Rusch, A. C.. Max Planck Institute for Marine Microbiology, arusch@mpi-breme.de
Huettel, M. C.. Max Planck Institute for Marine Microbiology,
Jorgensen, B. B.. Max Planck Institute for Marine Microbiology,

 
FIELD STUDIES ON MATERIAL TRANSPORT INTO INTERTIDAL SANDY SEDIMENTS CAUSED BY INTERFACIAL WATER FLOWS
 
Solute and particle transport across the sediment-water interface was investigated in an intertidal sandflat at the German North Sea coast. At the study site, sediment reworking by currents and benthic organisms reached down to a depth of 1.0-1.5 cm, whereas oxidized sediment was observed down to 3.5-9.0 cm depth. Our tracer studies revealed that waves and bottom currents forced water into the bed and transported suspended particles into deeper sediment layers. The penetration depth of spherical microbeads as well as natural particles (diatoms) depended on particle size and sediment grain size. Depth profiles of bacteria, diatoms, and chlorophyll contents of natural sediment from the same location yielded a rough estimate of fluxes and turnover rates and, thus, confirmed the relevance of advective particle transport for POM mineralization in near-shore benthic habitats.
 
Day: Wednesday, Feb. 3
Time: Poster
Location: Sweeney Center
 
Code: SS03WE1652S