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| Titel |
Glacial-interglacial variability change: a view beyond ice cores |
| VerfasserIn |
Kira Rehfeld, Thomas Münch, Sze Ling Ho, Thomas Laepple |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250106654
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| Publikation (Nr.) |
 EGU/EGU2015-6331.pdf |
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| Zusammenfassung |
| The last Glacial was characterized by a highly variable climate, including abrupt changes
such as Heinrich- and Dansgaard-Oeschger events. By contrast, the warm Holocene time
period appears as relatively stable. This variability change is often discussed based on data
from polar ice cores, particularly from Greenland. Here, we contrast the polar ice-core based
variability change with the variability change as recorded by a global compilation of marine
and terrestrial proxy records.
Accounting for uneven sampling in time and space, we develop an understanding of proxy
signal-to-noise ratios which allows insight into proxy-specific biases concerning the
recording of climate variability. Globally, we find climate around the Last Glacial Maximum
five times more variable than during the Holocene. This variability is expressed in particular
by the polar ice cores: We find a stronger polar amplification of climate variability during the
Glacial than during the warm Holocene.
Our results indicate that the view of an extremely variable Glacial contrasting with a quiet
Holocene, given by central Greenland ice core isotope ratios, may underestimate the actual
variability of the present warm Interglacial on the global scale. |
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