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Unusual Chlorophyll Pattern Off New Zealand

The spring bloom is underway in the South Pacific Ocean around New Zealand. Patchiness is common in phytoplankton distributions, but the small, high-chlorophyll patches to the east of the North Island struck this writer as noteworthy because they appear different from the distributions I am used to seeing. I wonder what sort of plankton makes those patches?

Move your pointer over the above Suomi-NPP/VIIRS image to just display relative chlorophyll concentration in gray scale (the brighter the pixels, the higher the chlorophyll). Click on the image to download a larger version of the enhanced-color image.