Sentences with phrase «changes in cloud cover due»

In short, the «skeptic» hypothesis that changes in cloud cover due to internal variability are driving global warming does not hold up when compared to the observational data.

Not exact matches

A new analysis using changes in cloud cover over the tropical Indo - Pacific Ocean showed that a weakening of a major atmospheric circulation system over the last century is due, in part, to increased greenhouse gas emissions.

Of course, there may be a change in AO index due to GHGs, maybe even as good as the influence of solar on the AO... Remains to be seen what will happen with temperatures and cloud cover if the AO index changes.

«we estimate that less than 23 %, at the 95 % confidence level, of the 11 - year cycle changes in the globally averaged cloud cover observed in solar cycle 22 is due to the change in the rate of ionization from the solar modulation of cosmic rays.»

While on the subject: Could I ask your take on Erlykin et al. 2011, in particular their finding that any effect of cosmic radiation is limited to 1 % of cloud cover, and their estimate that any temperature increase due to such a mechanism over the past 50 years of barely changing CR is limited to 0.002 °C?

Of course, there may be a change in AO index due to GHGs, maybe even as good as the influence of solar on the AO... Remains to be seen what will happen with temperatures and cloud cover if the AO index changes.

According to Chen ea., the difference is not due to changes in clear sky radiation (too small, which may point to small differences in water vapour column), but in cloud cover.

Re 9 wili — I know of a paper suggesting, as I recall, that enhanced «backradiation» (downward radiation reaching the surface emitted by the air / clouds) contributed more to Arctic amplification specifically in the cold part of the year (just to be clear, backradiation should generally increase with any warming (aside from greenhouse feedbacks) and more so with a warming due to an increase in the greenhouse effect (including feedbacks like water vapor and, if positive, clouds, though regional changes in water vapor and clouds can go against the global trend); otherwise it was always my understanding that the albedo feedback was key (while sea ice decreases so far have been more a summer phenomenon (when it would be warmer to begin with), the heat capacity of the sea prevents much temperature response, but there is a greater build up of heat from the albedo feedback, and this is released in the cold part of the year when ice forms later or would have formed or would have been thicker; the seasonal effect of reduced winter snow cover decreasing at those latitudes which still recieve sunlight in the winter would not be so delayed).

The changes in climate are due to the activity of the sun and variations in cloud cover.

In attempting to substantiate this internal variability hypothesis, Spencer & Braswell (2011) assumed that the change in top of the atmosphere (TOA) energy flux due to cloud cover changes from 2000 to 2010 was twice as large as the heating of the climate system through ocean circulatioIn attempting to substantiate this internal variability hypothesis, Spencer & Braswell (2011) assumed that the change in top of the atmosphere (TOA) energy flux due to cloud cover changes from 2000 to 2010 was twice as large as the heating of the climate system through ocean circulatioin top of the atmosphere (TOA) energy flux due to cloud cover changes from 2000 to 2010 was twice as large as the heating of the climate system through ocean circulation.

Ron de Haan (17:51:50): The changes in climate are due to the activity of the sun and variations in cloud cover.

Lindzen and Choi plot a time regression of change in TOA energy flux due to cloud cover changes vs. sea surface temperature changes.

Leif, «Ron de Haan (17:51:50): The changes in climate are due to the activity of the sun and variations in cloud cover.

This can be affected by warming temperatures, but also by changes in snowfall, increases in solar radiation absorption due to a decrease in cloud cover, and increases in the water vapor content of air near the earth's surface.2, 14,15,16,17 In Cordillera Blanca, Peru, for example, one study of glacier retreat between 1930 and 1950 linked the retreat to a decline in cloud cover and precipitation.in snowfall, increases in solar radiation absorption due to a decrease in cloud cover, and increases in the water vapor content of air near the earth's surface.2, 14,15,16,17 In Cordillera Blanca, Peru, for example, one study of glacier retreat between 1930 and 1950 linked the retreat to a decline in cloud cover and precipitation.in solar radiation absorption due to a decrease in cloud cover, and increases in the water vapor content of air near the earth's surface.2, 14,15,16,17 In Cordillera Blanca, Peru, for example, one study of glacier retreat between 1930 and 1950 linked the retreat to a decline in cloud cover and precipitation.in cloud cover, and increases in the water vapor content of air near the earth's surface.2, 14,15,16,17 In Cordillera Blanca, Peru, for example, one study of glacier retreat between 1930 and 1950 linked the retreat to a decline in cloud cover and precipitation.in the water vapor content of air near the earth's surface.2, 14,15,16,17 In Cordillera Blanca, Peru, for example, one study of glacier retreat between 1930 and 1950 linked the retreat to a decline in cloud cover and precipitation.In Cordillera Blanca, Peru, for example, one study of glacier retreat between 1930 and 1950 linked the retreat to a decline in cloud cover and precipitation.in cloud cover and precipitation.18

The Earth's albedo changes primarily due to cloud cover and perhaps other particulates in the atmosphere.

Spencer & Braswell (2011) assumed that the change in top of the atmosphere (TOA) energy flux due to cloud cover changes from 2000 to 2010 was twice as large as the heating of the climate system through ocean circulation.

As Roy Spencer points out, it doesn't take much of a change in cloud cover to account for global warming due to increased insolation * at the ocean surface *.

Dessler (2011) used observational data (such as surface temperature measurements and ARGO ocean temperature) to estimate and corroborate these values, and found that the heating of the climate system through ocean heat transport was 20 times larger than TOA energy flux changes due to cloud cover over the period in question.

In short, Dessler argues that cloud cover change is a feedback to a radiative forcing, for example increasing greenhouse gases, while Spencer argues that clouds are changing due to some other, unknown cause, and acting as a forcing themselves.

You have not cited a third possibility (out of the infinite range of possibilities), no climate change associated with CO2 (due to, for example, cloud cover providing negative feedback), with current increase due to natural variability; or how about possibility four, that increase in CO2 concentrations are caused by the temperature rise, which is in turn caused by (for example) increased solar activity resulting in increased biomass activity etc. etc..

This polar amplification is thought to be due largely to changes in sea ice, with some contributions from changes in snow cover, atmospheric and ocean circulation, cloud cover and the presence of soot.

The IPCC acknowledges three potential drivers of climate change: (1) changes in incoming solar radiation (e.g. due to changes in the Earth's orbit or the Sun); (2) changes in reflected solar radiation (e.g. due to changes in low - level cloud cover); and (3) changes in outgoing longwave radiation (e.g. due to changes in greenhouse gas concentrations).

This is due to the difficulty in distinguishing a cold, bright object (i.e., a cloud) from an ice or snow covered surface: as a result of these difficulties ISCCP has been noted to mistake temperature changes for cloud changes at high latitudes (Rossow & Schiffer 1999; Laken & Pallé 2012).

On top of that there are year to year fluctuation due to short term changes in humidity, cloud cover, surface temperature and change in temperature distribution which can be ignored for this discussion.

Moreover, a more careful look at the changes of ISCCP clouds by cloud type shows that the increase in total cloud cover from 2000 to 2004 is due to a small increases in high - level clouds and a larger increase in middle - level clouds that are mostly thermally neutral and therefore could not cause warming (see figures, data).

Changes in suitable plant growing days due to the interaction between solar radiation and soil moisture were minimal -LRB--2 %, 0 %, and 2 % under RCP 2.6, RCP 4.5, and RCP 8.5, respectively; dashed purple lines in Fig 3), although there was considerable spatial variability (Fig 2E) due to the coupling between rainfall and cloud cover.

It is logical to presume that changes in Earth's albedo are due to increases and decreases in low cloud cover, which in turn is related to the climate change that we have observed during the 20th Century, including the present global cooling.

This might cause changes in cloud cover, due to consequent reductions in relative humidity, so you have to stop those too because they are a feedback.

There are other problems with Norris (2004), such as the comparison of reconstructed cloud cover to trends from ISCCP, which according to Evan et al. (2007), are more likely due to a satellite viewing geometry artifact rather than physical changes in the atmosphere.