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waters determines the final concentration of nutrients within each bay segment |
(Appendix 1). |
37 |
Figure 3.6: Estimated net freshwater contribution in Mm3/month to Biscayne Bay segments |
(Net= Canal + precipitation + groundwater + overland - evaporation). North Biscayne Bay was |
not included in the box-model effort. |
Salinity |
Salinity increases eastwards from shoreline (SCI) to offshore (SCO). The |
highest mean and median salinities occur in SCO (35.8 and 36.1 PSU), where most |
exchange with oceanic waters takes place, while maintaining its seasonality with little |
change along the year (Fig 3.7). Nevertheless, maximum salinity events do not occur in |
SCO but closer to shore, in SCI (44.1 PSU) perhaps responding to high evaporation of |
shallower water masses. Salinity has reached hypersalinity levels (>40 PSU) in all |
clusters during the POR, while median and mean values are similar at each cluster (Fig |
3.7). The lowest minima occur also in MBS and SCI (3 and 6 and PSU respectively), |
where the standard deviations are the highest (6 PSU), coinciding with previous |
observations that sample sites along the shoreline exhibit the highest and the lowest |
salinity values and the greatest variation (Serafy et al. 1997; Bellmund et al. 2009). BNP |
data shows the occurrence of low salinity events in surface waters away from shore at |
the middle of the Bay in November 2004, April 2005, November 2006 and January |
2007. These fresher water bodies surrounded by saltier masses have been reported as |
caused by groundwater springs (Bellmund et al. 2009) seeping through the bay floor. |
Events of salinity inversion appear in FIU dataset but differences are always less than 1 |
PSU, except in a couple of events |
-20 |
0 |
20 |
40 |
60 |
80 |
100 NCI |
1 2 3 4 5 6 7 8 9 10 11 12 |
-6 |
-4 |
-2 |
0 |
2 |
4 |
6 |
8 |
10 NCO |
1 2 3 4 5 6 7 8 9 10 11 12 |
-20 |
0 |
20 |
40 |
60 |
80 |
100 |
120 |
140 |
160 SCI |
1 2 3 4 5 6 7 8 9 10 11 12 |
-15 |
-10 |
-5 |
0 |
5 |
10 |
15 |
20 |
25 SCM |
1 2 3 4 5 6 7 8 9 10 11 12 |
-40 |
-30 |
-20 |
-10 |
0 |
10 |
20 |
30 |
40 |
50 |
60 |
70 SCO |
1 2 3 4 5 6 7 8 9 10 11 12 |
-15 |
-10 |
-5 |
0 |
5 |
10 |
15 |
20 |
25 |
30 |
35 CS |
1 2 3 4 5 6 7 8 9 10 11 12 |
-20 |
-10 |
0 |
10 |
20 |
30 |
40 |
50 |
60 MBS |
1 2 3 4 5 6 7 8 9 10 11 12 |
CS MBS NCI |
NCO SCI |
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