From NASA’s Earth Observatory website here’s a zoomed-in pic of a recent phytoplankton bloom off the west coast.
‘Late May 2010 brought peacock-hued swirls of blue and green to the North Atlantic. The iridescent waters formed a giant arc hundreds of kilometers across, extending from west of Ireland to the Bay of Biscay. The Moderate Resolution Imaging Spectroradiometer on NASA’s Terra satellite captured this natural-color image on May 22, 2010. The vibrant colors are from tiny organisms, phytoplankton, that grow explosively in the North Atlantic—from Iceland to the shores of France—in the spring and summer.’
A complete image can be viewed here on NASA’s website.