Paleoproductivity variations in the southern Okinawa Trough since the middle Holocene: Calcareous nannofossil records

被引：4

作者：

Zhao JingTao ^{[1
,2
,3
]}

Li TieGang ^{[1
]}

Li Jun ^{[2
]}

Hu BangQi ^{[2
,3
]}

机构：

[1] Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China

[2] Qingdao Inst Marine Geol, Key Lab Marine Hydrocarbon Resource & Geol, Minist Land & Resources, Qingdao 266071, Peoples R China

[3] Chinese Acad Sci, Key Lab Marginal Sea Geol, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China

来源：

CHINESE SCIENCE BULLETIN | 2012年 / 57卷 / 30期

基金：

中国国家自然科学基金;

关键词：

middle Holocene; the southern Okinawa Trough; primary productivity; calcareous nannofossil; EAST CHINA SEA; OCEANIC PRIMARY PRODUCTION; ASIAN MONSOON; EL-NINO; HIGH-RESOLUTION; PALEOCEANOGRAPHIC INDICATORS; PALEOENVIRONMENTAL CHANGES; FORAMINIFERAL RECORD; CARBON ISOTOPES; SUMMER MONSOONS;

D O I：

10.1007/s11434-012-5276-y

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Based on 17 AMS(14)C age data, we reconstructed high-resolution records of sea surface primary productivity (PP) in the southern Okinawa Trough (MD05-2908) over the last 6.8 ka BP using the calcareous nannofossil carbon isotope and the relative percentage contents of Florisphaera profunda indexes. The underlying mechanism controlling the sea surface PP was then discussed. The sea surface PP, indicated by the coccolith delta C-13 and %Fp conversional equations, decreased with some fluctuations since 6.8 ka BP. This decrease may be connected to the decreased terrigenous input resulting from the reduced East Asian Summer Monsoon (EASM) precipitation. Both the periods of 4-2 ka BP (PME) and 6.8-4.8 ka BP were characterized by relatively higher PP. The former was mainly controlled by the weakening of the Kuroshio Current, whereas the latter mainly resulted from the greater terrigenous input associated with the stronger EASM.

引用

页码：3917 / 3922

页数：6

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