Mindanao Dome variability over the last 160 kyr: Episodic glacial cooling of the West Pacific Warm Pool
| Type | Article | ||||||||
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| Date | 2011-02 | ||||||||
| Language | English | ||||||||
| Author(s) | Bolliet Timothe1, Holbourn Ann1, Kuhnt Wolfgang1, Laj Carlo2, Kissel Catherine2, Beaufort Luc3, Kienast Markus4, Andersen Nils5, Garbe-Schoenberg Dieter1 | ||||||||
| Affiliation(s) | 1 : Univ Kiel, Inst Geosci, D-24118 Kiel, Germany. 2 : UVSQ, CNRS, CEA, Lab Sci Climat & Environm,IPSL, F-91198 Gif Sur Yvette, France. 3 : Aix Marseille Univ, CNRS, CEREGE, IRD, F-13545 Aix En Provence, France. 4 : Dalhousie Univ, Dept Oceanog, Halifax, NS B3H 4J1, Canada. 5 : Univ Kiel, Leibniz Lab Radiometr Dating & Stable Isotope Res, D-24118 Kiel, Germany. |
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| Source | Paleoceanography (0883-8305) (Amer Geophysical Union), 2011-02 , Vol. 26 , N. PA1208 , P. 1-18 | ||||||||
| DOI | 10.1029/2010PA001966 | ||||||||
| WOS© Times Cited | 73 | ||||||||
| Keyword(s) | Mindanao Dome, East Asian monsoon, oceanic circulation | ||||||||
| Abstract | We present sea surface, upper thermocline, and benthic delta O-18 data, as well as temperature and paleoproductivity proxy data, from the International Marine Global Change Study Program (IMAGES) Core MD06-3067 (6 degrees 31' N, 126 degrees 30' E, 1575 m water depth), located in the western equatorial Pacific Ocean within the flow path of the Mindanao Current. Our records reveal considerable glacial-interglacial and suborbital variability in the Mindanao Dome upwelling over the last 160 kyr. Dome activity generally intensified during glacial intervals resulting in cooler thermocline waters, whereas it substantially declined during interglacials, in particular in the early Holocene and early marine oxygen isotope stage (MIS) 5e, when upwelling waters did not reach the thermocline. During MIS 3 and MIS 2, enhanced surface productivity together with remarkably low SST and low upper ocean thermal contrast provide evidence for episodic glacial upwelling to the surface, whereas transient surface warming marks periodic collapses of the Mindanao Dome upwelling during Heinrich events. We attribute the high variability during MIS 3 and MIS 2 to changes in the El Nino-Southern Oscillation state that affected boreal winter monsoonal winds and upper ocean circulation. Glacial upwelling intensified when a strong cyclonic gyre became established, whereas El Nino-like conditions during Heinrich events tended to suppress the cyclonic circulation, reducing Ekman transport. Thus, our findings demonstrate that variations in the Mindanao Dome upwelling are closely linked to the position and intensity of the tropical convection and also reflect far-field influences from the high latitudes. | ||||||||
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