Pyleoclim

Analyse proxy variability while retaining the chronology and sampling assumptions. Version 1.3.0 requires Python 3.12 or newer; use an isolated environment.

Inputs and method selection

Establish the proxy units, archive type, time direction and origin: years CE, years before 1950 and ka BP are different coordinate systems. Record missing values, duplicate times and age uncertainties before sorting or removing rows. Do not interpolate across hiatuses silently. A proxy is not automatically a calibrated temperature or precipitation observation.

Use Lomb–Scargle for an explicitly retained irregular chronology; use methods requiring regular sampling only after justified resampling and sensitivity checks. Compare spectral peaks with an appropriate autocorrelated null model, sampling window and multiple-testing policy. Power alone is not a significance level.

Irregular synthetic series