Flux data of NU2_trap (Table A1)

Oscar E Romero; Babette Boeckel; Barbara Donner; Gaute Lavik; Gerhard Fischer; Gerold Wefer

doi:10.1594/pangaea.115823

Flux data of NU2_trap (Table A1)

Citation

Romero O E, Boeckel B, Donner B, Lavik G, Fischer G, Wefer G (2002). Flux data of NU2_trap (Table A1). PANGAEA - Publishing Network for Geoscientific and Environmental Data. Occurrence dataset https://doi.org/10.1594/pangaea.115823 accessed via GBIF.org on 2023-05-30.

Description

Flux of bulk components, carbonate- and silicate-bearing skeleton organisms, and the d15N-isotopic signal were investigated on a 1-year time-series sediment trap deployed at the pelagic NU mooring site (Namibia Upwelling, ca. 29°S, 13°E) in the central Benguela System. The flux of bulk components mostly shows bimodal seasonality with major peaks in austral summer and winter, and moderate to low export in austral fall and spring. The calcium carbonate fraction dominates the export of particulates throughout the year, followed by lithogenic and biogenic opal. Planktonic foraminifera and coccolithophorids are major components of the carbonate fraction, while diatoms clearly dominate the biogenic opal fraction. Bulk d15N isotopic composition of particulate matter is positively correlated with the total mass flux during summer and fall, while negatively correlated during winter and spring. Seasonal changes in the intensity of the main oceanographic processes affecting the NU site are inferred from variations in bulk component flux, and in the flux and diversity patterns of individual species or group of species. Influence from the Namaqua (Hondeklip) upwelling cell through offshore migration of chlorophyll filaments is stronger in summer, while the winter flux maximum seems to reflect mainly in situ production, with less influence from the coastal and shelf upwelling areas. On a yearly basis, dominant microorganisms correspond well with the flora and fauna of tropical/subtropical waters, with minor contribution of near-shore organisms. The simultaneous occurrence of species with different ecological affinities mirrors the fact that the mooring site was located in a transitional region with large hydrographic variability over short-time intervals.

Taxonomic Coverages

Animalia
rank: kingdom
Protozoa
rank: kingdom
Chromista
rank: kingdom

Geographic Coverages

Event: NU2_trap, Namibia upwelling, Southeast Atlantic ;

Bibliographic Citations

Contacts

Oscar E Romero
originator

Babette Boeckel
originator

Barbara Donner
originator

Gaute Lavik
originator

Gerhard Fischer
originator

Gerold Wefer
originator

metadata author
PANGAEA - Data Publisher for Earth & Environmental Science
email: info@pangaea.de
homepage: https://www.pangaea.de

administrative point of contact
PANGAEA - Data Publisher for Earth & Environmental Science
email: info@pangaea.de
homepage: http://www.pangaea.de