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53
Figure 3.20: TP Zcusum charts for water quality segments in Biscayne Bay
Total Organic Carbon
Total Organic Carbon has declined continuously in Biscayne Bay in the POC as
indicated by the dome-shaped Zcusum charts of Fig 3.21. Only MBS and CS and
perhaps SCM show evidence of hurricane impacts in 2005-2006, highlighted by sudden
increases in TOC concentration, lasting until the end of 2006. Except for SCO, where
oceanic exchange is the largest, seasonality is well displayed across the Bay, as shown
by the wavy pattern of cusum charts (Fig 3.21). The constant decline of TOC, since
early 1990s, has been reported for all South Florida coastal and estuarine waters
(Briceño and Boyer 2007, 2008 and 2010), and has been linked to a major system shift
in North Atlantic SST which cascaded into regional wetter-warmer climatic conditions.
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