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Browsing by Author "Mix, Alan"

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  • ForCenS-LGM: a dataset of planktonic foraminifera species assemblage composition for the last glacial maximum
    Publication . Jonkers, Lukas; Mix, Alan; Voelker, Antje; Risebrobakken, Bjørg; Smart, Christopher W.; Ivanova, Elena; Arellano-Torres, Elsa; Eynaud, Frédérique; Naoufel, Haddam; Max, Lars; Rossignol, Linda; Simon, Margit H.; Martins, Maria Virgínia Alves; Petró, Sandro; Caley, Thibaut; Dokken, Trond; Howard, Will; Kucera, Michal
    Species assemblage composition of marine microfossils offers the possibility to investigate ecological and climatological change on time scales inaccessible using conventional observations. Planktonic foraminifera - calcareous zooplankton - have an excellent fossil record and are used extensively in palaeoecology and palaeoceanography. During the Last Glacial Maximum (LGM; 19,000 - 23,000 years ago), the climate was in a radically different state. This period is therefore a key target to investigate climate and biodiversity under different conditions than today. Studying LGM climate and ecosystems indeed has a long history, yet the most recent global synthesis of planktonic foraminifera assemblage composition is now nearly two decades old. Here we present the ForCenS-LGM dataset with 2,365 species assemblage samples collected using standardised methods and with harmonised taxonomy. The data originate from marine sediments from 664 sites and present a more than 50% increase in coverage compared to previous work. The taxonomy is compatible with the most recent global core top dataset, enabling direct investigation of temporal changes in foraminifera biogeography and facilitating seawater temperature reconstructions.
    2024Journal article Open access Show more
  • A global synthesis of high-resolution stable isotope data from benthic foraminifera of the last deglaciation
    Publication . Muglia, Juan; Mulitza, Stefan; Repschläger, Janne; Schmittner, Andreas; Lembke-Jene, Lester; Lisiecki, Lorraine; Mix, Alan; Saraswat, Rajeev; Sikes, Elizabeth; Waelbroeck, Claire; Gottschalk, Julia; Lippold, Jörg; Lund, David; Martinez-Mendez, Gema; Michel, Elisabeth; Muschitiello, Francesco; Naik, Sushant; Okazaki, Yusuke; Stott, Lowell; Voelker, Antje; Zhao, Ning
    We present the first version of the Ocean Circulation and Carbon Cycling (OC3) working group database, of oxygen and carbon stable isotope ratios from benthic foraminifera in deep ocean sediment cores from the Last Glacial Maximum (LGM, 23-19 ky) to the Holocene (<10 ky) with a particular focus on the early last deglaciation (19-15 ky BP). It includes 287 globally distributed coring sites, with metadata, isotopic and chronostratigraphic information, and age models. A quality check was performed for all data and age models, and sites with at least millennial resolution were preferred. Deep water mass structure as well as differences between the early deglaciation and LGM are captured by the data, even though its coverage is still sparse in many regions. We find high correlations among time series calculated with different age models at sites that allow such analysis. The database provides a useful dynamical approach to map physical and biogeochemical changes of the ocean throughout the last deglaciation.
    2023Journal article Open access Show more