Quantitative Chemical Mass Transfer in Coastal Sediments During Early Diagenesis: Effects of Biological Transport, Mineralogy, and Fabric
Abstract
LONG-TERM GOAL. The long-term goal is to develop a better mechanistic and quantitative understanding of the effects of biologically-enhanced transport, sediment fabric, and particle surface chemistry on the biogeochemical dynamics of coastal marine sediments. OBJECTIVES. The objectives for FY99 were (1) to quantify the solute transport processes in cohesive coastal sediments as functions of depth-dependent burrow distribution, ratio of active to abandoned burrows, and burrow flushing frequencies; and (2) to acquire and refine submicron-scale tools to investigate the relationship between organic matter (OM) reactivity and fabric parameters. The short-term goals included (1) continued bimonthly sampling, analyses, and data syntheses of St. Louis Bay and Horn Island test sites; (2) designing, establishment, sampling, analyses, and data syntheses of benthic mesocosm tank experiments; (3) quantitative description of biologically-enhanced solute transport (i.e., bioirrigation) in the field and laboratory sediments that explicitly considers depth-dependent burrow distribution, ratio of active to abandoned burrows, and burrow flushing frequencies; and (4) 10- 50 nm scale carbon mapping using energy-filtering transmission electron microscopy (EFTEM) to investigate the spatial relationship between clay mineral particles and sedimentary OM.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1999
- Accession Number
- ADA636798
Entities
People
- Yoko Furukawa
Organizations
- United States Naval Research Laboratory