Fall 2014 Update: Spring Bloom Start Day and Magnitude
The spring bloom typically starts earlier in the more southern segments of the Northeast Shelf LME. In 2014, the Northeast Shelf composite bloom start was mid-March, which was consistent with the bloom start on Georges Bank and earlier than the start date for the Scotian shelf which was the first week of April. Since blooms were not detected in the Gulf of Maine or Middle Atlantic Bight, no start dates are estimated. Spring bloom magnitude is one measure of bloom dimension and is calculated as the sum of chlorophyll concentrations during the bloom period. For the areas with detected blooms, the Georges Bank bloom had a slightly above average bloom magnitude whereas the Scotian Shelf bloom was smallest magnitude bloom detected in the region time series. This analysis was based on a blended time series of MODIS and SeaWiFS remote sensing data that utilized a time and area correction between the two sensors.