 |
| Titel |
A record of the Atlantic Multidecadal Oscillator in the sediment magnetic properties of Alpine lakes |
| VerfasserIn |
Luca Lanci, Ann M. Hirt |
| Konferenz |
EGU General Assembly 2013
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250078276
|
|
|
|
|
|
| Zusammenfassung |
| We analyze published magnetic properties of lake sediments from the Alpine region that were
previously interpreted as climate proxy records. The spectral analysis of these climate proxies
during the last ~ 2000 yr show a statistically significant frequency peak with a period of
about 50 yr, which is characteristic of the Atlantic Multidecadal Oscillator (AMO), a feature
defined by a persistent oscillations in North Atlantic sea-surface temperatures. We compare
the alpine lake records to Greenland ice core δ18O record where AMO-related
variability was recognized during the last 8000 yr by Knudsen et al. (2010) and
show that the filtered components of the relevant period form the Greenland record
correspond to that of the alpine records, within the precision of the available age
models. We conclude that AMO fluctuations played a significant role in pacing the
variability of the alpine rock-magnetic properties during the last ~ 2000 yr, possibly
by influencing the ratio between the authigenic and detrital magnetic particles. |
|
|
|
|
|
|