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Volcanic ash fuels anomalous plankton bloom in subarctic northeast Pacific
Hamme, R.C.; Webley, P.W.; Crawford, W.R.; Whitney, F.A.; DeGrandpre, M.D.; Emerson, S.R.; Eriksen, C.C.; Giesbrecht, K.E.; Gower, J.F.R.; Kavanaugh, M.T.; Peña, M.A.; Sabine, C.L.; Batten, S.D.; Coogan, L.A.; Grundle, D.S.; Lockwood, D. (2010). Volcanic ash fuels anomalous plankton bloom in subarctic northeast Pacific. Geophys. Res. Lett. 37(19): L19604. https://dx.doi.org/10.1029/2010gl044629
In: Geophysical Research Letters. American Geophysical Union: Washington. ISSN 0094-8276; e-ISSN 1944-8007, more
Peer reviewed article  

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Authors  Top 
  • Hamme, R.C.
  • Webley, P.W.
  • Crawford, W.R.
  • Whitney, F.A.
  • DeGrandpre, M.D.
  • Emerson, S.R.
  • Eriksen, C.C.
  • Giesbrecht, K.E.
  • Gower, J.F.R.
  • Kavanaugh, M.T.
  • Peña, M.A.
  • Sabine, C.L.
  • Batten, S.D.
  • Coogan, L.A.
  • Grundle, D.S.
  • Lockwood, D.

Abstract
    Using multiple lines of evidence, we demonstrate that volcanic ash deposition in August 2008 initiated one of the largest phytoplankton blooms observed in the subarctic North Pacific. Unusually widespread transport from a volcanic eruption in the Aleutian Islands, Alaska deposited ash over much of the subarctic NE Pacific, followed by large increases in satellite chlorophyll. Surface ocean pCO2, pH, and fluorescence reveal that the bloom started a few days after ashfall. Ship‐based measurements showed increased dominance by diatoms. This evidence points toward fertilization of this normally iron‐limited region by ash, a relatively new mechanism proposed for iron supply to the ocean. The observations do not support other possible mechanisms. Extrapolation of the pCO2 data to the area of the bloom suggests a modest ∼0.01 Pg carbon export from this event, implying that even large‐scale iron fertilization at an optimum time of year is not very efficient at sequestering atmospheric CO2.

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