Figure 5. Within and between day variability in UVP predicted
particle flux at ETNP Station P2. All profiles are depth binned with
higher resolution towards the surface (methods). Horizontal blue lines
indicate the top and bottom of the ODZ, while the horizontal green line
indicates the base of the photic zone. A. Flux profiles in the
top 1000 m of the water column. B. A more detailed depiction of
the area enclosed by the rectangle in A . – C. The
rate of change of flux, divided by the rate in change in depth. The
fifth root of these values are shown to highlight differences between
values close to zero. Hour corresponds to local, Mexican General
Standard, time.
Smoothed and averaged
data
At the ETNP ODZ site, highly smoothed particle abundance data suggested
that particle size, averaged across all casts, followed a pattern in
which the abundance of <500 μm particles increased between the
oxycline and 350 m (Figure 6A), which corresponded with steepening of
the particle size distribution slope (Figure 6B), and an increase in
microaggregate (<500 μm) particle biomass (Figure 6C), but not
of > 500 μm particle biomass (Figure 6D). Deeper in the
ODZ, the microaggregate (<500 μm) particle number and biomass,
and the particle size distribution slope declined.