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| Titel |
Hydroclimate variability in the western Pacific warm pool during the past 60,000 years |
| VerfasserIn |
M. Yusuf Awaluddin, Mahyar Mohtadi, Gema Martinez-Mendez, Yair Rosenthal, Dierk Hebbeln |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250123861
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| Publikation (Nr.) |
 EGU/EGU2016-3187.pdf |
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| Zusammenfassung |
| The western Pacific warm pool (WPWP) is known as the heat engine for globe’s climate
system which fuel atmospheric convection and influence tropical and subtropical climate.
This region also hosts the Mindanao Current which transports the North Pacific surface
water to the equator and feeds the Indonesian Throughflow. Here we reconstruct the
hydroclimate evolution of the WPWP since 60,000 years ago to assess its relation
to dominant climatic forcing using sediment core GeoB17405-3 (08o00.281’ N,
126o37.146’ E, 880 m water depth) collected from the edge of WPWP off east
Mindanao. We use shell stable oxygen isotope and Mg/Ca in planktic foraminifera
to reconstruct SST, sedimentation rates and Ti/Ca ratios to reconstruct changes
in terrigenous runoff, and seawater δ18O (δ18Osw) as a measure of sea surface
salinity.
SST shows small-scale variability during Marine Isotope 3 (MIS 3) around 27,2 oC, with
decreasing trend from 55,000 to 48,200 years BP. Sedimentation rates were higher between
17,000 and 9,000 years BP than during MIS 3 around 4,6 cm/kyrs and 2,5 cm/kyrs
respectively. Runoff increased between 35,000 and 15,000 years ago although our data
indicate no clear variation in sea surface salinity during this period. Several forcing and
feedback mechanisms such as local insolation and dynamics of monsoonal rainfall and
Inter-Tropical Convergence Zone and their possible relation to high-latitude climate forcing
will be explored. |
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