is a strong negative feedback in the climate system, be it clouds, lapse rate, etc it would preclude large temperature variations in global temperature caused by a perturbation in climate, regardless of the cause of the perturbation

-LSB-...] caused the California fires» of 2007, even if Global Warming did fan the flames (see also Forest Chief Warns of Global Warming threat) nor is possible to say that Moscow's clouded skies last year were due to Climate Disruption -LSB-...]

The global electric current causes changes in cloud properties and precipitation which in turn causes warming in both locations.

«The overall slow decrease of upwelling SW flux from the mid-1980's until the end of the 1990's and subsequent increase from 2000 onwards appear to caused, primarily, by changes in global cloud cover (although there is a small increase of cloud optical thickness after 2000) and is confirmed by the ERBS measurements... The overall slight rise (relative heating) of global total net flux at TOA between the 1980's and 1990's is confirmed in the tropics by the ERBS measurements and exceeds the estimated climate forcing changes (greenhouse gases and aerosols) for this period.

Spencer has postulated elsewhere that natural factors, such as PDO swings, might be the underlying cause for changes in cloud cover, which result in changes in global temperature, IOW that clouds act as part of a natural forcing, rather than simply a feedback to anthropogenic (or other) forcing.

manacker, so your explanation is that the sun shines through the somehow thinning clouds and causes global warming.

Thus if the two mid latitude jets move equatorward at the same time as the ITCZ moves closer to the equator the combined effect on global albedo and the amount of solar energy able to penetrate the oceans will be substantial and would dwarf the other proposed effects on albedo from changes in cosmic ray intensity generating changes in cloud totals as per Svensmark and from suggested changes caused in upper cloud quantities by changes in atmospheric chemistry involving ozone which various other climate sceptics propose.

Misconception # 5 — Cosmic rays result in increased clouding, consequently periods of low cosmic ray flux cause global warming.

Nice bit of urban history, but the big question is what is causing global warming and even bigger question being why is everybody ignoring variability in equatorial cloud mass?

Increased equatorial insolation due to reduced Easterly Wave SC cloud mass, promoting increased northern hemisphere evaporation and precipitation resulting in a hiatus on a global averaging basis, but regional specific cause - and - effect variability?

On the other hand, Gavin Schmidt of NASA GISS, one of the topmost scientists involved in the Catastrophic Anthropogenic Global Warming cause, in a recent paper clearly asserts that: • 75 % of the Greenhouse effect is attributable to water vapour and clouds • 100 % of the increase in CO2 emissions since 1850 (110 ppmv) is Man - made Following these numbers through and accounting for the effect of other Greenhouse gases results in a Man - made temperature rise between 1850 and 2010 of 2.21 °C.

In that post, I looked into the ocean at 10 - 100m depth, and found enough extra energy absorption caused by a 1983 - 2009 cloud cover decline to match the global warming claimed for CO2.

Feedbacks involving low - level clouds remain a primary cause of uncertainty in global climate model projections.