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| Titel |
The ocean response to volcanic iron fertilisation after the eruption of Kasatochi volcano: a regional-scale biogeochemical ocean model study |
| VerfasserIn |
A. Lindenthal, B. Langmann, J. Pätsch, I. Lorkowski, M. Hort |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 6 ; Nr. 10, no. 6 (2013-06-05), S.3715-3729 |
| Datensatznummer |
250018280
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| Publikation (Nr.) |
 copernicus.org/bg-10-3715-2013.pdf |
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| Zusammenfassung |
| In high-nutrient–low-chlorophyll regions, phytoplankton growth is limited by
the availability of water-soluble iron. The eruption of Kasatochi volcano in
August 2008 led to ash deposition into the iron-limited NE Pacific Ocean.
Volcanic ash released iron upon contact with seawater and generated a
massive phytoplankton bloom. Here we investigate this event with a
one-dimensional ocean biogeochemical column model to illuminate the ocean
response to iron fertilisation by volcanic ash. The results indicate that
the added iron triggered a phytoplankton bloom in the summer of 2008.
Associated with this bloom, macronutrient concentrations such as nitrate and
silicate decline and zooplankton biomass is enhanced in the ocean mixed
layer. The simulated development of the drawdown of carbon dioxide and
increase of pH in surface seawater is in good agreement with available
observations. Sensitivity studies with different supply dates of iron to the
ocean emphasise the favourable oceanic conditions in the NE Pacific to
generate massive phytoplankton blooms in particular during July and August
in comparison to other months. By varying the amount of volcanic ash and
associated bio-available iron supplied to the ocean, model results
demonstrate that the NE Pacific Ocean has higher, but limited capabilities
to consume CO2 after iron fertilisation than those observed after the
volcanic eruption of Kasatochi. |
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