海洋地质与第四纪地质2017，Vol.37Issue(3)：129-137,9.DOI:10.16562/j.cnki.0256-1492.2017.03.013
末次冰期以来印尼穿越流出口处古海洋学记录及其意义
PALEOCEANOGRAPHIC RECORDS OF INDONESIAN THROUGHFLOW AT ITS EXIT SINCE THE LAST GLACIAL AND THEIR SIGNIFICANCE
摘要
Abstract
The Indonesian Throughflow (ITF),sole conduit between the Pacific and Indian Oceans,plays an important role in regulating heat and fresh water budgets between the two oceans,and in controlling the tropical and global climate.In this study,we investigated records from the Core SO18460 that was drilled at the exit of the ITF into the Timor Sea to reexamine their significance in reflecting the ITF since the last glacial.Records of temperature and salinity of surface and subsurface seawaters,and depth of thermocline (DOT) were reconstructed from δ18O and Mg/Ca ratio of the planktonic foraminifera of Globigerinoides ruber and Pulleniatina obliquiloculata and were then compared with regional paleoclimatic indices.The results show that salinity of both surface and thermocline seawaters co-varied with regional precipitation over the last glacial cycle,likely indicating transmission of precipitation signal by means of seawater salinity from sea surface to thermocline through upper ocean mixing.Sea surface temperature at the coring site of Core SO18460 oscillated centering at 28 ℃,possibly under influence of the Western Pacific Warm Pool since the early Holocene.In contrast,thermcoline seawater temperature (TWT) was always below 22 ℃,probably indicating that El Ni(n)o-Southern Oscillation was located in El Ni(n)o-like episodes.Decline of TWT and shoal of DOT might be,on the one hand,in response to more frequent El Ni(n)o-like events;and on the other hand,resulted from depression of ITF surface flow caused by increased precipitation due to southward shift of the Intertropical Convergence Zone,and/or by intensification of South China Sea surface flow driven by enhanced East Asian winter monsoon during Holocene.On glacial-interglacial timescale,TWT co-varied with the boreal summer insolation,possibly due to influence of North Pacific Tropical Water sourced waters that were carried by the Mindanao Current to the Sulawesi Sea and merged into the ITF.关键词
盐度/西太平洋暖池/厄尔尼诺-南方涛动/北太平洋热带水/印尼穿越流Key words
Indonesian Throughflow/salinity/Western Pacific Warm Pool/El Ni(n)o-Southern Oscillation/North Pacific Tropical Water分类
海洋科学引用本文复制引用
张鹏,徐建,杨策,葛莲凤,张振国,牛耀..末次冰期以来印尼穿越流出口处古海洋学记录及其意义[J].海洋地质与第四纪地质,2017,37(3):129-137,9.基金项目
国家自然科学基金面上项目“末次冰期以来印尼穿越流次表层流时空变迁及其古海洋学意义”(41576045) （41576045）
2015年度陕西省人力资源与保障厅留学人员科技活动项目择优资助优秀类(陕人社函[2015]1190号) （陕人社函[2015]1190号）
