Sentences with phrase «irradiance variations with»

Not exact matches

On the other hand, Esper's data appear to be in close agreement with variations in cosmogenic isotopes whose production rates are indicators of variation in solar irradiance, and thus, global temperatures on Earth.

Typhoon variability was likely modulated further by the state of the East Asia summer monsoon (EASM) pattern, associated with variation in the magnitude of solar irradiance.

...» We describe the variations with time of the solar irradiance and of the flux of ejected magnetised plasma.

Recent sun - cloud connections have a decreasing correlation with CRF, but a good correlation between (low) clouds and solar irradiance, see figure 1 in http://folk.uio.no/jegill/papers/2002GL015646.pdf Also in the 6 May 2005 Science, there is an article which finds a long - term link between solar intensity (based on 14C variations) and monsoon intensity over the past 9000 years...

re # 6 I agree with you, Alastair, if [deltaT] 2xCO2 is 3 °C, 0,5 °C from solar irradiance variation doesn't matter.

Or, even more broadly, we know there's approx. 0,1 % variation of solar irradiance between two cycles minima (Willson 2003), how do we exclude with reasonable confidence the hypothesis that there is a 1 % variation between 21.000 y BP and 1750 AD?

These warming trends are consistent with the response to increasing greenhouse gases and sulphate aerosols and likely can not be explained by natural internal climate variations or the response to changes in natural external forcing (solar irradiance and volcanoes).

«Since irradiance variations are apparently minimal, changes in the Earth's climate that seem to be associated with changes in the level of solar activity — the Maunder Minimum and the Little Ice age for example — would then seem to be due to terrestrial responses to more subtle changes in the Sun's spectrum of radiative output.

«All 18 periods of significant climate changes found during the last 7,500 years were entirely caused by corresponding quasi-bicentennial variations of [total solar irradiance] together with the subsequent feedback effects, which always control and totally determine cyclic mechanism of climatic changes from global warming to Little Ice Age.»

Solar forcing is the only known natural forcing acting to warm the climate over this period but it has increased much less than greenhouse gas forcing, and the observed pattern of long term tropospheric warming and stratospheric cooling is not consistent with the expected response to solar irradiance variations.

http://www.agci.org/docs/lean.pdf «Global (and regional) surface temperature fluctuations in the past 120 years reflect, as in the space era, a combination of solar, volcanic, ENSO, and anthropogenic influences, with relative contributions shown in Figure 6.22 The adopted solar brightness changes in this scenario are based on a solar surface flux transport model; although long - term changes are «50 % larger than the 11 - year irradiance cycle, they are significantly smaller than the original estimates based on variations in Sun - like stars and geomagnetic activity.

We find that most of the solar cycle variation in the total solar irradiance can be accounted for by the absolute magnetic field strength on the solar disk, if fields associated with dark and bright regions are considered separately.

This is in agreement with the recent results of [CITE], but it is in contrast to the earlier analysis of [CITE], and suggests that the source of the irradiance variations is the same for cycles 22 and 23, namely the evolution of the magnetic flux at the solar surface.

There is a further and more fundamental issue with the satellite cloud data that makes any claim of a connection between low - cloud properties and solar activity highly suspect: we argue that it is not possible to accurately determine low cloud variations from satellite - based irradiance techniques.

They all have two things in common: 1) almost all show wide temperature variations in sync with solar activity (note here I write «activity» and not «irradiance», and it sure would be nice if warmist scientists some day learned the difference) and 2) they all disagree with the IPCC CO2 - centric computer simulations.

There have been numerous research papers and reviews published over the past 10 years, including several in prestigious journals such as Nature and Science, that conclude that the observed temperature changes over the past 100 years are consistent with the combined changes in atmospheric aerosols (volcanic and anthropogenic), land surface changes, variations in solar irradiance and increases in greenhouse gases.

With this new study have we not reached the point at which the level of variation in radiative flux approaches the level of variation in solar irradiance?