Variations of paleoproductivity in the nuclear region of western Pacific warm pool since MIS 7:response to ENSO-like process

ZHAO Jing-tao; LI Tie-gang; CHANG Feng-ming; LI Jun

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ZHAO Jing-tao, LI Tie-gang, CHANG Feng-ming, LI Jun. Variations of paleoproductivity in the nuclear region of western Pacific warm pool since MIS 7:response to ENSO-like process[J]. Haiyang Xuebao, 2008, 30(4): 87-94.

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Variations of paleoproductivity in the nuclear region of western Pacific warm pool since MIS 7:response to ENSO-like process

1.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology of Ministry of Land and Natural Resources, Qingdao Institute of Marine Geology, Ministry of Land and Natural Resources, Qingdao 266071, China;Qingdao Institute of Marine Geology, Ministry of Land and Natural Resources, Qingdao 266071, China
2.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
3.
Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology of Ministry of Land and Natural Resources, Qingdao Institute of Marine Geology, Ministry of Land and Natural Resources, Qingdao 266071, China;Qingdao Institute of Marine Geology, Ministry of Land and Natural Resources, Qingdao 266071, China

Received Date: 2007-10-15
Rev Recd Date: 2008-02-29

Abstract

Abstract

Deep-sea Core WP7 (3°56'S,156°E,and water depth 1 580 m) retrieved from the nuclear region of western Pacific warm pool (WPWP) was selected for benthic foraminifera and calcareous nannofossil study.On the basis of the AMS ¹⁴C data and comparison with SPECMAP δ18O the stratigraphy of Core WP7 was established.Withbenthic foraminifera and nannofossil indexes,the variations of paleoproductivity and upper water structure were reconstructed and their control factors and paleoceangraphic implications in this region during the last 250 ka BP were discussed.Results showed that the primary productivity was higher in glacial periods (MIS 6,4 and 2) and lower in interglacial periods (MIS 7,5,3 and 1),which indicated the controlling influence of the Northern Hemisphereice volume changes on the productivity of WPWP.The down core changes of Florisphaeraprof unda percentage content implied that the thermocline was shallower in glacial periods and deeper in interglacial periods,which might be the direct controlling factors of WPWP productivity changes.It is speculated that the glacial-interglacial fluctuation of the depth of thermocline was induced by the super-ENSO variation.
- western Pacific warm pool,
- benthic foraminifera,
- calcareous nannofossil,
- paleoceano graphy,
- ENSO-like process

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References(42)

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