 |
| Titel |
Predicting the global distribution of planktonic foraminifera using a dynamic ecosystem model |
| VerfasserIn |
I. Fraile, M. Schulz, S. Mulitza, M. Kucera |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1726-4170
|
| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 5, no. 3 ; Nr. 5, no. 3 (2008-06-02), S.891-911 |
| Datensatznummer |
250002529
|
| Publikation (Nr.) |
 copernicus.org/bg-5-891-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
We present a new planktonic foraminifera model developed for the global ocean mixed-layer. The main purpose of the model is to explore the response
of planktonic foraminifera to different boundary conditions in the geological past, and to quantify
the seasonal bias in foraminifera-based paleoceanographic proxy records.
This model is forced with hydrographic data and with
biological information taken from an ecosystem model to predict monthly concentrations of the most common
planktonic foraminifera species used in paleoceanography: N. pachyderma
(sinistral and dextral varieties), G. bulloides, G. ruber
(white variety) and G. sacculifer. The sensitivity of each species
with respect to temperature (optimal temperature and range of tolerance) is
derived from previous sediment-trap studies.
Overall, the spatial distribution patterns of most of the species are
in agreement with core-top data. N. pachyderma (sin.) is limited to
polar regions, N. pachyderma (dex.) and G. bulloides are
the most common species in high productivity zones,
while G. ruber and G. sacculifer are more abundant in
tropical and subtropical oligotrophic waters. For
N. pachyderma (sin) and N. pachyderma (dex.),
the season of maximum production coincides with that observed in sediment-trap records.
Model and sediment-trap data for G. ruber and G. sacculifer show, in
general, lower concentrations and less seasonal variability at all sites. A sensitivity experiment suggest that,
within the temperature-tolerance range of a species, food availability may be the main
parameter controlling its abundance. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|