Oxygenation changes in the deep western Arabian Sea during the last 190,000 years: Productivity versus deepwater circulation

作者: Gerhard Schmiedl , Dirk C. Leuschner

DOI: 10.1029/2004PA001044

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摘要: [1] Fluctuations in the abundance of selected foraminiferal indicator species and diversity allowed reconstruction changes deepwater oxygenation monsoon-driven organic matter fluxes deep western Arabian Sea during last 190 kyr. Times maximum surface production coincide with periods intensified SW monsoon as shown by Globigerina bulloides enhanced carbonate corrosion. Benthic ecosystem variability is not exclusively driven variations monsoonal upwelling related supply to seafloor but also ventilation. Deepening base oxygen minimum zone (OMZ) below 1800 m water depth strongly coherent on precessional band lags proxies strength 4 6 The “out-of-phase” relationship between OMZ deepening explained temporal advection oxygen-rich masses North Atlantic Antarctic origin. This process affected remineralization burial efficiency Sea, resulting observed phase lag carbon preservation.

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