(Table S1) 230Th normalized diatom fluxes through HE1 in sediment core MD95-2027 ...

• Main Authors: Nave, Silvia Osorio, Labeyrie, Laurent D, Gherardi, Jeanne-Marie, Caillon, Nicolas, Cortijo, Elsa, Kissel, Catherine, Abrantes, Fatima F
• Format: Dataset
• Language: English
• Published: PANGAEA 2007
• Subjects: DEPTH, sediment/rock; AGE; Thorium-230, flux normalized; Diatoms, total, per unit sediment mass; -; Accumulation rate, diatoms; Calypso Corer; MD101; Marion Dufresne 1995; Norwegian Sea; Silvia; Ice Sheet; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.833081; https://doi.pangaea.de/10.1594/PANGAEA.833081

he last glacial was punctuated by several massive ice sheet surges into the North Atlantic that impacted surface water hydrology especially where icebergs melted. However, the links between variations in surface water hydrology and surface water productivity during these Heinrich events (HEs) remain uncertain. To address this issue, diatoms and organic carbon were examined across Heinrich event 1 (HE 1) and Heinrich event 4 (HE 4) in seven sediment cores spanning 40°N to 63°N latitude. Our results show low diatom abundances during HEs, consistent with decreased surface water productivity. Diatom dilution by increased sediment flux was tested by normalizing diatom abundance to a constant 230Th flux. Although the particle rain rate was enhanced during HEs, this does not explain the sharp drop in diatoms. During HE 4, surface productivity decreased at all latitudes examined, probably because of strong, year-round stratification. The same inferred changes occurred during HE 1 within the area of maximum iceberg ... : Supplement to: Nave, Silvia Osorio; Labeyrie, Laurent D; Gherardi, Jeanne-Marie; Caillon, Nicolas; Cortijo, Elsa; Kissel, Catherine; Abrantes, Fatima F (2007): Primary productivity response to Heinrich events in the North Atlantic Ocean and Norwegian Sea. Paleoceanography, 22(3), PA3216 ...