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patrickbdevaney
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mia9

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the late dry season and higher concentrations and variability during the wet season
peaking in September or October (Fig 3.12). Also, there is a noticeable increase in
June, which is the first rainy month after the dry season.
0
.01
.02
.03
.04
.05
.06
.07
.08 NO3
1 2 3 4 5 6 7 8 9 10 11 12
0
.02
.04
.06
.08
.1
.12
.14 NO3
1 2 3 4 5 6 7 8 9 10 11 12
0
.01
.02
.03
.04
.05
.06 NO3
1 2 3 4 5 6 7 8 9 10 11 12
0
.02
.04
.06
.08
.1
.12 NO3
1 2 3 4 5 6 7 8 9 10 11 12
0
.1
.2
.3
.4
.5
.6 NO3
1 2 3 4 5 6 7 8 9 10 11 12
0
.05
.1
.15
.2
.25
.3
.35 NO3
1 2 3 4 5 6 7 8 9 10 11 12
0
.005
.01
.015
.02
.025
.03
.035 NO3
1 2 3 4 5 6 7 8 9 10 11 12
0
.01
.02
.03
.04
.05
.06
.07 NO3
1 2 3 4 5 6 7 8 9 10 11 12
0
.02
.04
.06
.08
.1
.12 NO3
1 2 3 4 5 6 7 8 9 10 11 12
CS MBS NCI
NCO NNB SCI
SCM SCO SNB
43
Figure 3.12: Seasonal variability of Ammonium (NH4) in Biscayne Bay
Total Nitrogen (TN) and Total Organic Nitrogen (TON)
Most of the TN (about 75%) is in organic form (TON). The TN spatial distribution
varies across the bay, with the southern portion having higher values and the northern
one lower values. The highest mean TN concentrations are observed at MBS (0.468
mg/l) and SCI (0.433 mg/l) and the lowest at SCO (0.216 mg/l). Although TN displays
slightly higher values in the wet season, a clear seasonality (Fig 3.13) is not well
defined. However, a persistent high occurs in August. The exceptions are CS and
MBS, both of which display a seasonal pattern with higher values in the wet season.
TON, on the other hand, has no defined seasonal pattern (Fig 3.14).The high TN values
observed at MBS are difficult to explain considering that TN loads from the C-111 canal
into Manatee Bay are less than 50 Ton/yr, nearly 1/10th from that of canals discharging
into SCI. Hence, the significantly higher median TN and TON concentrations in MBS
and SCI may be due to contributions from wetlands, either as overland flow or from
groundwater.