Solar Amplification question cracked?

Discussion in 'Environment' started by westwall, Aug 4, 2010.

  1. westwall
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    westwall USMB Mod Staff Member Gold Supporting Member Supporting Member

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  2. Old Rocks
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    Old Rocks Diamond Member

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    Except that the TSI has been going down for the last 50 years. Just a little detail, you know. So why have we not entered a Little Ice Age?

    Walleyes, you faux geologist, when are you going to post something from real scientists? Oh, that right, you did twice in a row now, and what they said was that global warming is worse than we thought. Hmmmmm.......
     
  3. westwall
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    westwall USMB Mod Staff Member Gold Supporting Member Supporting Member

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    Care to post links to those claims there old fraud.
     
  4. Old Rocks
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    Old Rocks Diamond Member

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  5. Old Rocks
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    Old Rocks Diamond Member

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    If you go to this site, you can clearly see that the last 10 years has seen a decrease in TSI. The prior post showed a graph based on surface data, this article is concerned with the much more accurate satellite data.

    Solar Irradiance Variation | Imperial College London Astrophysics

    There are now nearly three 11-year solar cycles of data and observations from several different satellites have been composited to produce a continuous data set of TSI ranging from 1978 to the present data. There are differences between composites and this highlights an inherent uncertainty and the possibility that changes between minima may be possible. However, what is clear from all composites is that during maxima both overall TSI and variability is higher, due to facular coverage and spot transits respectively. Very large sunspot groups cause short decreases in TSI of over 0.2% but the impact of facular and network regions for periods longer than weeks compensates this and TSI increases by 0.1% between minima and maxima (see Figure 4).





    Fig. 4: The PMOD composite (adapted from Frohlich, 2009). Short sharp drops in the daily data (red) are the result of sunspot passages. The running mean (black line) shows a clear increase of 0.1% over an 11-year cycle.



    The creation of a long-term UV data set is also difficult. Absolute irradiance offset and degradation corrections remain an issue, but each instrument also has a different resolution: if rapidly varying features are not sufficiently resolved they may not be present in some data sets and determining variation is more difficult. Nevertheless, observations of the UV over the past three decades has revealed complex spectral behaviour and wavelength dependent contribution to TSI change. As with TSI, variability and irradiance increases at solar maximum above atmosphere observations have revealed that the 200-300 nm region varies on the order of a few percent, 150-200 nm by 10-20% and shorter regions by over 50%. However, contribution to TSI is tiny in this region: most radiative energy comes from the visible and near-IR and prior to the SORCE mission was a region not well observed.
     
  6. Old Rocks
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    Now care to post for the rest of us some real scientists that state the TSI is increasing? Or do you believe that a declining TSI is responsible for the observed warming?
     

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