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Reconstructing Sea Surface Salinity for the last 25 kyr in the Western Mediterranean from a coccolithophore-based Transfer Function

AuthorsAusín, Blanca; Flores, José Abel; Sierro, Francisco Javier; Hernández-Almeida, Iván; Grosjean, M.; Francés, G.; Alonso, Belén
Issue Date12-Mar-2015
PublisherInternational Nannoplankton Association
Citation15th International Nannoplankton Association Meeting (2015)
AbstractIn order to quantify the relationship between coccolithophore species assemblages in the Western Mediterranean Sea and the modern environment conditions, a new dataset of 89 surface sediment samples and related environmental variables (temperature, salinity, chlorophyll-a, oxygen, etc.) was created. Multivariate statistics analyses revealed that the sampling sites were primarily distributed along the Sea Surface Salinity (SSS) gradient, and that this variable explains an independent proportion of variance in the coccolithophore data. A quantitative transfer function was then developed to estimate salinity from modern coccolithophoreassemblages using the Modern AnalogueTechnique (MAT) and weighted-averaging partial-least square regression (WA-PLS). The bootstrapped regression coefficient (Boot_R2) was 0.89 MAT and 0.81 WA-PLS, with a root-mean square error of prediction (RMSEP) of 0.26 MAT and 0.29 WA-PLS (‰). To date, no coccolithophore-based transfer function has been implemented in the Mediterranean Sea. This new information on coccolithophore species salinity preferences provides a useful tool for quantitatively reconstructing SSS changes over time. The resulting transfer function wasapplied to fossil coccolithophore assemblages from a sediment core in the Alboran Sea (CEUTA10PC08, 36°1’22’’N, 4°52’3’’W) to reconstruct SSS for the last 25 kyr. The reliability of the reconstruction was evaluated through comparison with other published SSS records from nearby cores. Decreased salinity during the stadials associated to Heinrich Events 2 and 1 were related to melt-water pulses from the North Atlantic. SSS increased during the Last Glacial Maximum, likely due to a limited Atlantic-Mediterranean connection, although lower SSS values suggest wetter conditions from 21 to 18.5 ka. Increased rainfall as deduced for the Bølling-Allerød, while a transition from more to less SSS is seen for the Younger Dryas. During the Holocene, SSS decreasing trend was linked tothe increasing sea-level and/or to the African Humid Period (11-5.5 ka)
Description15th International Nannoplankton Association Meeting, 7-16 March 2015, Bohol, Philippines
Publisher version (URL)http://www.ina15.upd.edu.ph/
Appears in Collections:(ICM) Comunicaciones congresos
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