Sentences with phrase «past irradiance variations»

First, this is possible because helioseismic data provide the most precise measure ever of the solar cycle, which ultimately yields more profound physical limits on past irradiance variations.

Not exact matches

Changes in insolation are also thought to have arisen from small variations in solar irradiance, although both timing and magnitude of past solar radiation fluctuations are highly uncertain (see Chapters 2 and 6; Lean et al., 2002; Gray et al., 2005; Foukal et al., 2006).

Tying those factors together in order to estimate solar irradiance variations in the past is crucial for attributing past climate changes, particularly in the pre-industrial.

We only have direct observations of total solar irradiance (TSI) since the beginning of the satellite era and substantial evidence for variations in the level of solar activity (from cosmogenic isotopes or sunspot records) in the past.

See e.g. this review paper (Schmidt et al, 2004), where the response of a climate model to estimated past changes in natural forcing due to solar irradiance variations and explosive volcanic eruptions, is shown to match the spatial pattern of reconstructed temperature changes during the «Little Ice Age» (which includes enhanced cooling in certain regions such as Europe).

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...

Soon, W., 2005: Variable solar irradiance as a plausible agent for multidecadal variations in the Arctic - wide surface air temperature record of the past 130 years, Geophysical Research Letters32: doi.10.1029 / 2005GL023429.

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.

During the past 10000 years, the Sun has experienced the substantial variations in activity and there have been numerous attempts to reconstruct solar irradiance.

6.11.1 Total Solar Irradiance 6.11.1.1 The observational record 6.11.1.2 Reconstructions of past variations of total solar irradiance 6.11.2 Mechanisms for Amplification of Solar Forcing 6.11.2.1 Solar ultraviolet variation 6.11.2.2 Cosmic rays Irradiance 6.11.1.1 The observational record 6.11.1.2 Reconstructions of past variations of total solar irradiance 6.11.2 Mechanisms for Amplification of Solar Forcing 6.11.2.1 Solar ultraviolet variation 6.11.2.2 Cosmic rays irradiance 6.11.2 Mechanisms for Amplification of Solar Forcing 6.11.2.1 Solar ultraviolet variation 6.11.2.2 Cosmic rays and clouds

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.

Variable solar irradiance as a plausible agent for multidecadal variations in the Arctic - wide surface air temperature record of the past 130 years.Geophys.

W. Soon, «Variable solar irradiance as a plausible agent for multidecadal variations in the Arctic - wide surface air temperature record of the past 130 years», Geophysical Research Letters, 32, doi.10.1029 / 2005GL023429 (2005).