represents an artificial flux. The trap intercepts the cycling of particles from the bottom into the water column and back to the bottom. This process increases the residence time of settling particles in the water column (Walsh et al., 1988b), but not the particulate flux to the bottom.
These difficulties cannot be overcome by mooring a single trap within the water column. Studies that involve deployment of 3-4 traps within the bottom 1000 m, however, indicate that local resuspension is not significant at elevations a few hundred meters above bottom (Dymond et al., 1981; Fischer, 1984; Walsh et al., 1988b). In this paper we will use particulate flux measurements from traps above the resuspension zone (Figure 9.2) to extrapolate the rain rate to bottom depths.
Temporal variations in the particle flux provide another complication to estimating the particulate rain to the bot-