Category Archives: transfer function

Warm summers in the Younger Dryas?

The Younger Dryas was a period (12,900–11,600 BP) towards the end of the last glaciation when glaciers re-advanced in Scotland and the tundra plants, including the eponymous Dryas, replaced the Bølling-Allerød forests in Denmark. These changes indicate the Younger Dryas was … Continue reading

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Finding singletons in real data

I have argued that the rarest species in an assemblage should typically be represented by a single individual, and that this can be used to estimate the count sum when this is not reported. Now I want to test this … Continue reading

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A paper with insufficient and misleading information

Sometimes papers reporting transfer functions don’t give enough information for the reader to properly evaluate the model. Take for example Massaferro and Larocque-Tobler (2013) who report a chironomid-based mean annual air temperature transfer function for Patagonia and its application to … Continue reading

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Reviews are in

An email this evening informs me that the reviews of my manuscript discussing the challenges of validating reconstructions derived from microfossil assemblages with instrumental data, and the particular problems with several chironomid-based reconstructions, are now ready. But since I wish … Continue reading

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Seebergsee, Hamlet and the monkey

In my previous post, I showed that the calibration-in-time reconstruction from Seebergsee by Larocque-Tobler et al (2011) had not been cross-validated, and that once it had been cross-validated, the performance was terrible. Now it is time to look a little … Continue reading

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Calibration-in-time at Seebergsee

Most transfer functions for reconstructing palaeoenvironmental variables from microfossil assemblages use a modern calibration set of paired microfossil and environmental data from many sites. This is sometimes known as the calibration-in-space approach. An alternative approach adopted by a few papers … Continue reading

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Abisko, 2003

In the summer of 2003, our first summer in Bergen, Cathy and I took a grand tour of Scandinavia on the way to the Paleolimnology Symposium in Espoo. On the way, we stopped in Abisko, northern Sweden, for a few … Continue reading

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