Abrupt shoaling of the nutricline in response to massive freshwater flooding at the onset of the last interglacial sapropel event

被引:48
|
作者
Grelaud, Michael [1 ]
Marino, Gianluca [1 ]
Ziveri, Patrizia [1 ,2 ]
Rohling, Eelco J. [3 ]
机构
[1] Univ Autonoma Barcelona, Inst Ciencia & Tecnol Ambientals, ES-08193 Bellaterra, Spain
[2] Vrije Univ Amsterdam, Dept Earth Sci, FALW, Amsterdam, Netherlands
[3] Univ Southampton, Sch Ocean & Earth Sci, Natl Oceanog Ctr, Southampton, Hants, England
来源
PALEOCEANOGRAPHY | 2012年 / 27卷
基金
英国自然环境研究理事会;
关键词
EASTERN MEDITERRANEAN SAPROPEL; OCEANIC PRIMARY PRODUCTION; AEGEAN SEA; CALCAREOUS NANNOFOSSILS; INTERMEDIATE WATER; MARINE-SEDIMENTS; DEEP-WATER; IONIAN SEA; CIRCULATION; PRODUCTIVITY;
D O I
10.1029/2012PA002288
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
A detailed assessment of the respective roles of production, export, and subsequent preservation of organic carbon (C-org) in the eastern Mediterranean (EMED) sediments during the formation of sapropels remains elusive. Here we present new micropaleontological results for both surface samples taken at several locations in the EMED and last interglacial sapropel S5 from core LC21 in the southeastern Aegean Sea. A strong exponential anticorrelation between relative abundances of the lower photic zone coccolithophore Florisphaera profunda in the surface sediments and modern concentrations of chlorophyll a (Chl-a) at the sea surface suggests that F. profunda percentages can be used to track past productivity changes in the EMED. Prior to S5 deposition, an abrupt and large increase of F. profunda percentages in LC21 coincided (within the multidecadal resolution of the records) with the marked freshening of EMED surface waters. This suggests a strong coupling between freshwater-bound surface to intermediate water (density) stratification and enhanced upward advection of nutrients to the base of the photic zone, fuelling a productive deep chlorophyll maximum (DCM) underneath a nutrient-starved surface layer. Our findings imply that (at least) at the onset of sapropel formation physical and biogeochemical processes likely operated in tandem, enabling high C-org accumulation at the seafloor.
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页数:9
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