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1 |
1.2 |
1.4 TURB |
1 2 3 4 5 6 7 8 9 10 11 12 |
0 |
.5 |
1 |
1.5 |
2 |
2.5 |
3 |
3.5 TURB |
1 2 3 4 5 6 7 8 9 10 11 12 |
0 |
.5 |
1 |
1.5 |
2 |
2.5 |
3 |
3.5 |
4 TURB |
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0 |
.2 |
.4 |
.6 |
.8 |
1 |
1.2 |
1.4 |
1.6 TURB |
1 2 3 4 5 6 7 8 9 10 11 12 |
0 |
.25 |
.5 |
.75 |
1 |
1.25 |
1.5 |
1.75 |
2 |
2.25 |
2.5 TURB |
1 2 3 4 5 6 7 8 9 10 11 12 |
0 |
.5 |
1 |
1.5 |
2 |
2.5 |
3 |
3.5 TURB |
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0 |
.5 |
1 |
1.5 |
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2.5 |
3 |
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CS MBS NCI |
NCO NNB SCI |
SCM SCO SNB |
41 |
significant (Mann-Whitney p<0.0001). Finally, the lowest values (0.001 mg/l) |
characterize SCO, supporting the idea of nitrite coming from land sources, especially |
from areas without public sewer systems. |
Figure 3.10: Seasonal variability of Nitrite (NO2) in Biscayne Bay waters |
Despite the uncertainty derived from the generally low concentrations, a clear |
seasonal pattern characterizes NO2 in most WQ clusters (Fig 3.10). NCI, NCO and SCI |
have a common pattern where higher values and spread occur from June to December, |
especially SCI, and there is a sharp contrast between May small variance and the large |
spread of values in June, when the rainy season begins. Nitrite seasonalities are |
strikingly similar to those of freshwater flows (Fig 3.6). SCM and SCO show the same |
seasonal patterns but more subdued. MBS displays higher concentrations from |
September to January and CS from October to December.. |
Nitrate (NO3) |
Lower average nitrate concentrations (<0.020 mg/l) occur in CS, MBS, NCI, |
NCO, and SCO, while higher values (0.028 to 0.094 mg/l) occur in SCI and SCM. This |
pattern suggests a sharp west-east gradient for NO3 in South Central Biscayne Bay |
linked to inland sources of nitrate, especially in SCI, and mixing gradients with oceanic |
waters of the reef-track. This pattern underscores the importance of agricultural areas |
as main source on inorganic nitrogen to Biscayne Bay. Two fundamental seasonal |
0 |
.001 |
.002 |
.003 |
.004 |
.005 |
.006 |
.007 |
.008 |
.009 |
.01 NO2 |
1 2 3 4 5 6 7 8 9 10 11 12 |
0 |
.001 |
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