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| Titel |
Development of coccolithophore-based transfer functions in the western Mediterranean sea: a sea surface salinity reconstruction for the last 15.5 kyr |
| VerfasserIn |
B. Ausín, I. Hernández-Almeida, J.-A. Flores, F.-J. Sierro, M. Grosjean, G. Francés, B. Alonso |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 11, no. 12 ; Nr. 11, no. 12 (2015-12-09), S.1635-1651 |
| Datensatznummer |
250117487
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| Publikation (Nr.) |
 copernicus.org/cp-11-1635-2015.pdf |
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| Zusammenfassung |
| A new data set of 88 marine surface sediment samples and related oceanic
environmental variables (temperature, salinity, chlorophyll a, oxygen,
etc.) was studied to quantify the relationship between assemblages of
coccolithophore species and modern environmental conditions in the western
Mediterranean Sea and the Atlantic Ocean, west of the Strait of Gibraltar.
Multivariate statistical analyses revealed that coccolithophore species were
primarily related to sea surface salinity (SSS), explaining an independent
and significant proportion of variance in the coccolithophore data. A
quantitative coccolithophore-based transfer function to estimate SSS was
developed using the modern analog technique (MAT) and weighted-averaging
partial least square regression (WA-PLS). The bootstrapped regression
coefficient (R2boot) was 0.85MAT
and 0.80WA-PLS, with a root-mean-square error of prediction (RMSEP) of 0.29MAT and
0.30WA-PLS (psu). The resulting transfer function was applied to fossil
coccolithophore assemblages in the highly resolved (~ 65 years) sediment
core CEUTA10PC08 from the Alboran Sea (western Mediterranean) in order to
reconstruct SSS for the last 25 kyr. The reliability of the reconstruction
was evaluated by assessing the degree of similarity between fossil and modern
coccolithophore assemblages and by a comparison of reconstructions with fossil
ordination scores. Analogs were poor for the stadials associated with
Heinrich events 2 and 1 and part of the Last Glacial Maximum. Good analogs
indicate a more reliable reconstruction of the SSS for the last 15.5 kyr.
During this period, several millennial and centennial SSS changes were
observed and associated with sea-level oscillations and variations in the
Atlantic Water entering the Alboran. |
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