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

• 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

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 ...