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Creator |
d8b4bad32e975f1f1e93a4020d9115c4 |
| 41830 |
Creator |
21bbfae4d4dc92426d96f0c043545285 |
| 41830 |
Creator |
777eedacb38a41636200990f73ab1858 |
| 41830 |
Creator |
ext-357792ef8af0e2577e6f19ac3071cf6a |
| 41830 |
Date |
2015-01-13 |
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Is Part Of |
repository |
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Is Part Of |
p17264189 |
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abstract |
Oligotrophic regions represent up to 75% of Earth's open-ocean environments. They
are thus areas of major importance in understanding the plankton community dynamics
and biogeochemical fluxes. Here we present fluxes of total planktonic foraminifera
and 11 planktonic foraminifer species measured at the Oceanic Flux Program (OFP) time
series site in the oligotrophic Sargasso Sea, subtropical western North Atlantic Ocean.
Foraminifera flux was measured at 1500 m water depth, over two ~ 2.5-year intervals:
1998–2000 and 2007–2010. We find that foraminifera flux was closely correlated with
total mass flux, carbonate and organic carbon fluxes. We show that the planktonic
foraminifera flux increases approximately 5-fold during the winter–spring, contributing
up to ~ 40% of the total carbonate flux. This was primarily driven by increased fluxes
of deeper-dwelling globorotaliid species, which contributed up to 90% of the foraminiferal-derived
carbonate during late winter–early spring. Interannual variability in total foraminifera
flux, and in particular fluxes of the deep-dwelling species (<i>Globorotalia truncatulinoides,
Globorotalia hirsuta</i> and <i>Globorotalia inflata</i>), was related to differences
in seasonal mixed layer dynamics affecting the strength of the spring phytoplankton
bloom and export flux, and by the passage of mesoscale eddies. As these heavily calcified,
dense carbonate tests of deeper-dwelling species (3 times denser than surface dwellers)
have greater sinking rates, this implies a high seasonality of the biological carbonate
pump in oligotrophic oceanic regions. Our data suggest that climate cycles, such as
the North Atlantic Oscillation, which modulates nutrient supply into the euphotic
zone and the strength of the spring bloom, may also in turn modulate the production
and flux of these heavily calcified deep-dwelling foraminifera by increasing their
food supply, thereby intensifying the biological carbonate pump. |
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authorList |
authors |
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issue |
1 |
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status |
peerReviewed |
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uri |
http://data.open.ac.uk/oro/document/280944 |
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uri |
http://data.open.ac.uk/oro/document/280975 |
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uri |
http://data.open.ac.uk/oro/document/280976 |
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uri |
http://data.open.ac.uk/oro/document/280977 |
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uri |
http://data.open.ac.uk/oro/document/280978 |
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uri |
http://data.open.ac.uk/oro/document/280979 |
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uri |
http://data.open.ac.uk/oro/document/282960 |
| 41830 |
volume |
12 |
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type |
AcademicArticle |
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type |
Article |
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label |
Salmon, K. H. ; Anand, P. ; Sexton, P. F. and Conte, M. (2015). Upper ocean mixing
controls the seasonality of planktonic foraminifer fluxes and associated strength
of the carbonate pump in the oligotrophic North Atlantic. Biogeosciences, 12(1) pp.
223–235. |
| 41830 |
label |
Salmon, K. H. ; Anand, P. ; Sexton, P. F. and Conte, M. (2015). Upper ocean mixing
controls the seasonality of planktonic foraminifer fluxes and associated strength
of the carbonate pump in the oligotrophic North Atlantic. Biogeosciences, 12(1) pp.
223–235. |
| 41830 |
Title |
Upper ocean mixing controls the seasonality of planktonic foraminifer fluxes and associated
strength of the carbonate pump in the oligotrophic North Atlantic |
| 41830 |
in dataset |
oro |