 |
| Titel |
Origin and magnitude of low latitude terrestrial precipitation and temperature anomalies during Heinrich events and deglaciation |
| VerfasserIn |
T. H. Donders, H. J. de Boer, W. Finsinger, E. C. Grimm, S. C. Dekker, G. J. Reichart, F. Wagner-Cremer |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250020883
|
|
|
|
|
|
| Zusammenfassung |
| Repetitive phases of increased pine at Lake Tulane, Florida have previously been related to
strong stadials terminated by so-called Heinrich events. The climatic significance of
these pine phases has been interpreted in different ways. Using a pollen-climate
inference model, we quantified the climate changes and consistently found mean
summer precipitation (PJJA) increases (0.5-0.9 mm/day) and mean November
temperature increases (2.0-3.0∘C) that are coeval with Heinrich events and the
Younger Dryas. Comparison with marine sea surface temperature records point to a
potential source for these heat and moisture anomalies in the Gulf of Mexico or the
western tropical Atlantic. A climate model sensitivity analysis indicates that a positive
heat anomaly in the Gulf of Mexico and equatorial Atlantic best approximates the
pollen-inferred climate reconstructions from Lake Tulane during the Heinrich events
and Younger Dryas. We explain the low latitude warming by an increased Loop
Current facilitated by the persistence of the Atlantic Warm Pool during summer. |
|
|
|
|
|
|