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Volcano fuels massive phytoplankton bloom

October 7, 2010
University of Victoria
New study shows that 2008 volcano in North Pacific fueled largest phytoplankton bloom in the region since satellite measurements began in 1997. This study has important implications for proposals to seed the oceans with iron to reduce atmospheric carbon dioxide.

Ash cloud (2008).
Credit: Image courtesy of University of Victoria

Advocates for seeding regions of the ocean with iron to combat global warming should be interested in a new study published October 6 in Geophysical Research Letters. A Canada-US team led by University of Victoria oceanographer Dr. Roberta Hamme describes how the 2008 eruption of the Kasatochi volcano in the Aleutian Islands spewed iron-laden ash over a large swath of the North Pacific. The result, says Hamme, was an "ocean productivity event of unprecedented magnitude" -- the largest phytoplankton bloom detected in the region since ocean surface measurements by satellite began in 1997.

Phytoplankton are free-floating, single-celled plants that form the base of the marine food chain. They take up carbon dioxide (CO2) to grow, which is why seeding key regions of the ocean with iron has been proposed as one way to offset increasing atmospheric CO2 concentrations.

But although the volcanic ash fueled such a massive phytoplankton bloom, it resulted in only a "modest" uptake of atmospheric CO2, says Hamme. "The event acts as an example of the necessary scale that purposeful iron fertilizations would need to be to have an impact on global atmospheric CO2 levels."

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Journal Reference:

  1. Roberta C. Hamme, Peter W. Webley, William R. Crawford, Frank A. Whitney, Michael D. DeGrandpre, Steven R. Emerson, Charles C. Eriksen, Karina E. Giesbrecht, Jim F. R. Gower, Maria T. Kavanaugh, M. Angelica Pe?a, Christopher L. Sabine, Sonia D. Batten, Laurence A. Coogan, Damian S. Grundle, Deirdre Lockwood. Volcanic ash fuels anomalous plankton bloom in subarctic northeast Pacific. Geophysical Research Letters, 2010; 37 (19) DOI: 10.1029/2010GL044629

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University of Victoria. "Volcano fuels massive phytoplankton bloom." ScienceDaily. ScienceDaily, 7 October 2010. <>.
University of Victoria. (2010, October 7). Volcano fuels massive phytoplankton bloom. ScienceDaily. Retrieved May 26, 2017 from
University of Victoria. "Volcano fuels massive phytoplankton bloom." ScienceDaily. (accessed May 26, 2017).