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| Titel |
Sulphur compounds, methane, and phytoplankton: interactions along a north–south transit in the western Pacific Ocean |
| VerfasserIn |
C. Zindler, A. Bracher, C. A. Marandino, B. Taylor, E. Torrecilla, A. Kock, H. W. Bange |
| 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. 5 ; Nr. 10, no. 5 (2013-05-16), S.3297-3311 |
| Datensatznummer |
250018252
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| Publikation (Nr.) |
 copernicus.org/bg-10-3297-2013.pdf |
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| Zusammenfassung |
| Here we present results of the first comprehensive study of sulphur compounds
and methane in the oligotrophic tropical western Pacific Ocean. The
concentrations of dimethylsuphide (DMS), dimethylsulphoniopropionate (DMSP),
dimethylsulphoxide (DMSO), and methane (CH4), as well as various
phytoplankton marker pigments in the surface ocean were measured along a
north–south transit from Japan to Australia in October 2009. DMS
(0.9 nmol L−1), dissolved DMSP (DMSPd, 1.6 nmol L−1)
and particulate DMSP (DMSPp, 2 nmol L−1) concentrations were
generally low, while dissolved DMSO (DMSOd, 4.4 nmol L−1)
and particulate DMSO (DMSOp, 11.5 nmol L−1) concentrations
were comparably enhanced. Positive correlations were found between DMSO and
DMSP as well as DMSP and DMSO with chlorophyll a, which suggests a similar
source for both compounds. Similar phytoplankton groups were identified as
being important for the DMSO and DMSP pool, thus, the same algae taxa might
produce both DMSP and DMSO. In contrast, phytoplankton seemed to play only a
minor role for the DMS distribution in the western Pacific Ocean. The
observed DMSPp : DMSOp ratios were very low and seem to
be characteristic of oligotrophic tropical waters representing the extreme
endpoint of the global DMSPp : DMSOp ratio vs SST
relationship. It is most likely that nutrient limitation and oxidative stress
in the tropical western Pacific Ocean triggered enhanced DMSO production leading
to an accumulation of DMSO in the sea surface. Positive correlations between
DMSPd and CH4, as well as between DMSO (particulate and total)
and CH4, were found along the transit. We conclude that DMSP and DMSO
and/or their degradation products might serve as potential substrates for
CH4 production in the oxic surface layer of the western Pacific Ocean. |
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