Package that allows to derive palaeo-air temperature characteristics associated with relict periglacial features indicative of the palaeo-active-layer thickness.
The package consists of two alternate schemes deriving past air temperature conditions that differ in how they define the magnitude of annual air temperature oscillations, but both provide identical outcomes if driven with compatible data.
Aa
utilizes the air temperature range (Aa), that is, the difference between the mean air temperature of the warmest and coldest month, to define the magnitude of annual air temperature oscillations.
MATWM
utilizes the mean air temperature of the warmest month (MATWM), or rather its difference from the mean annual air temperature, to define the magnitude of annual air temperature oscillations.
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