Volcanic ash fuels anomalous plankton bloom in subarctic northeast Pacific

Type : ACL
Nature : Production scientifique
Au bénéfice du Laboratoire : Non
Statut de publication : Publié
Année de publication : 2010
Auteurs (16) : HAMME Roberta,c WEBLEY Pw CRAWFORD W,r WHITNEY F,a DEGRANDPRE M,d EMERSON S,r ERIKSEN C GIESBRECHT K,e GOWER J,f,r KAVANAUGH Maria PENA M,a SABINE C,l BATTEN Sonia COOGAN L,a GRUNDLE Damian,s LOCKWOOD D
Revue scientifique : Geophysical Research Letters
Volume : 37
Fascicule :
Pages :
DOI : 10.1029/2010GL044629
URL : -
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 pCO(2), 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 similar to 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 CO(2). Citation: Hamme, R. C., et al. (2010), Volcanic ash fuels anomalous plankton bloom in subarctic northeast Pacific, Geophys. Res. Lett., 37, L19604, doi:10.1029/2010GL044629.
Mots-clés : DYNAMICS; IRON; NE; NUTRIENT; PHYTOPLANKTON; SURFACE OCEAN; VARIABILITY
Commentaire : Times Cited in Web of Science Core Collection: 157
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Citation :
Hamme RC, Webley P, Crawford WR, Whitney FA, DeGrandpre MD, Emerson SR, Eriksen C, Giesbrecht KE, Gower JFR, Kavanaugh M, Pena MA, Sabine CL, Batten S, Coogan LA, Grundle DS, Lockwood D (2010) Volcanic ash fuels anomalous plankton bloom in subarctic northeast Pacific. Geophys Res Lett 37 | doi: 10.1029/2010GL044629