Tag Archives: dinocysts

Perhaps the most depressing palaeoecology paper ever

Posted on 20/04/2014 by richard telford

One of the major rationales for palaeoecological analyses is to provide data that can be used to validate climate models — if the models can predict past climate from periods with different climate forcings our confidence in their projections of future climate … Continue reading →

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Effect of incomplete sampling of environmental space on transfer functions

Posted on 11/02/2014 by richard telford

When I wrote a requiem for the dinocyst-salinity transfer function, one of the issues I raised was the effect of incomplete sampling of environmental space such that transfer functions were forced to interpolate (extrapolation I’ve examined elsewhere). I raised the … Continue reading →

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In agreement with anonymous referee #2

Posted on 04/02/2014 by richard telford

The peer review process at most Copernicus journals, though alas not the late lamentable Pattern Recognition in Physics, has several unusual, perhaps unique, features. After a quick technical check, the submitted manuscript is immediately published online. This is very handy … Continue reading →

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Dinocysts reconstructions vs. climate models

Posted on 03/01/2014 by richard telford

The potential for using palaeoclimate reconstructions to validate climate models is a popular argument in proposals for funding research – if models can accurately predict past climate, our confidence in their ability to predict future climate should be enhanced. Klein … Continue reading →

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Requiem for a transfer function

Posted on 18/11/2013 by richard telford

Organic walled dinocysts, the resting stage of some dinoflagellate species, were a promising microfossil group for reconstructing past environmental conditions based on the relationship between the modern environment and dinocyst assemblages in modern sediment. The cysts are resistant to the … Continue reading →

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Status of palaeoceanographic transfer functions

Posted on 02/10/2013 by richard telford

A wide variety of microfossil groups have been used to generate quantitative reconstructions of palaeoceanographic conditions. This post lists the species groups used, the variables reconstructed with them, with some comments on the availability of the data. This list is … Continue reading →

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Independent adventures in uncertainty: sea-ice reconstructions

Posted on 18/08/2013 by richard telford

One of the assumptions of transfer functions is that the calibration set observations are independent. If they are not independent of each other, for example because of spatial autocorrelation, the transfer function performance statistics will be biased, appearing to be … Continue reading →

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Uneven adventures in uncertainty: sea-ice reconstructions

Posted on 18/08/2013 by richard telford

The dinocyst calibration set has an extremely uneven distribution of sites along the sea-ice gradient. In the 1171-observation calibration set (the latest 1492-observation calibration set is not yet online), just over half the sites have zero sea-ice, so the remainder of the … Continue reading →

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Dinocysts and autocorrelation redux: Guiot and de Vernal’s (2011) reply

Posted on 15/08/2013 by richard telford

I was alerted to Guiot and de Vernal (2011; GdV11) by Google Reader one morning while reading in bed and I drafted a rejoinder before I got up.  Unfortunately not all mornings are that productive, but fortunately I don’t read many … Continue reading →

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My autocorrelation papers

Posted on 14/08/2013 by richard telford

I’m making the papers I have published about the effects of autocorrelation on transfer functions available below for easy reference.

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