Accession Number:

ADA636798

Title:

Quantitative Chemical Mass Transfer in Coastal Sediments During Early Diagenesis: Effects of Biological Transport, Mineralogy, and Fabric

Descriptive Note:

Annual rept.

Corporate Author:

NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS SEAFLOOR SCIENCES BRANCH

Personal Author(s):

Report Date:

1999-09-30

Pagination or Media Count:

6.0

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.

Subject Categories:

  • Biological Oceanography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE