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Fluctuations of Mediterranean outflow water circulation in the Gulf of Cadiz during MIS 5 to 7: Evidence from benthic foraminiferal assemblage and stable isotope records

DRS at CSIR-National Institute of Oceanography

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Title Fluctuations of Mediterranean outflow water circulation in the Gulf of Cadiz during MIS 5 to 7: Evidence from benthic foraminiferal assemblage and stable isotope records
 
Creator Singh, A.D.
Rai, A.K.
Tiwari, M.
Naidu, P.D.
Verma, K.
Chaturvedi, M.
Niyogi, A.
Pandey, D.
 
Subject PALAEO-STUDIES
PALAEO-STUDIES
OCEANOGRAPHY AND LIMNOLOGY
 
Description We studied variations in benthic foraminiferal assemblages and δ13C for the last 225 kyr at IODP site U1387 which is currently bathed by upper core of the Mediterranean Outflow Water (MOW). The MOW paleocirculation and sea-floor environment (oxygen level, trophic condition, bottom current strength) have been inferred from faunal composition; species diversity, abundances of selected index species/groups, microhabitat preferences combined with δ13C record of the epifaunal Cibicidoides pachyderma. The faunal and isotope records indicate relatively better ventilation at sea-floor and low trophic condition during MIS 1, 5 and 7 possibly due to increased influence of upper MOW in the Gulf of Cadiz. Our multi-proxy record reflects significant and rapid changes during cold (stadial) and warm (interstadial) phases within the interglacials MIS 5 and 7 and at Termination II. The faunal and isotope records reveal strong MOW flow and better ventilated, oligotrophic bottom-water conditions during stadials MIS 5b, 5d, 7b and 7d. The study further demonstrates weakened MOW intensity associated with poor ventilation and increased trophic level at sea-floor during interstadials MIS 5a, 5e, 7a and 7c. MOW flow was relatively sluggish at Termination II, followed by its strengthening at the end of MIS 5e. The chronology of these events suggests that periods of weakened MOW correlate with sapropel layers of the Mediterranean Sea, implying strong coupling between glacial–interglacial climate and MOW circulation in the Gulf of Cadiz
 
Date 2015-10-27T09:49:58Z
2015-10-27T09:49:58Z
2015
 
Type Journal Article
 
Identifier Global and Planetary Change, vol.133; 2015; 125-140.
http://drs.nio.org/drs/handle/2264/4830
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2015] Elsevier
 
Publisher Elsevier