Category Archives: transfer function

Chironomids are cunning wee beasties

Since I had examined almost every aspect of the data from the remarkable Lake Żabińskie chironomid-inferred August air temperature reconstruction, some time last summer I thought that I would, for completeness, have a quick look at the instrumental temperature data. … Continue reading

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A mean wind blows over Lake Żabińskie

I have largely neglected the chrysophyte-inferred reconstructions of winter severity and summer calcium concentrations/zonal wind speed from Lake Żabińskie even though they fall within the scope of my review of sub-decadal resolution reconstructions. This is not because I think this … Continue reading

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Pollen from the garden of forking paths

Most transfer functions for reconstructing past environmental changes are based on a calibration-in-space approach, with a modern calibration set of paired microfossil assemblages and environmental data. The alternative approach is calibration-in-time, with well-dated fossil assemblages and contemporaneous environmental data. I’ve … Continue reading

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The third chironomid calibration-in-time reconstruction

Most reconstructions of past environmental conditions derived from chironomid assemblages with transfer functions use a calibration-in-space approach, in which the calibration is a set of modern chironomid assemblages paired with modern environmental data. I am aware of three chironomid calibration-in-time … Continue reading

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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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