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| Titel |
Millennial length summer sunshine reconstructions from stable carbon isotope ratios in tree rings from across Fennoscandia. |
| VerfasserIn |
Mary Gagen, Danny McCarroll, Eduardo Zorita, Giles Young, Risto Jalkanen, Neil Loader, Iain Robertson, Håkan Grudd, Andreas Kirchhefer |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250058116
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| Zusammenfassung |
| Cloud cover is one of the most important factors controlling the radiation balance of the
Earth. The response of cloud cover to increasing global temperatures represents the largest
uncertainty in model estimates of future climate because the cloud response is not
well-constrained. Here we a regional reconstruction of summer sunshine over the past
millennium, based on the stable carbon isotope ratios of pine treerings from Fennoscandia.
Comparison with the regional temperature evolution reveals the Little Ice Age to
have been sunny in its coldest periods. A negative short-wave cloud feedback is
indicated at high latitude. A millennial climate simulation indicates that regionally
low temperatures during the LIA were mostly maintained by a weaker greenhouse
effect due to lower humidity. Simulations of future climate that display a negative
short-wave cloud feedback for high-latitudes are consistent with our proxy interpretation. |
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