Kucera, Milan

Lopes, Cristina Isabel

Mix, Alan C.

Repositório do LNEG

Home Page | Help | Contact | Log In | Search | Follow us:  Lopes, C. ., LNEG, Lisbon, Portugal, cristina.lopes@lneg.ptMix, A. C., OSU, Corvallis, USA,Kucera, M. ., Universität Tübingen, Tübingen, Germany, michal.kucera@uni-tuebingen.deHIGH PRIMARY PRODUCTIVITY IN THE NORTHEAST PACIFIC DURING THE LAST GLACIALMAXIMUM INDICATED BY DIATOM TRANSFER FUNCTIONSMaximum Likelihood transfer functions applied to modern calibrations from NE Pacific reveals significant relations between diatomsand oceanic annual productivity. The existence of no-analog lead us to test this transfer function not only with independent methodssuch as Artificial Neural Networks but also by comparing the no-analogs removal. The reconstructions using both approaches and theremoval of no-analogs show similar results and have the same trends. Results show that during the Last Glacial Maximum, annualproductivity was higher by 1.5 to 2 times than modern days, despite the suppression of coastal upwelling. Comparison of our resultswith previous data of organic carbon and carbonate mass accumulation rates and percentages, shows that although the ecosystem wasproductive, it was less efficient in exporting organic carbon. The results presented here are the first approach considering quantitativereconstructions of oceanic productivity in this area. Possible sources for the nutrients needed to support such system can be therecycling in the water column, the freshwater inputs, the increase of open ocean upwelling, enhancement of southern currents and/or amixture of all the previous.Poster presentationSession #:122Date: 2/23/2012Time: 14:00 - 16:00Location: Poster/Exhibit HallPresentation is given by student: NoPosterID: B1310Back1 of 1

High primary productivity in the Northeast Pacific during the Last Glacial Maximum indicated by diatom transfer functions

Laboratório Nacional de Energia e Geologia Repository

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High primary productivity in the Northeast Pacific during the Last Glacial Maximum indicated by diatom transfer functions

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