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Reconstructing sea surface temperature, sea surface salinity and partial pressure of carbon dioxide in atmosphere in the Okinawa Trough during the Holocene and their paleoclimatic implications

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Chinese Science Bulletin 2003年第B6期48卷 88-92页

作者： MENGXianwei LIUYanguang lluzhenxia DUDewen HUANGQiyu Y.Saito KeyLaboratoryofMarineSedimentologyandEnvironmentalGeology FirstInstituteofOceanographyStateOceanicAdministrationQingdao266061China OceanUniversityofChina Qingdao266071China UniversityofTaiwan TaibeiChina GeologicalSurveyofJapan Tsukuba305-8567Japan

The sediment core DGKS9603 collected from the Okinawa Trough was used as research target. By use of unsaturated index U37^k of long-chain alkenone, δ^13C of POC and of planktonic foraminifera (G sacculifer), the evolutions of sea surface temperature and partial pressure of carbon dioxide in the atmosphere during the Holocene were reconstructed in the Okinawa Trough. And in combination of δ^18O of planktonic foraminifera, the relative difference of sea surface salinity during the Holocene was also ***, three cooling events (E1-E3) were identified,each of which occurred at 1.7-1.6, 5.1-4.8 and 8.1-7.4kaBP (cal), respectively. Of the three events, E2 and E3 are globally comparable, their occurrence mechanism would be that the main stream of the Kuroshio Current shifted eastward due to the enhanced circulation of the northeastern Pacific Ocean, which was driven in turn by amplified intensity of sunshine and subsequent enhancement of subtropical high pressure; E1 corresponds to the Small Ice-Age Event occurring between 1550 and 1850AD in China. In the Okinawa Trough, E1 might be also related to the eastward shift of main stream of the Kuroshio current driven by powerful Asia winter monsoon.

关键词：冲绳岛海槽全新世二氧化碳温度盐度日本海流亚热带高气压太平洋气候变化

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