Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 5 3 2008 10.5194/bg-5-891-2008 http://www.biogeosciences.net/5/891/2008/ http://www.biogeosciences.net/5/891/2008/bg-5-891-2008.html http://www.biogeosciences.net/5/891/2008/bg-5-891-2008.pdf 891 911 2008-06-02 Predicting the global distribution of planktonic foraminifera using a dynamic ecosystem model I. Fraile igaratza@palmod.uni-bremen.de M. Schulz S. Mulitza M. Kucera Faculty of Geosciences, University of Bremen, P.O. Box 330440, 28334 Bremen, Germany MARUM – Center For Marine Environmental Sciences, University of Bremen, P.O. Box 330440, 28334 Bremen, Germany Institute of Geosciences, Eberhard Karls University of Tübingen, Sigwartstrasse 10, 72076 Tübingen, Germany 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. 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