Hydrocarbons, sterols and alkenones at time series station KERFIX

Hydrocarbons, sterols and alkenones were analyzed in samples collected from a 10 month sediment trap time series deployed in the Indian Ocean sector of the Southern Ocean. Fluxes and within-class distributions varied seasonally. During higher mass and organic carbon (OC) flux periods, which occurred...

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Bibliographic Details
Main Authors: Ternois, Yann, Sicre, Marie-Alexandrine, Boireau, Anne, Beaufort, Luc, Miquel, Juan Carlos, Jeandel, Catherine
Format: Other/Unknown Material
Language:English
Published: PANGAEA 1998
Subjects:
Biogeochemical Processes in the Oceans and Fluxes
JGOFS
Joint Global Ocean Flux Study
KERFIX
Kerguelen
MOOR
Mooring
PROOF
Time-series station
Antarctic
Southern Ocean
Austral
Indian
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.740059
https://doi.org/10.1594/PANGAEA.740059
Description
Summary:Hydrocarbons, sterols and alkenones were analyzed in samples collected from a 10 month sediment trap time series deployed in the Indian Ocean sector of the Southern Ocean. Fluxes and within-class distributions varied seasonally. During higher mass and organic carbon (OC) flux periods, which occurred in austral summer and fall, fresh marine inputs were predominant. Vertical fluxes were most intense in January, but limited to one week in duration. They were, however, low compared with other oceanic regions. In contrast, low mass and OC flux periods were characterized by a strong unresolved complex mixture (UCM) in the hydrocarbon fraction and a high proportion of stanols as a result of zooplanktonic grazing. Terrigenous inputs were not detectable. The alkenone compositions were consistent with previous data on suspended particles from Antarctic waters. However, UK'37 values diverged from the linear and exponential fits established by Sikes et al. (1997, doi:10.1016/S0016-7037(97)00017-3) in the low temperature range. The seasonal pattern of alkenone production implied that IPT (integrated production temperature) is likely to be strongly imprinted by austral summer and fall SST (sea surface temperature).

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