Category Archives: Palaeohydrology

Autocorrelation in the testate amoeba calibration set

Amesbury et al examine the autocorrelation in their huge calibration set. I thought I would do the same, increasing the resolution of the analysis to get a better handle on what is going on. This is an RNE plot. It … Continue reading

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Testing testate amoeba: some comments on Amesbury et al (2018)

Today, I have been reading and thinking about a new paper presenting a huge testate-amoeba calibration set for reconstructing water table depth in bogs (Amesbury et al 2018). This calibration set, with almost 2000 samples, is the synthesis of many … Continue reading

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The elevation of Lake Tilo

For my PhD, I studied the palaeolimnology of two lakes in the Ethiopian rift valley, using diatoms to reconstruct changes in the water chemistry of Lake Awassa, an oligosaline caldera lake which retains its low salinity despite having no effluent … Continue reading

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Significance testing testate amoeba water table reconstructions

Testate amoeba live in bogs, their shell or test is preserved in the peat after death. Some species seem to prefer drier conditions, others prefer wetter conditions. And thus we have the prerequisites for constructing a transfer function to reconstruct … Continue reading

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You don’t have to explain everything

So many papers present interesting palaeo-data and then add a badly done analysis that attempts to prove that the palaeo-data correlate (if you squint hard enough) with the Carriaco Basin record, NGRIP or the solar insolation reconstruction. This is not … Continue reading

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On the niche of Thalassiosira faurii, perils in palaeoecology

Palaeoenvironmental conditions can be reconstructed from microfossils preserved in sediments using the relationship between species and the environment. Usually the species’ relationships with the environment — their niches — are insufficiently constrained by experimental data, so we are forced to rely upon observations of … Continue reading

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Mayfly mandibles: as seen in the IPCC report

I have been reading through the palaeoclimate chapter in the new IPCC report, in part so I can write a post on transfer functions in the report for Victor Venema’s climate scientists’ reviews. This post is not that review, instead I want … Continue reading

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