Concentration and fluxes of dust and export production proxies on cores MD11-3353 and MD11-3357 ...

We present 230Th-normalized dust and export production fluxes for two contrasted marine sediment cores spanning the Antarctic Polar Front, close to the Kerguelen Plateau in the Southern Indian Ocean, covering the last glacial cycle.We report glacial lithogenic fluxes comparable to the South Atlantic...

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Bibliographic Details
Main Authors: Thöle, Lena M, Amsler, Helen Eri, Moretti, Simone, Auderset, Alexandra, Gilgannon, James, Lippold, Jörg, Vogel, Hendrik, Crosta, Xavier, Mazaud, Alain, Michel, Elisabeth, Martínez-García, Alfredo, Jaccard, Samuel L
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2019
Subjects:
Antarctic Zone
glacial-interglacial changes
iron fertilization
Southern Ocean
Subantarctic zone
Antarc*
Antarctic
Online Access:https://dx.doi.org/10.1594/pangaea.907130
https://doi.pangaea.de/10.1594/PANGAEA.907130
Description
Summary:We present 230Th-normalized dust and export production fluxes for two contrasted marine sediment cores spanning the Antarctic Polar Front, close to the Kerguelen Plateau in the Southern Indian Ocean, covering the last glacial cycle.We report glacial lithogenic fluxes comparable to the South Atlantic and higher than in the South Pacific sectors of the Southern Ocean. Structural and temporal discrepancies with dust reconstructions from Antarctic ice cores and the Atlantic and Pacific sectors of the Subantarctic Zone (SAZ) point towards Southern Africa and/or the Kerguelen Plateau as an additional source of lithogenic material to the Southern Indian Ocean during the last ice age.In the SAZ, export production proxies respond to iron (Fe) fertilization with total organic carbon (TOC) fluxes as high as those previously reported from the Atlantic sector of the Southern Ocean. However, the correlation between export production and dust proxies is weaker than in the other sectors, and shows a muted response of export ... : Supplement to: Thöle, Lena M; Amsler, Helen Eri; Moretti, Simone; Auderset, Alexandra; Gilgannon, James; Lippold, Jörg; Vogel, Hendrik; Crosta, Xavier; Mazaud, Alain; Michel, Elisabeth; Martínez-García, Alfredo; Jaccard, Samuel L (2019): Glacial-interglacial dust and export production records from the Southern Indian Ocean. Earth and Planetary Science Letters, 525, 115716 ...

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