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Great Miami area to Biscayne Bay more TP is supplied to the bay by canals than from |
ocean waters. |
Chlorophyll a (CHLa) |
Chlorophyll-a concentrations are very low as compare to most estuaries, with maximum |
concentration below 10 ug/l and mean values ranging from 1.72 (NNB) to .256 ug/l |
(SCO). Chlorophyll-a values display a conspicuous spatial pattern with larger average |
values and larger standard deviations occurring in the extreme north (NNB and SNB) |
and the southern extreme (MBS), while lower values appear in the south central portion |
of Biscayne Bay (SCI, SCM and SCO) (Fig 3.16). This pattern is similar to that of TP, |
underscoring a potential driver (TP)--response (CHLa) relationship. Disparities between |
mean and median values and the large standard deviations are indicative of high CHLa |
episodic events (blooms). CHLa seasonality is also crudely defined in Biscayne Bay |
waters. Generally higher values appear in September-December and -minimum in |
March-May. High mean CHLa in MBS was caused by blooms occurring after hurricanes |
Katrina, Rita and Wilma in 2005 (Rudnick et al. 2006, 2007; Briceño and Boyer 2010), |
which were sustained by nutrient input from a nearby road construction project. |
The maximum individual measurement ever observed by FIU WQMN in Biscayne |
Bay was 8.6 ug/l CHLa in Manatee Bay on January 2006. Even after such events, the |
90th percentile reached only 0.8 ug/l CHLa, indicating that South and Central Biscayne |
Bay waters are far from being considered impaired waters under the Florida impaired |
water rule, which states that an estuary is impaired if the annual mean CHLA |
concentration is greater than 11 ug/l. |
47 |
Figure 3.16: Seasonal variability and descriptive statistics of Chlorophyll a (CHLa) in |
Biscayne Bay |
Total Organic Carbon (TOC) |
Average TOC concentration is largest in MBS (7.18 mg/l) and lowest in SCO |
(2.45 mg/l). TOC seasonal pattern shows higher concentrations and larger variability in |
August-September and lower values in January-April (Fig 3.17). Hence, TOC |
concentrations are somehow related to climatic conditions with higher concentrations |
occurring during the rainy season (June-November). |
Figure 3.17: Seasonal variability of Total Organic Carbon (TOC) in Biscayne Bay |
0 |
.5 |
1 |
1.5 |
2 |
2.5 |
3 |
3.5 |
4 CHLA |
1 2 3 4 5 6 7 8 9 10 11 12 |
0 |
.5 |
1 |
1.5 |
2 |
2.5 |
3 CHLA |
1 2 3 4 5 6 7 8 9 10 11 12 |
0 |
.5 |
1 |
1.5 |
2 |
2.5 |
3 |
3.5 CHLA |
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 CHLA |
1 2 3 4 5 6 7 8 9 10 11 12 |
0 |
1 |
2 |
3 |
4 |
5 |
6CHLA |
1 2 3 4 5 6 7 8 9 10 11 12 |
0 |
.2 |
.4 |
.6 |
.8 |
1 |
1.2 CHLA |
1 2 3 4 5 6 7 8 9 10 11 12 |
0 |
.2 |
.4 |
.6 |
.8 |
1 |
1.2 |
1.4 |
1.6 |
1.8 |
2 CHLA |
1 2 3 4 5 6 7 8 9 10 11 12 |
0 |
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