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Phosphorous displays a common pattern to all segments in Biscayne Bay, except MBS,
consisting of (Fig 3.20):
 Below average TP values until the end of 1998, followed by above average TP to
early-mid 2001
 Seasonal changes with below average values until early 2002 followed by above
average TP to late 2002
52
Figure 3.19: TN Zcusum charts for water quality segments in Biscayne Bay
 Below average TP until early 2005 followed by a long above average period,
which started with a sudden increase in concentration in the summer 2005
(Wilma impact), followed by a less steep decline until mid-to-late 2006 when
again a sudden increase in TP occurred.
 Finally, TP declines from early 2007 to the end of the POC.
The extreme impact of hurricanes Katrina, Rita and especially Wilma in 2005, distorted
the TP pattern at MBS (Fig 3.20) which otherwise would follow a similar pattern as the
rest of the Bay. In this context, TP across all Biscayne Bay was declining until 2005. As
for TN, seasonality is not well defined for TP either.
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TN Zcusum
MBS TN
-10
-5
0
5
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15
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Jan-98
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Jan-00
Jan-01
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Jan-03
Jan-04
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Jan-08
Jan-09
TN Zcusum
CS TN
-5
0
5
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20
Jan-96
Jan-97
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Jan-00
Jan-01
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Jan-09
TN Zcusum
SCI TN
-5
0
5
10
15
20
Jan-96
Jan-97
Jan-98
Jan-99
Jan-00
Jan-01
Jan-02
Jan-03