Freshening Influence: Data Analysis

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For more details, please see our publication at Geophysical Research Letter (Ji et al., 2007).

The data analysis was conducted in seven zones across the Nova Scotian Shelf and Gulf of Maine as shown in the following figure.

The general pattern of the westward progression of the SPB from NSS to the western GoM is presented in the following figure. Blooms occurred, on average, about 2 weeks later in Zone 7 than that in Zone 1, with a maximum delay of ~ 40 days in 1999; this pattern of westward progression is clear for most years (except for 2000).  The time delay appears to be greater in some years (depicted as the solid lines in Fig. 2) than others (dashed lines), which we believe is related to the intensity of freshening in different years. 

The interannual variation of TSPB for seven zones is presented in the following figure (top panel). For Zones 1 to 4 (solid lines), the blooms occurred with a consistent zigzag pattern in TSPB: relatively earlier in 1998-99, somewhat later in 2000 and 2001, earlier in the season again in 2002, followed by later blooms in 2003 and 2004, and then earlier again in 2005 and 2006. This pattern in timing is more obvious farther upstream (Zones 1 and 2).  Such a temporal zigzag pattern appears to be consistent with the interannual variability of SSS anomalies computed for the eastern GoM (used as a proxy for the intensity of freshening throughout the study domain;  bottom panel of the following figure).


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Last updated July 10, 2008
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