摘要
冲绳海槽Z_(14-6)孔柱状样于1981年取得,该孔浮游有孔虫系统鉴定、统计及转换函数分析表明,该区12万年来曾存在三个温暖时期,末次间冰期存在两次寒冷波动。氧同位素5e亚期为最温暖时期,海水冬季表层水温高出现代1.9℃;氧同位素第2期为本区晚更新世以来最寒冷时期,冬季海水表层水温降至12.4℃,比现今低6.8℃。海水冬、夏表层水温差异与气候的寒冷程度有关,气候越寒冷,温差越大。此外,本文还就黑潮的某些古海洋学特性进行了初步探讨。
The Okinawa Trough, a narrow sediment basin, is situated in the middle part of the northern West Pacific Ocean. Sample site Z14-6 is located in the middle of the Okinawa Trough (27°07'N, 127°27'E, water depth 739m). Faunal trends and statistical and FP-12E transfer function analysis indicate that there were three warm periods during the last 120 000 years, and two cold periods in the last interglacial. Oxygen isotope substage 5e was the warmest periods, during which the winter sea surface temperature (SSTw) was 1.9℃ higher than that of today; Oxygen isotope stage 2 was the coldest period, during which the SSTw reached 12.4℃ and summer sea surface temperature (SSTs) was below 25.9℃, which were 6.8℃, 2.3℃ lower than that of present respectively. The difference, between SSTw and SSTs is related to the degree of frigidness. The Paleo-Kuroshio Current speed was controlled by global climate. The current velocity increased and the current area extended during the warm periods, and conversely in the cold periods. The current quantity fluctuation of Paleo-Kuroshio caused the changes of sea surface temperature.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1991年第3期264-271,共8页
Oceanologia Et Limnologia Sinica
