Sentences with phrase «irradiance variation for»
The solar constant varies, but by the same % irradiance variation for each freq band.
http://reanalyses.org/
It misses the point when it comes to the earth's climate's non-linear response to solar irradiance variation for example, though.
Not exact matches
Solar irradiance modulation of Equator - to - Pole (Arctic) temperature gradients: Empirical evidence for climate variation on multi-decadal timescales
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.
Jim Cross (268)-- Somewhere I came across a paper showing that variations in solar irradiance proxies, sunspots and Be10, for other than the sunspot pseudoperiodic «cycle», are best explained as random events.
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.
The Group Sunspot number R Gs is a proxy for the variable irradiance component and for the toroidal field variations.»
They claim that the evidence for Milankovitch forcing of the ice ages implies that the planet is hypersensitive to solar irradiance variations.
Oceanic oscillations are sufficient to cancel out or enhance the effects of natural variations in solar irradiance or other forms of solar input to the heat budget of the Earth for variable periods of time.
(See Soon & Legates 2013: Solar irradiance modulation of Equator - to - Pole (Arctic) temperature gradients: Empirical evidence for climate variation on multi-decadal timescales.)
Parsimony is not a grounds for ignoring the now mountain of evidence that solar activity does somehow drive climate much more powerfully than can be explained by the tiny variation in solar irradiance, and the implications of a solar explanation for 20th century warming are much different than for an internal - variation explanation.
«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.
Soon, W. and D.R. Legates, 2013: Solar irradiance modulation of equator - to - pole (Arctic) temperature gradients: empirical evidence for climate variation on multi-decadal timescales, Journal of Atmospheric and Solar - Terrestrial Physics 93: 45 — 56.
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.
They noted that empirical models based upon sunspots and faculae do not account for all irradiance variations observed over an activity cycle (see also NRC (1994)-RRB- and base their con - elation on an observed relationship between brightness and excess chromospheric emission, using the Ca II H and...»
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.»
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.
For the period after 1974, the model makes use of the full - disc magnetograms of the Sun and reproduces up to 97 % of the measured irradiance variation.
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.
This provides strong support for the hypothesis that solar irradiance variations are caused by changes in the amount and distribution of magnetic flux at the solar surface.
The model assumes that solar irradiance variations are caused by surface magnetism and its single free parameter is kept at the same value for both cycles.
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
The satellite total solar irradiance (TSI) database provides a valuable record for investigating models of solar variation used to interpret climate changes.
Variable solar irradiance as a plausible agent for multidecadal variations in the Arctic - wide surface air temperature record of the past 130 years.Geophys.
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.
Solar Irradiance Modulation of Equator - to - Pole (Arctic) Temperature Gradients: Empirical Evidence for Climate Variation on Multi-decadal Timescales
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).