GLACIAL TO INTERGLACIAL SURFACE NUTRIENT VARIATIONS OF BERING DEEP BASINS RECORDED BY DELTA-C-13 AND DELTA-N-15 OF SEDIMENTARY ORGANIC-MATTER

被引：57

作者：

NAKATSUKA, T ^{[1
]}

WATANABE, K ^{[1
]}

HANDA, N ^{[1
]}

MATSUMOTO, E ^{[1
]}

WADA, E ^{[1
]}

机构：

[1] KYOTO UNIV,CTR ECOL RES,OTSU,SHIGA 52001,JAPAN

来源：

PALEOCEANOGRAPHY | 1995年 / 10卷 / 06期

关键词：

D O I：

10.1029/95PA02644

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Stable carbon and nitrogen isotopic ratios (delta(13)C and delta(15)N) Of organic matter were measured in three sediment cores from deep basins of the Bering Sea to investigate past changes in surface nutrient conditions. For surface water reconstructions, hemipelagic layers in the cores were distinguished from turbidite layers (on the basis of their sedimentary structures and C-14 ages) and analyzed for isotopic studies. Although delta(13)C profiles may have been affected by diagenesis, both delta(15)N and delta(13)C values showed common positive anomalies during the last deglaciation. We explain these anomalies as reflecting suppressed vertical mixing and low nutrient concentrations in surface waters caused by injection of meltwater from alpine glaciers around the Bering Sea.

引用

页码：1047 / 1061

页数：15

共 77 条

[1] CLIMATE-RELATED VARIATIONS IN DENITRIFICATION IN THE ARABIAN SEA FROM SEDIMENT N-15/N-14 RATIOS [J].