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| Titel |
Climate hypersensitivity to solar forcing? |
| VerfasserIn |
W. Soon, E. Posmentier, S. Baliunas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 18, no. 5 ; Nr. 18, no. 5, S.583-588 |
| Datensatznummer |
250013992
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| Publikation (Nr.) |
 copernicus.org/angeo-18-583-2000.pdf |
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| Zusammenfassung |
We compare the equilibrium climate responses
of a quasi-dynamical energy balance model to radiative forcing by equivalent
changes in CO2, solar total irradiance (Stot) and
solar UV (SUV). The response is largest in the SUV
case, in which the imposed UV radiative forcing is preferentially absorbed in
the layer above 250 mb, in contrast to the weak response from global-columnar
radiative loading by increases in CO2 or Stot. The
hypersensitive response of the climate system to solar UV forcing is caused by
strongly coupled feedback involving vertical static stability, tropical thick
cirrus ice clouds and stratospheric ozone. This mechanism offers a plausible
explanation of the apparent hypersensitivity of climate to solar forcing, as
suggested by analyses of recent climatic records. The model hypersensitivity
strongly depends on climate parameters, especially cloud radiative properties,
but is effective for arguably realistic values of these parameters. The proposed
solar forcing mechanism should be further confirmed using other models (e.g.,
general circulation models) that may better capture radiative and dynamical
couplings of the troposphere and stratosphere.
Key words: Meteorology and atmospheric dynamics (climatology
· general or miscellaneous) · Solar physics · astrophysics · and astronomy
(ultraviolet emissions) |
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