Sentences with phrase «increased low cloud»

The question isn't whether increased Low Cloud Cover (LCC) provides a negative feedback, but whether LCC increases, where it increases, and what HCC does.

«However, the decrease in reflected SW radiation from the 1980s to the 1990s may be inconsistent with the increase in total and low cloud cover over oceans reported by surface observations (Norris, 2005a), which show increased low cloud occurrence.

Increasing low cloud extent is expected to cool climate, based on our best understanding at present.

Not exact matches

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As influence from low pressure approaching far to north increases, morning low clouds and fog will make it back into the local area, late in the week.

How would using cloud systems change the way government works?We are very supportive of using cloud technology in the government; we believe it will reduce costs, increase efficiency and lower barriers to entry.

This is what's known about the dynamics of the stratosphere: Increasing clouds of low - lying ozone, made from the reaction between sunlight and pollution, are showing up in the western U.S. that have little or no industrial activity.

Although lower, thicker storm clouds and increased wind shear don't directly cause tornadoes, they have been shown to intensify a tornado's strength if one does form.

Other studies analyzing satellite data from the International Satellite Cloud Climatology Project (ISCCP), the Advanced Very High Resolution Radiometer (AVHRR), and the Clouds and the Earth's Radiant Energy System (CERES) such as Chang and Coakley (2007) and Eitzen et al. (2008) have indicated that cloud optical depth of low marine clouds might be expected to decrease with increasing temperaCloud Climatology Project (ISCCP), the Advanced Very High Resolution Radiometer (AVHRR), and the Clouds and the Earth's Radiant Energy System (CERES) such as Chang and Coakley (2007) and Eitzen et al. (2008) have indicated that cloud optical depth of low marine clouds might be expected to decrease with increasing temperacloud optical depth of low marine clouds might be expected to decrease with increasing temperature.

Increasing evidence suggests that urban heat island effects extend to changes in precipitation, clouds and DTR, with these detectable as a «weekend effect» owing to lower pollution and other effects during weekends.

They tend to believe that as the planet warms, low - level cloud cover will increase, thus increasing planetary albedo (overall reflectiveness of the Earth), offsetting the increased greenhouse effect and preventing a dangerous level of global warming from occurring.

[Response: weaker cosmic ray flux - > fewer low clouds - > decrease in sunlight reflected back to space), then you need to explain why the night temperatures appear to increase faster then day temperatures (for any amplification mechanism involving te albedo, you'd expect the opposite, as there is no sunlight to reflect on the dark side of the planet...).

Our general circulation model simulations, which take into account the recently observed widespread occurrence of vertically extended atmospheric brown clouds over the Indian Ocean and Asia3, suggest that atmospheric brown clouds contribute as much as the recent increase in anthropogenic greenhouse gases to regional lower atmospheric warming trends.

«Global mean time series of surface - and satellite - observed low - level and total cloud cover exhibit very large discrepancies, however, implying that artifacts exist in one or both data sets... The surface - observed low - level cloud cover time series averaged over the global ocean appears suspicious because it reports a very large 5 % - sky - cover increase between 1952 and 1997.

If the climate sensitivity is low, for example due to increasing low - lying cloud cover reflecting more sunlight as a response to global warming, then how can these large past climate changes be explained?

Possible reasons include increased oceanic circulation leading to increased subduction of heat into the ocean, higher than normal levels of stratospheric aerosols due to volcanoes during the past decade, incorrect ozone levels used as input to the models, lower than expected solar output during the last few years, or poorly modeled cloud feedback effects.

Implementing SkillBuilder, a cloud - based learning management system, ensures a fast deployment, lower costs and increased return on investment (ROI).

These extended periods of cloudiness are usually a consequence of a weak area of low pressure above the marine layer which increases its depth, making it more difficult for surface heating to evaporate the clouds within it.

By late afternoon, the wind increases and begins to cool the onshore marine layer, allowing the fog and low clouds offshore to progress inland without evaporating.

Under these conditions, low - level cloud cover and its reflection of solar radiation increase, despite an increase in global mean surface temperature.

In general, models suggest that they are a positive feedback — i.e. there is a relative increase in high clouds (which warm more than they cool) compared to low clouds (which cool more than they warm)-- but this is quite variable among models and not very well constrained from data.

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).

Large patches N & S from the equatorial band haw lower cloudiness, and the SST falls and clouds increase as you move towards the poles.

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?

The idea was that the resulting increase in aerosol would increase the brightness and lifetime of low maritime clouds, increasing the planetary albedo.

By the way, low clouds in darkness increase surface temperature, sort of like the inverse property of commonly understood Cosmic ray effect, not causing a cooling because there are more CR's, but rather a warming, which only low clouds in total darkness can do, so the probable CR temperature signal gets cancelled from one latitude dark vs bright region to the next.

The working hypothesis of the cosmic ray crowd is that the (weak) correlations between low clouds and cosmic rays are causal (i.e. a cosmic ray increase — due to a solar magnetic field weakening — causes low clouds to increase, cooling the planet).

«During the 1997 — 1998 El Niño, observations indicate that the SST increase in the eastern tropical Pacific enhances the atmospheric convection, which shifts the upward motion to further south and breaks down low stratiform clouds, leading to a decrease in low cloud amount in this region.

He provides calculatons and data to support the hypothesis that an increase in low level clouds above 75 degree South, can produce warming.

Taking into account the obscuring effects of high cloud, it was found that thick low clouds decreased by more than 20 % in the eastern tropical Pacific... In contrast, most increase in low cloud amount due to doubled CO2 simulated by the NCAR and GFDL models occurs in the subtropical subsidence regimes associated with a strong atmospheric stability.»

Such results point to decreases in low - cloud optical thickness with warming in warm enviromnents and increases in cold ones.

This is opposite to lower latitudes, where an increase in low level clouds, results in cooling.

Net cooling for an increase in low cloud and vice versa.

Just two remarks: you keep on saying that the effect of increased cloudiness «should be warming», whereas the data shown in the article clearly show the opposite (more clouds cause lower surface level air temperatures).

Higher clouds are an expected effect of warming, and to first order, independent of GCRs — see ftp://eos.atmos.washington.edu/pub/breth/papers/2007/Zhu-etal-LowCldClimSens-JGR-2007.pdf Note the increase in high clouds (Fig2b3) and decrease in low clouds (Fig2e1) downwind of S America in the equatorial trade winds..

The required cloud increase depends on cloud height and would be of the order of 1 % global coverage for low clouds (i.e., 2 to 5 % over land).

Albedo from medium / low level clouds warms or cools the ocean surface by increasing or decreasing over time across the global surface.

If low - cloud cover increases as the climate warms, the warming is muted by the additional reflection of sunlight.

And, as the satellite observations of Spencer and Braswell showed, as the planet warms over a period of several months, clouds act as a net negative feedback (the reflecting low - altitude clouds increase more than the absorbing high - altitude clouds with warming).

goodsprk: It relies on not simply CO2, but on feedback from increased CO2 raising the temperature which increases the water vapor in the atmosphere which the alarmist assume will actually breaking up the low level clouds and forming high level cirrus clouds that will trap more heat.

It relies on not simply CO2, but on feedback from increased CO2 raising the temperature which increases the water vapor in the atmosphere which the alarmist assume will actually breaking up the low level clouds and forming high level cirrus clouds that will trap more heat.

Our general circulation model simulations, which take into account the recently observed widespread occurrence of vertically extended atmospheric brown clouds over the Indian Ocean and Asia, suggest that atmospheric brown clouds contribute as much as the recent increase in anthropogenic greenhouse gases to regional lower atmospheric warming trends.

Even under optimistic assumptions about computer performance continuing to increase exponentially, we estimate that climate models resolving low clouds globally will not be available before the 2060s.

By contrast, models projecting a weak decrease or increase in low - cloud reflection indicate that CO2 concentrations may reach almost 600 ppm before the Paris threshold is crossed.

The excessive evaporation increase under warming with prescribed SST leads to an over-moistened MBL and distorted low - cloud responses to warming (e.g. Webb and Lock 2013).

Bony et al 2006 had stated that the «empirical» Klein and Hartmann (1993) correlation «leads» to a substantial increase in low cloud cover, which resulted in a «strong negative» cloud feedback.

Increased vertical and temporal resolutions are shown to lead to stronger boundary layer turbulence and reduction of low - cloud biases.

For some unexplained reason there have been a large number of coronal holes on the surface of the sun, in low latitude positions during solar magnetic cycle 24, however due to the reduction in the solar wind density the solar wind bursts have less effect on cloud modulation which explains why there has suddenly be an increase sea ice in the Antarctic, a recovery of sea ice in the Arctic, and an inhibiting of the formation of El Niño events.

Recent HIRS and ISSCP data show long term trends indicating reductions in low cloud cover and / or increase in the high cloud / low cloud ratios, consistent with positive feedback in the models.

One source of decadal change in low level cloud is the Pacific decadal variation — decreasing after 1976.77 in surface observations and increasing again after 1998 in surface, satellite and «Earthshine» observations.