摘要
The sediment core DGKS9603 collected from the Okinawa Trough was used as research tar-get.By use of unsaturated index U37k of long-chain alkenone, δ13C of POC of planktonic foraminifera(G.Sacculifer),the evolutions of sea surface temperature and partial pressure of carbon dioxide inthe atmosphere during the Holocene were reconstructed in the Okinawa Trough. And in combination ofδ18O 0f planktonic foraminifera,the relative difference of sea surface salinity during the Holocene wasalso reconstructed.Consequently,three cooling events(E1~E3) were identified,each of which oc-curred at 1.7~1.6, 5.1|~4.8 and 8.1~7.4kaBP(cal),respectively.Of the three events,E2 andE3 are globally comparable,their occurrence mechanism would be that the main stream of the KuroshioCurrent shifted eastward due to the enhanced circulation of the northeastern Pacific Ocean,which wasdriven in turn by amplified intensity of sunshine and subsequent enhancement of subtropical high pres-sure;E1 corresponds to the Small Ice-Age Event occurred between 1550 and 1850AD in China.In theOkinawa Trough,E1 might be also related to the eastward shift of main stream of the Kuroshio currentdriven by powerful Asia winter monsoon.