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| Titel |
Carbon export and sequestration in the southern Benguela upwelling system: lower and upper estimates |
| VerfasserIn |
H. N. Waldron, P. M. S. Monteiro, N. C. Swart |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 5, no. 4 ; Nr. 5, no. 4 (2009-12-18), S.711-718 |
| Datensatznummer |
250002742
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| Publikation (Nr.) |
 copernicus.org/os-5-711-2009.pdf |
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| Zusammenfassung |
| Three independent studies of carbon export and sequestration in the southern
Benguela upwelling system are presented. They were undertaken by Waldron
(upwelling index), Monteiro (discrete upwelling centres – gate hypothesis
model) and Swart (cross-shelf advection in bottom nelpheloid layers). The
annual estimates were, 3.9×1013, 0.72×1013 and 8.6×1011 gC, respectively.
The lowest estimate was derived from a consideration of
low frequency lateral carbon export in the bottom nepheloid layer and was
thought likely to be an under-estimate. Taking into account high frequency
episodic events, intermediate nepheloid layers and along isopycnal export of
DOC at surface and intermediate depths was thought likely to result in a
substantial upward revision. The remaining two estimates were considered to
be an upper and lower estimate of carbon export and sequestration due to
factors inherent in the methodologies. The upper estimate presents a
two-dimensional system, integrated alongshore; the lower estimate sums a
series of upwelling centres in order to obtain a system flux. The former is
therefore a uniform extrapolation along the coast while the latter omits
upwelling between the upwelling centres. |
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