Premium
Recycling of organic matter in Antarctic sediments: A transect through the polar front in the Southern Ocean (Indian Sector)
Author(s) -
Rabouille Christophe,
Gaillard JeanFrancois,
Relexans JeanClaude,
Tréguer Paul,
Vincendeau MarieAnne
Publication year - 1998
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1998.43.3.0420
Subject(s) - polar front , total organic carbon , transect , organic matter , oceanography , sediment , deposition (geology) , front (military) , pelagic sediment , pelagic zone , sediment–water interface , flux (metallurgy) , dissolved organic carbon , geology , carbon fibers , environmental science , environmental chemistry , chemistry , paleontology , materials science , organic chemistry , composite number , composite material
Sediments from the Polar Front Zone were sampled in the Indian Sector of the Antarctic Ocean as part of the French JGOFS expedition Antares 1. The first porewater distributions of O 2 and NO 3 = and organic carbon data in the solid phase in this part of the ocean were used to model the recycling of organic matter in sediments. The data are described by a model containing two types of degradable organic matter with distinct reactivities. We estimate that the reactivity of the most labile organic carbon is very close to that of fresh organic matter with an average C : N ratio of 7. We estimate that particulate organic carbon fluxes deposited at the sediment‐water interface range between 0.2 and 0.8 mol C m −l y −l , with two peaks near the Polar Front and the Subantarctic Front. The flux 01 organic carbon deposited at the sediment‐water interface is unusually high and represents ˜10–20% of estimated primary production. From these findings, we conclude that production in the pelagic zone of this region is strongly linked to deposition and recycling in the sediment.