  Irregular sampling is a common problem in palaeoclimate studies. We propose a
method that provides regularly sampled time series and at the same time a
difference filtering of the data. The differences between successive time
instances are derived by a transformation costs procedure. A subsequent
recurrence analysis is used to investigate regime transitions. This approach is
applied on speleothem based palaeoclimate proxy data from the
Indonesian-Australian monsoon region. We can clearly identify Heinrich events
in the palaeoclimate as characteristic changes in the dynamics.
