Intense winter cooling of the surface water in the northern Okinawa Trough during the last glacial period

被引：18

作者：

Yamamoto, Masanobu ^{[1
]}

Kishizaki, Midori ^{[1
]}

Oba, Tadamichi ^{[1
]}

Kawahata, Hodaka ^{[2
]}

机构：

[1] Hokkaido Univ, Fac Environm Earth Sci, Sapporo, Hokkaido, Japan

[2] Univ Tokyo, Atmosphere & Ocean Res Inst, Kashiwa, Chiba, Japan

来源：

JOURNAL OF ASIAN EARTH SCIENCES | 2013年 / 69卷

基金：

日本学术振兴会;

关键词：

TEX86; MD98-2195; The East China Sea; Okinawa Trough; LGM; Winter monsoon; Temperature; The last glacial period; EAST CHINA SEA; TERRESTRIAL ORGANIC-MATTER; RYUKYU ARC REGION; KUROSHIO CURRENT; PALEOENVIRONMENTAL CHANGES; TETRAETHER LIPIDS; MEMBRANE-LIPIDS; LAKE SUIGETSU; TEMPERATURE; VARIABILITY;

D O I：

10.1016/j.jseaes.2012.06.011

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

We generated a 42,000-year record of TEX86 (TEX86L and TEX86H) from core MD98-2195 to better understand changes in the hydrology of the East China Sea (ECS) in the last glacial period. The TEX86-derived temperature showed an intense cooling in the last glacial period, whereas U-37(K)-derived spring sea surface temperature (SST) and foraminiferal Mg/Ca-derived summer SST showed a much smaller-scale cooling. The difference between the TEX86- and Mg/Ca-derived temperatures was around 14 degrees C from 19 to 16 ka and abruptly decreased to around 5 degrees C from 16 to 13 ka. This suggests a strong winter cooling of the surface water during the last glacial period. TEX86-,U-37(K')-, and Mg/Ca-derived temperatures were lowest at 18-17 ka, implying that the formation of cold water was maximized during that period. These results show that the cold water mass developed in the northern Okinawa Trough during the last glacial and the Kuroshio branch did not fully enter the northern margin of the Okinawa Trough. (c) 2012 Elsevier Ltd. All rights reserved.

引用

页码：86 / 92

页数：7

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