Climate change is stirring life in the Arctic Ocean as thinning sea ice lets in more sunlight, allowing microscopic algae to bloom in the inhospitable region around the North Pole, scientists said on Wednesday.

The micro-algae may now be able to grow under the ice across almost 30 percent of the Arctic Ocean at the peak of the brief summer in July, up from about 5 percent 30 years ago, they wrote. Blooms may become even more widespread.

"Recent climate change may have markedly altered the ecology of the Arctic Ocean," wrote scientists in the United States and Britain led by Christopher Horvat of Harvard University.