Fluxes and foraminifera fluxes of sediment traps in the Peru-Chile Current ...

• Main Authors: Hebbeln, Dierk, Marchant, Margarita, Wefer, Gerold
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2000
• Subjects: Trap; Joint Global Ocean Flux Study JGOFS; Neogloboquadrina pachyderma
• Online Access: https://dx.doi.org/10.1594/pangaea.759825; https://doi.pangaea.de/10.1594/PANGAEA.759825

Time-series sediment traps were deployed 180 km off the Chilean coast at 30°S in the Peru-Chile Current during the El Niño period 1991/1992 (6 months) and during the 'normal' period 1993/1994 (12 months). Under normal conditions in 1993/1994 the particle fluxes display a pronounced seasonal cycle marked by a settling phytoplankton bloom in September, intermediate fluxes until January, and low fluxes between January and July. This seasonal pattern is also reflected in stable isotope data, measured on the planktic foraminifera species Neogloboquadrina pachyderma (dex.) and Globigerina bulloides, which indicate persistent upwelling conditions between August and February followed by a stratified water column between March and July. The total flux under normal conditions amounts to 65.1 g m**-2 a**-1, with the main flux constituents contributing 47.6% (carbonate), 26.4% (lithogenic matter), 17.4% (biogenic opal), and 8.6% (organic matter), respectively. Based on these particle flux data the export production has ... : Supplement to: Hebbeln, Dierk; Marchant, Margarita; Wefer, Gerold (2000): Seasonal variations of the particle flux in the Peru-Chile Current at 30°S under normal and El Nino conditions. Deep Sea Research Part II: Topical Studies in Oceanography, 47(9-11), 2101-2128 ...