Sentences with phrase «total irradiance variations»

Not exact matches

Dr. Benestad states: «From regression analysis cited by the authors (Douglass and Clader 2002, White et al. 1997), it seems possible that the sensitivity of global surface temperature to variations of total solar irradiance might be about 0.1 K / Wm -2.

Flood layer frequency in the Ammersee sediment record depicts distinct multi-decadal variations and significant correlations to a total solar irradiance reconstruction (r = − 0.4, p < 0.0001) and 14C production rates (r = 0.37, p < 0.0001), reflecting changes in solar activity.

Contributions from the following topics (but not exclusively) are invited: • Solar irradiance and energetic particle impacts on the atmosphere • Upper atmospheric dynamical variability and coupling between atmospheric layers • Solar variations and stratosphere - troposphere coupling • Solar influence on climate variability • Solar irradiance (spectral and total irradiance) variations

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.

Because of the variations of sunspots and faculae on the sun's surface, the total solar irradiance (TSI), also called the solar constant, varies on a roughly 11 - year cycle by about 0.07 %, which has been measured by orbiting satellites since 1978 [Lean, 1987, 1991; Wilson et al., 1981].

However, it is not the variation in the TSI (total solar irradiance) which is causing the change.

The Holy Grail of climatology has always been to ascertain whether, and if so how, the sun might affect the Earth's energy budget to cause the climate swings observed throughout history despite the apparent inadequacy of the tiny variations in Total Solar Irradiance (TSI) that occur from one series of solar cycles to another.

The solar effect on climate has been discounted by the climate modellers because the variation in total solar irradiance...

The NCEP model is forced by spectral irradiances but, if i understood correctly, the solar cycle variation refers to total solar irradiance only.

A third example would be the research on how incoming solar irradiance influences China's thermometer temperature records, showing that over periods of many decades the variations in total solar irradiance in the upper atmosphere are matched by variations at the surface.

This high climate sensitivity is not alone due to variations in total solar irradiance - related direct solar forcing, but also due to additional, so - called indirect solar forcings.

We also show that a non-thermal solar component is necessarily present, indicating that the total solar contribution to the 20th century global warming, of ∆ Tsolar = 0.27 ± 0.07 ◦ C, is much larger than can be expected from variation in the total solar irradiance alone.

In the summary of Chapter 7, one can read that the effects of variation in solar radiation are negligible You seem to miss the whole point.: «The Chapter 7 authors are admitting strong evidence («many empirical relationships») for enhanced solar forcing (forcing beyond total solar irradiance, or TSI), even if they don't know what the mechanism is.»

There could also be other unknown mechanisms driven by solar changes that exaggerate the effect of small variations in total solar irradiance.

Figure 1 (a) represents the corrected visible light from Neptune from 1950 to 2006; (b) shows the temperature anomalies of the Earth; (c) shows the total solar irradiance as a percent variation by year; (d) shows the ultraviolet emission from the Sun (Source: Hammel and Lockwood (2007)-RRB-.

«Over the 11 - year solar cycle, small changes in the total solar irradiance (TSI) give rise to small variations in the global energy budget.

«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.»

Although we focus on a hypothesized CR - cloud connection, we note that it is difficult to separate changes in the CR flux from accompanying variations in solar irradiance and the solar wind, for which numerous causal links to climate have also been proposed, including: the influence of UV spectral irradiance on stratospheric heating and dynamic stratosphere - troposphere links (Haigh 1996); UV irradiance and radiative damage to phytoplankton influencing the release of volatile precursor compounds which form sulphate aerosols over ocean environments (Kniveton et al. 2003); an amplification of total solar irradiance (TSI) variations by the addition of energy in cloud - free regions enhancing tropospheric circulation features (Meehl et al. 2008; Roy & Haigh 2010); numerous solar - related influences (including solar wind inputs) to the properties of the global electric circuit (GEC) and associated microphysical cloud changes (Tinsley 2008).

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.

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 and cTotal 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 and ctotal 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

The satellite total solar irradiance (TSI) database provides a valuable record for investigating models of solar variation used to interpret climate changes.

The RC articles have more detail than I have tried to stomach so far, but I understand that total solar irradiance is not the whole picture as variations in the proportions of energy at differing wave lengths also impacts many aspects of climate.

Stable detectors placed aboard satellites above the Earth's atmosphere have been precisely monitoring the Sun's total irradiance of the Earth since 1978, providing conclusive evidence for small variations in the solar constant.