New paper finds solar UV varies up to 100 percent during solar cycles, confirms solar amplification mechanism

Posted: October 23, 2013 by tallbloke in climate, cosmic rays, Electro-magnetism, Measurement, Solar physics

Big H/T to ‘Lord Beaverbrook’ for alerting us to this new post over at  The Hockeyschtick,. Good to see the lead author of this new paper, Dr Sandip Dhomse is working at my home town University of Leeds.


 A paper published today in Atmospheric Chemistry and Physics notes that solar UV radiation can vary up to 100% during solar cycles, that it is “well accepted” these large changes in UV significantly affect stratospheric ozone production, and thereby act as a solar amplification mechanism on temperatures.
The IPCC dismisses the role of the Sun in climate change by only modelling the tiny changes of the Total Solar Irradiance [TSI], while ignoring the large changes of up to 100% in the most energetic portion of the solar spectrum, the ultraviolet [UV] region. The UV spectrum also penetrates the deepest of any portion of the solar spectrum into the oceans [up to 100 meters] to heat the bulk of the oceans, unlike longwave infrared radiation from greenhouse gases, which can only penetrate a few millionths of one meter to cause evaporative cooling of the ocean ‘skin’ surface.
From the Introduction to the paper:

The Sun is the primary source of energy to the Earth’s atmosphere, so it is essential to understand the influence that solar flux variations may have on the climate system. This can be studied by investigating the effect of 11 yr solar flux variations on the atmosphere. Although total solar irradiance (TSI) shows only a small variation ( 0.1% per solar cycle), significant (up to 100 %) variations are observed in the ultraviolet (UV) region of the solar spectrum. In a “top-down” mechanism, these UV changes are thought to modify middle atmospheric (lower mesospheric and stratospheric) O3 [ozone] production, thereby indirectly altering background temperatures (for a review see Gray et al., 2010). These temperature changes can then modulate upward propagating planetary waves, and amplify the solar signal in stratospheric O3 and temperatures. The temperature changes will also affect the rates of chemical reactions which control ozone. This mechanism has been well accepted.
Citation: Dhomse, S. S., Chipperfield, M. P., Feng, W., Ball, W. T., Unruh, Y. C., Haigh, J. D., Krivova, N. A., Solanki, S. K., and Smith, A. K.: Stratospheric O3 changes during 2001–2010: the small role of solar flux variations in a CTM, Atmos. Chem. Phys. Discuss., 13, 12263-12286, doi:10.5194/acpd-13-12263-2013, 2013.
Full paper available here
  1. Bloke down the pub says:

    So to what extent was the ozone hole related to solar uv levels?

  2. Frederick Colbourne says:

    The Terra carries ASTER, an instrument that scans several segments of the infra-red. What is striking is the lack of energy reflected to ASTER in the IR images, which appear black.

    So the energy is either absorbed by the top millimeter of the ocean or by the atmosphere or both. Can anybody comment?

  3. tallbloke says:

    Bdtb: Big time IMO

  4. craigm350 says:

    Lief S. “spurious, see my [ironed flat] presentation here” 🙂

  5. Doug Proctor says:

    Antarctica is losing mass while temperatures. Ultraviolet penetrates 100m into the ocean. Does UV penetrate further into ice, thereby providing a UV-dominated method of warming/sublimating glacial ice?

    Could the role of UV in continental ice loss be underestimated?

  6. hunter says:

    Doug, I am pretty certain that the claims you are referring to about Antarctic mass is from non-credible GRACE data.

  7. This is getting very close to my old suggestions;

    I’ve been proposing for some years that an active sun reduces ozone higher up and that the reduction higher up is more dominant than the previously observed increases lower down when the sun is active so that overall, ozone above the tropopause decreases when the sun is active.

    The reduction higher up being most dominant towards the poles.

    That gives the necessary reverse sign effect on ozone above the tropopause from solar influences that I said was necessary to produce more zonal jets when the sun is more active as per observations.

    It will be interesting to see how this develops.

  8. Scute says:

    Hunter (October 23, 4:30)

    Everything I’ve read about GRACE has said that it’s highly sensitive, from measuring the annual variation of freshwater in the Amazon basin to groundwater reserves under Iraq- unless NASA is being over optimistic. Was there a problem with the Antarctic data alone or are you doubtful of GRACE’s accuracy?

    Thanks, Scute

  9. Roger Andrews says:

    Scute: The raw GRACE data may indeed be highly sensitive, but like just about everything else they get “corrected”. And corrections like this don’t exactly give one a warm and fuzzy feeling:

  10. suricat says:

    Hey! What do you know TB!

    Do you still remember when the “channel 4 ‘eve’ website” was still ‘up and running’ years ago?

    If you do, you’ll recollect how I claimed that UV was instrumental in causing temperature change (‘Steve M’ was ‘sceptical’, ‘Son of Mulder’ was ‘indifferent’ and ‘another female participant’ (who’s ‘online tag’ escapes me) was most inquiring.

    It just gives me satisfaction to know that this ‘line of inquiry’ is ‘ongoing’. 🙂

    Best regards, Ray.

  11. suricat says:

    Sorry TB. I didn’t ‘close the brackets’ properly.

    Best regards, Ray.

  12. tallbloke says:

    Ray: CH4 ‘Eve’ website? Tell me more.

  13. Scute says:

    Roger Andrews:

    Thanks. Scary graph- it’s like the temperature adjustments but even worse.

  14. suricat says:

    tallbloke says: October 24, 2013 at 8:34 am

    “Tell me more.”

    I assume this remark is ‘rhetorical’?

    Best regards, Ray.

  15. suricat says:

    tchannon says: October 25, 2013 at 10:21 am

    “This fits with” :-

    Thanx for the link TC, but this goes ‘way back’. 🙂

    Best regards, Ray.

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