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4 years ago  ::  Oct 07, 2010 - 10:23AM #1
CharikIeia
Posts: 8,301

It looks like solar cycles are not in phase with solar irradiation influences on  climate. New research now reveals that while solar activity reached a minimum in 2009, the preceding strong decline in UV irradiation was accompanied by an increase in visible and infrared irradiation levels. In sum, the net effect on the earth's surface temperature could be estimated to amount to an increase of about a twentieth of a degree Celsius.


This finding, although based on a short record from a  potentially anomalous solar cycle, suggests that a major revision to our  current understanding of solar forcing of climate may be in order.


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Now I am curious to hear the solar hacks of the past years add their mustard to this...


Current understanding suggests that radiative forcings over the course  of an 11-year solar cycle are in phase with related influences on  climate. Recent satellite data have revealed, however, that there seems  to be a surprising spectral component to solar variability, at least in  the declining phase of the current solar cycle: UV radiation decreases  strongly while visible radiation increases. Joanna Haigh and colleagues  now show that these spectral variations — when incorporated into a  radiative-photochemical model — lead to decreases in ozone below 45  kilometres and increases above. As a consequence of the ozone changes,  radiative forcing of surface climate is out of phase with solar  activity. This finding, although based on a short record from a  potentially anomalous solar cycle, suggests that a major revision to our  current understanding of solar forcing of climate may be in order.
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