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| Titel |
ENSO flavors in a tree-ring δ¹⁸O record from Indonesia |
| VerfasserIn |
Karina Schollaen, Christina Karamperidou, Gerhard Helle |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250090322
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| Publikation (Nr.) |
 EGU/EGU2014-4550.pdf |
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| Zusammenfassung |
| The existence of so-called ENSO flavors (Cold Tongue and Warm Pool El Nino), their
underlying mechanisms and potential changes in their frequency of occurrence is an active
field of research in the climate science community. Previous work has shown the distinct
teleconnection patterns of ENSO flavors and SST, precipitation and salinity in the tropics,
which should be taken into account when interpreting palaeo-climate proxies. At the same
time, proxies from key locations with distinct ENSO-flavors signals can provide long
continuous records, essential for identifying possible trends and (multi)decadal variability of
ENSO flavor occurrence. Here, we show that one such key region is Java (Indonesia), where
the ENSO influence on precipitation is significant for Warm Pool ENSO, and non-significant
for Cold Tongue ENSO. We do so by investigating the ENSO signal in a 108-year
long (1900-2007) tree-ring δ18O record of teak (Tectona grandis) trees growing
in a lowland rain forest in Central Java. Climate response analysis with regional
monthly rainfall data reveals that the tree-ring δ18O record is significantly correlated to
rainfall, and is sensitive to the occurrence of Warm Pool ENSO events, as well as La
Nina events. The results presented here demonstrate the ability of tree-ring stable
isotope records to provide palaeo-climate records able to distinguish between the
two ENSO flavors, with broad applicability to studies on past ENSO variability. |
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