‘Mega-bloom’ of tiny plants under Arctic sea ice tied to climate change- largest ever seen on the planet

June 8, 2012 – ARCTIC – Experts were shocked to find a thick, 60-mile-long “phytoplankton mega-bloom” under Arctic sea ice, announcing in a study Thursday that ice made thinner by warming temperatures has, for now at least, created ideal conditions for the microscopic, single-cell plants to flourish. More blooms are likely hidden under the ice, making for “ecological shifts” in Arctic waters that favor some species over others since phytoplankton are the base of the marine food chain, Stanford professor and lead researcher Kevin Arrigo told msnbc.com. Scientists had thought Arctic phytoplankton blooms only happened after sea ice melted in summer, so the discovery is “like finding the Amazon rainforest in the middle of the Mojave Desert,” added Paula Bontempi, who manages the ocean biology program at NASA, which funded the research. The waters literally looked like pea soup,” Arrigo said at a press conference announcing the study in the journal Science. “It was as thick as a 5-year-old child is tall.” The team discovered the bloom in July 2011 in thin sea ice pocketed with ponds of melted ice on the Chukchi Sea off northern Alaska. Arctic sea ice has been shrinking and thinning in summer since 1979, the result of warming temperatures over the region. Those melt ponds proved crucial, allowing just enough light to get the growth process started while also protecting the algae from ultraviolet radiation. Arrigo said in his 25 years of studying phytoplankton blooms he had never seen one this large. Blooms in open water are much smaller, he noted, while very thick ice won’t allow any light in to start photosynthesis. “It’s going to be a more productive system,” Arrigo said, noting that plankton bottom feeders will benefit as the plankton sinks to the bottom of the Chukchi, much of which is around 160 feet deep. –MSNBC

contribution by Ronni