Sentences with phrase «solar irradiance»
Solar irradiance refers to the amount of energy from the Sun that reaches a specific area on Earth. It measures the intensity of sunlight and is an important factor in understanding solar energy and its impact on our planet. Full definition
We obtained a large historical solar forcing between the Maunder minimum and the present, as well as a significant increase in solar irradiance in the first half of the twentieth - century.
aanda.org
Total solar irradiance changes, though of small magnitude, do appear to affect sea surface temperatures (SSTs), most obviously at latitudes where cloud cover is small and irradiance is abundant, such as the Northern Hemisphere subtropics during summer.
We also demonstrate that SPM data can be employed to reconstruct total solar irradiance variations with almost the same accuracy as recently shown for MDI data.
Facts: It's not the sun («According to PMOD at the World Radiation Center there has been no increase in solar irradiance since at least 1978 when satellite observations began.
Let's set the stage by noting that, as a significant competitor to anthropogenic greenhouse forcing of recent climate change, the direct radiative forcing by solar irradiance variations is dead on arrival.
This is large, but still significantly less than the change in irradiance between the present and the Maunder minimum.Both reconstructions suggest a significant increase in the TSI during the first half of the twentieth - century as well as a low solar irradiance during the Maunder and Dalton minima.
The bottom line is that Wilson was not suggesting that solar activity is responsible for more warming than we think, or greenhouse gases less, but merely asking the question «what if models weight solar irradiance more strongly?»
Recent reduced solar irradiance (Fig. 7) may have decreased the forcing over the past decade by about half of the full amplitude of measured irradiance variability, thus yielding a negative forcing of, say, − 0.12 W / m2.
While the link between solar irradiance levels and warming is pretty straight forward, the cosmic ray cloud formation proposition is still in its infancy.
Amplification of the direct solar forcing is conceivable, e.g., through effects on ozone or atmospheric condensation nuclei, but empirical data place a factor of two upper limit on the amplification, with the most likely forcing in the range 100 — 120 % of the directly measured solar irradiance change [64].
Solar irradiance modulation of Equator - to - Pole (Arctic) temperature gradients: Empirical evidence for climate variation on multi-decadal timescales
The estimated difference between the present - day solar irradiance cycle mean and the Maunder Minimum is 0.08 % (see Section 2.7.1.2.2), which corresponds to a radiative forcing of about 0.2 W m — 2, which is substantially lower than estimates used in the TAR (Chapter 2).
We presented a new technique to reconstruct the total and spectral solar irradiance over the Holocene.
Certainly if we artificially weighted solar irradiance more strongly in the models, it could explain more of the early 20th Century warming (although for this exercise to be scientifically valid, we would have to come up with a physical justification for this larger solar weighting).
The colors in the map show the local solar irradiance averaged over three years from 1991 to 1993 (24 hours a day) taking into account the cloud coverage available from weather satellites.»
Bishop, J.K.B., W.B. Rossow, and E.G. Dutton, 1997: Surface solar irradiance from the International Satellite Cloud Climatology Project 1983 - 1991.
Long - term patterns of solar irradiance forcing in model experiments and proxy - based surface temperature reconstructions.
Add this to your list of articles and papers to read regarding sun exposure changes, meaning solar irradiance changes, I presume.
«Long - Term Solar Irradiance Variability During Sunspot Cycle 22.»
Increasing CO2 does increase the greenhouse effect, but there are other factors which determine climate, including solar irradiance, volcanism, albedo, orbital variations, continental drift, mountain building, variations in sea currents, changes in greenhouse gases, even cometary impacts.
The choice of the model for the minimum state of the Sun is a crucial point in our technique because it defines the amplitude of the reconstructed solar irradiance variability.
However, variability in ultraviolet solar irradiance has been linked to changes in surface pressure that resemble the Arctic and North Atlantic Oscillations (AO / NAO) 8,9,10 and studies of both the 11 - year solar cycle11, 12 and centennial timescales13 suggest the potential for larger regional effects.
Any solar effect (either direct or indirect) which is correlated to solar activity (i.e. solar irradiance, solar magnetic field [and thus galactic cosmic rays], ultraviolet [UV] radiation, etc.) is accounted for in the linear regression.