georefid:2009-041622SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2009-0416222006-01-01publicationgeorefid:2009-041622Zheng FanChinese Academy of Sciences, South China Sea Institute of Oceanography, Guangzhou, ChinaauthorLi QianyuTongji University, ChinaauthorChen, MuhongUniversity of Adelaide, AustraliaauthorChina University of Geoscience, Wuhan, ChinapublisherdocumentHardcopyEarth Science. Journal of China University of Geoscience31 (6)780-786Planktonic Foraminifera from ODP Site 1144 in the northern South China Sea indicate that the Middle Pleistocene climate transition is characterized by high-frequency changes on a millennial scale. On pace with glacial-interglacial cycles after the dominant glacial cyclicity shifted from 41 ka to 100 ka over the last 0.9 Ma, sudden increases in the abundance of cool-water planktonic foraminiferal species became more evident. SST variations estimated by the transfer function show large decreases of up to 10 degrees C during the four major glacial periods of MIS22, 20, 18 and 16 between 0.9-0.6 Ma. Cooler conditions in glacial times also caused the thermocline depth to shoal in steps to a minimum of about 65 m during MIS20. Therefore, during the Middle Pleistocene climate transition, the upper ocean water environment in the northern South China Sea was marked by delta (super 18) O values heavier than at the last glacial maximum, a shoaled thermocline, and a significant decrease to an almost complete absence of several deep-water planktonic foraminiferal species, amplifying the paleoclimatic signals of SST contrasts between the northern and southern South China Sea and a strengthened winter monsoon on a millennial scale. Together with the E-W equatorial Pacific record, the N-S contrasts in the South China Sea demonstrate the significance of low latitude processes in climate change.completedQuaternary geologyCenozoicForaminiferaglacial environmentinterglacial environmentInvertebrataLeg 184microfossilsmiddle PleistoceneNorth PacificNorthwest PacificOcean Drilling ProgramODP Site 1144Pacific Oceanpaleo-oceanographypaleoclimatologypaleoecologyplanktonic taxaPleistoceneProtistaQuaternarysea-surface temperatureSouth China SeaWest Pacificurn:org.iodp:exp:184urnlargerWorkCitationcampaignurn:org.iodp:exp:184:site:1144urnlargerWorkCitationstudyurn:org.iodp:exp:184urnlargerWorkCitationcampaignChinesegeoscientificInformation117.2508117.250820.031120.0311