Abstract
This chapter presents a discussion on dissolved organic matter (DOM) in marine sediment pore waters. The chapter examines DOM in sediment pore waters with reference to several specific questions regarding (1) the composition and reactivity of pore-water DOM, (2) the controls on pore-water DOM concentrations, (3) the role of benthic DOM fluxes in the global ocean cycles of carbon and nitrogen, and (4) the role of pore-water DOM in sediment carbon preservation. The discussion in this chapter focuses on examining these questions in estuarine and continental margin sediments, in part because much of the detailed work in recent years on sediment DOM cycling has occurred in these sediments. Because the vast majority of carbon preservation and remineralization in all marine sediments occur in estuarine and continental margin sediments, there is also an important scientific justification for taking this approach. The chapter concludes with a discussion on Bioturbated and/or Bioirrigated Sediments model (BBS model).
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